X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/646c4aebb22c4b60f71b7c30c2eedfa6328888f4..74dea0decfee896aa5197df82f3ffda65afb3aec:/src/common/image.cpp diff --git a/src/common/image.cpp b/src/common/image.cpp index d9f07d30b2..8c329c38f5 100644 --- a/src/common/image.cpp +++ b/src/common/image.cpp @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: image.cpp +// Name: src/common/image.cpp // Purpose: wxImage // Author: Robert Roebling // RCS-ID: $Id$ @@ -7,10 +7,6 @@ // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifdef __GNUG__ -#pragma implementation "image.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -18,31 +14,44 @@ #pragma hdrstop #endif -#include "wx/defs.h" - #if wxUSE_IMAGE #include "wx/image.h" -#include "wx/bitmap.h" -#include "wx/debug.h" -#include "wx/log.h" -#include "wx/app.h" + +#ifndef WX_PRECOMP + #include "wx/log.h" + #include "wx/hash.h" + #include "wx/utils.h" + #include "wx/math.h" + #include "wx/module.h" + #include "wx/palette.h" + #include "wx/intl.h" +#endif + #include "wx/filefn.h" #include "wx/wfstream.h" -#include "wx/intl.h" -#include "wx/module.h" -#include "wx/hash.h" -#include "wx/utils.h" +#include "wx/xpmdecod.h" // For memcpy #include -#include -#ifdef __SALFORDC__ - #undef FAR +// make the code compile with either wxFile*Stream or wxFFile*Stream: +#define HAS_FILE_STREAMS (wxUSE_STREAMS && (wxUSE_FILE || wxUSE_FFILE)) + +#if HAS_FILE_STREAMS + #if wxUSE_FFILE + typedef wxFFileInputStream wxImageFileInputStream; + typedef wxFFileOutputStream wxImageFileOutputStream; + #elif wxUSE_FILE + typedef wxFileInputStream wxImageFileInputStream; + typedef wxFileOutputStream wxImageFileOutputStream; + #endif // wxUSE_FILE/wxUSE_FFILE +#endif // HAS_FILE_STREAMS + +#if wxUSE_VARIANT +IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(wxImage,WXDLLEXPORT) #endif - //----------------------------------------------------------------------------- // wxImage //----------------------------------------------------------------------------- @@ -64,8 +73,13 @@ public: unsigned char *m_alpha; bool m_ok; + + // if true, m_data is pointer to static data and shouldn't be freed bool m_static; + // same as m_static but for m_alpha + bool m_staticAlpha; + #if wxUSE_PALETTE wxPalette m_palette; #endif // wxUSE_PALETTE @@ -89,15 +103,16 @@ wxImageRefData::wxImageRefData() m_hasMask = false; m_ok = false; - m_static = false; + m_static = + m_staticAlpha = false; } wxImageRefData::~wxImageRefData() { if ( !m_static ) free( m_data ); - - free(m_alpha); + if ( !m_staticAlpha ) + free( m_alpha ); } wxList wxImage::sm_handlers; @@ -106,14 +121,10 @@ wxImage wxNullImage; //----------------------------------------------------------------------------- -#define M_IMGDATA ((wxImageRefData *)m_refData) +#define M_IMGDATA wx_static_cast(wxImageRefData*, m_refData) IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject) -wxImage::wxImage() -{ -} - wxImage::wxImage( int width, int height, bool clear ) { Create( width, height, clear ); @@ -124,6 +135,11 @@ wxImage::wxImage( int width, int height, unsigned char* data, bool static_data ) Create( width, height, data, static_data ); } +wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data ) +{ + Create( width, height, data, alpha, static_data ); +} + wxImage::wxImage( const wxString& name, long type, int index ) { LoadFile( name, type, index ); @@ -146,15 +162,22 @@ wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index ) } #endif // wxUSE_STREAMS -wxImage::wxImage( const wxImage& image ) - : wxObject() +wxImage::wxImage(const char* const* xpmData) { - Ref(image); + Create(xpmData); } -wxImage::wxImage( const wxImage* image ) +bool wxImage::Create(const char* const* xpmData) { - if (image) Ref(*image); +#if wxUSE_XPM + UnRef(); + + wxXPMDecoder decoder; + (*this) = decoder.ReadData(xpmData); + return Ok(); +#else + return false; +#endif } bool wxImage::Create( int width, int height, bool clear ) @@ -197,27 +220,71 @@ bool wxImage::Create( int width, int height, unsigned char* data, bool static_da return true; } -void wxImage::Destroy() +bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data ) { UnRef(); + + wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") ); + + m_refData = new wxImageRefData(); + + M_IMGDATA->m_data = data; + M_IMGDATA->m_alpha = alpha; + M_IMGDATA->m_width = width; + M_IMGDATA->m_height = height; + M_IMGDATA->m_ok = true; + M_IMGDATA->m_static = static_data; + + return true; } -wxImage wxImage::Copy() const +void wxImage::Destroy() { - wxImage image; + UnRef(); +} - wxCHECK_MSG( Ok(), image, wxT("invalid image") ); +wxObjectRefData* wxImage::CreateRefData() const +{ + return new wxImageRefData; +} - image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false ); +wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const +{ + const wxImageRefData* refData = wx_static_cast(const wxImageRefData*, that); + wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") ); - unsigned char *data = image.GetData(); + wxImageRefData* refData_new = new wxImageRefData; + refData_new->m_width = refData->m_width; + refData_new->m_height = refData->m_height; + refData_new->m_maskRed = refData->m_maskRed; + refData_new->m_maskGreen = refData->m_maskGreen; + refData_new->m_maskBlue = refData->m_maskBlue; + refData_new->m_hasMask = refData->m_hasMask; + refData_new->m_ok = true; + unsigned size = unsigned(refData->m_width) * unsigned(refData->m_height); + if (refData->m_alpha != NULL) + { + refData_new->m_alpha = (unsigned char*)malloc(size); + memcpy(refData_new->m_alpha, refData->m_alpha, size); + } + size *= 3; + refData_new->m_data = (unsigned char*)malloc(size); + memcpy(refData_new->m_data, refData->m_data, size); +#if wxUSE_PALETTE + refData_new->m_palette = refData->m_palette; +#endif + refData_new->m_optionNames = refData->m_optionNames; + refData_new->m_optionValues = refData->m_optionValues; + return refData_new; +} - wxCHECK_MSG( data, image, wxT("unable to create image") ); +wxImage wxImage::Copy() const +{ + wxImage image; - image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue ); - image.SetMask( M_IMGDATA->m_hasMask ); + wxCHECK_MSG( Ok(), image, wxT("invalid image") ); - memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 ); + image.m_refData = CloneRefData(m_refData); return image; } @@ -225,8 +292,8 @@ wxImage wxImage::Copy() const wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const { if( xFactor == 1 && yFactor == 1 ) - return Copy() ; - + return *this; + wxImage image; wxCHECK_MSG( Ok(), image, wxT("invalid image") ); @@ -237,7 +304,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const long old_height = M_IMGDATA->m_height, old_width = M_IMGDATA->m_width; - + wxCHECK_MSG( (old_height > 0) && (old_width > 0), image, wxT("invalid old image size") ); @@ -254,20 +321,32 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const unsigned char maskRed = 0; unsigned char maskGreen = 0; unsigned char maskBlue =0 ; + + unsigned char *source_data = M_IMGDATA->m_data; + unsigned char *target_data = data; + unsigned char *source_alpha = 0 ; + unsigned char *target_alpha = 0 ; if (M_IMGDATA->m_hasMask) { hasMask = true ; maskRed = M_IMGDATA->m_maskRed; maskGreen = M_IMGDATA->m_maskGreen; maskBlue =M_IMGDATA->m_maskBlue ; - + image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue ); } - char unsigned *source_data = M_IMGDATA->m_data; - char unsigned *target_data = data; - + else + { + source_alpha = M_IMGDATA->m_alpha ; + if ( source_alpha ) + { + image.SetAlpha() ; + target_alpha = image.GetAlpha() ; + } + } + for (long y = 0; y < height; y++) { for (long x = 0; x < width; x++) @@ -275,6 +354,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const unsigned long avgRed = 0 ; unsigned long avgGreen = 0; unsigned long avgBlue = 0; + unsigned long avgAlpha = 0 ; unsigned long counter = 0 ; // determine average for ( int y1 = 0 ; y1 < yFactor ; ++y1 ) @@ -286,11 +366,18 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const unsigned char red = pixel[0] ; unsigned char green = pixel[1] ; unsigned char blue = pixel[2] ; + unsigned char alpha = 255 ; + if ( source_alpha ) + alpha = *(source_alpha + y_offset + x * xFactor + x1) ; if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue ) { - avgRed += red ; - avgGreen += green ; - avgBlue += blue ; + if ( alpha > 0 ) + { + avgRed += red ; + avgGreen += green ; + avgBlue += blue ; + } + avgAlpha += alpha ; counter++ ; } } @@ -303,6 +390,8 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const } else { + if ( source_alpha ) + *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ; *(target_data++) = (unsigned char)(avgRed / counter); *(target_data++) = (unsigned char)(avgGreen / counter); *(target_data++) = (unsigned char)(avgBlue / counter); @@ -310,7 +399,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const } } - // In case this is a cursor, make sure the hotspot is scalled accordingly: + // In case this is a cursor, make sure the hotspot is scaled accordingly: if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) ) image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor); @@ -321,7 +410,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const return image; } -wxImage wxImage::Scale( int width, int height ) const +wxImage wxImage::Scale( int width, int height, int quality ) const { wxImage image; @@ -336,52 +425,94 @@ wxImage wxImage::Scale( int width, int height ) const wxCHECK_MSG( (old_height > 0) && (old_width > 0), image, wxT("invalid old image size") ); - if ( old_width % width == 0 && old_width >= width && - old_height % height == 0 && old_height >= height ) + // If the image's new width and height are the same as the original, no + // need to waste time or CPU cycles + if ( old_width == width && old_height == height ) + return *this; + + // Scale the image (...or more appropriately, resample the image) using + // either the high-quality or normal method as specified + if ( quality == wxIMAGE_QUALITY_HIGH ) { - return ShrinkBy( old_width / width , old_height / height ) ; + // We need to check whether we are downsampling or upsampling the image + if ( width < old_width && height < old_height ) + { + // Downsample the image using the box averaging method for best results + image = ResampleBox(width, height); + } + else + { + // For upsampling or other random/wierd image dimensions we'll use + // a bicubic b-spline scaling method + image = ResampleBicubic(width, height); + } } - image.Create( width, height, false ); + else // Default scaling method == simple pixel replication + { + if ( old_width % width == 0 && old_width >= width && + old_height % height == 0 && old_height >= height ) + { + return ShrinkBy( old_width / width , old_height / height ) ; + } + image.Create( width, height, false ); - unsigned char *data = image.GetData(); + unsigned char *data = image.GetData(); - wxCHECK_MSG( data, image, wxT("unable to create image") ); + wxCHECK_MSG( data, image, wxT("unable to create image") ); - if (M_IMGDATA->m_hasMask) - { - image.SetMaskColour( M_IMGDATA->m_maskRed, - M_IMGDATA->m_maskGreen, - M_IMGDATA->m_maskBlue ); - } + unsigned char *source_data = M_IMGDATA->m_data; + unsigned char *target_data = data; + unsigned char *source_alpha = 0 ; + unsigned char *target_alpha = 0 ; - unsigned char *source_data = M_IMGDATA->m_data; - unsigned char *target_data = data; + if ( !M_IMGDATA->m_hasMask ) + { + source_alpha = M_IMGDATA->m_alpha ; + if ( source_alpha ) + { + image.SetAlpha() ; + target_alpha = image.GetAlpha() ; + } + } - long x_delta = (old_width<<16) / width; - long y_delta = (old_height<<16) / height; + long x_delta = (old_width<<16) / width; + long y_delta = (old_height<<16) / height; - unsigned char* dest_pixel = target_data; + unsigned char* dest_pixel = target_data; - long y = 0; - for ( long j = 0; j < height; j++ ) + long y = 0; + for ( long j = 0; j < height; j++ ) { - unsigned char* src_line = &source_data[(y>>16)*old_width*3]; + unsigned char* src_line = &source_data[(y>>16)*old_width*3]; + unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ; - long x = 0; - for ( long i = 0; i < width; i++ ) - { - unsigned char* src_pixel = &src_line[(x>>16)*3]; - dest_pixel[0] = src_pixel[0]; - dest_pixel[1] = src_pixel[1]; - dest_pixel[2] = src_pixel[2]; - dest_pixel += 3; - x += x_delta; + long x = 0; + for ( long i = 0; i < width; i++ ) + { + unsigned char* src_pixel = &src_line[(x>>16)*3]; + unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ; + dest_pixel[0] = src_pixel[0]; + dest_pixel[1] = src_pixel[1]; + dest_pixel[2] = src_pixel[2]; + dest_pixel += 3; + if ( source_alpha ) + *(target_alpha++) = *src_alpha_pixel ; + x += x_delta; + } + + y += y_delta; } + } - y += y_delta; + // If the original image has a mask, apply the mask to the new image + if (M_IMGDATA->m_hasMask) + { + image.SetMaskColour( M_IMGDATA->m_maskRed, + M_IMGDATA->m_maskGreen, + M_IMGDATA->m_maskBlue ); } - // In case this is a cursor, make sure the hotspot is scalled accordingly: + // In case this is a cursor, make sure the hotspot is scaled accordingly: if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) ) image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width); @@ -392,6 +523,468 @@ wxImage wxImage::Scale( int width, int height ) const return image; } +wxImage wxImage::ResampleBox(int width, int height) const +{ + // This function implements a simple pre-blur/box averaging method for + // downsampling that gives reasonably smooth results To scale the image + // down we will need to gather a grid of pixels of the size of the scale + // factor in each direction and then do an averaging of the pixels. + + wxImage ret_image(width, height, false); + + const double scale_factor_x = double(M_IMGDATA->m_width) / width; + const double scale_factor_y = double(M_IMGDATA->m_height) / height; + + const int scale_factor_x_2 = (int)(scale_factor_x / 2); + const int scale_factor_y_2 = (int)(scale_factor_y / 2); + + // If we want good-looking results we need to pre-blur the image a bit first + wxImage src_image(*this); + src_image = src_image.BlurHorizontal(scale_factor_x_2); + src_image = src_image.BlurVertical(scale_factor_y_2); + + unsigned char* src_data = src_image.GetData(); + unsigned char* src_alpha = src_image.GetAlpha(); + unsigned char* dst_data = ret_image.GetData(); + unsigned char* dst_alpha = NULL; + + if ( src_alpha ) + { + ret_image.SetAlpha(); + dst_alpha = ret_image.GetAlpha(); + } + + int averaged_pixels, src_pixel_index; + double sum_r, sum_g, sum_b, sum_a; + + for ( int y = 0; y < height; y++ ) // Destination image - Y direction + { + // Source pixel in the Y direction + int src_y = (int)(y * scale_factor_y); + + for ( int x = 0; x < width; x++ ) // Destination image - X direction + { + // Source pixel in the X direction + int src_x = (int)(x * scale_factor_x); + + // Box of pixels to average + averaged_pixels = 0; + sum_r = sum_g = sum_b = sum_a = 0.0; + + for ( int j = int(src_y - scale_factor_y/2.0 + 1); + j <= int(src_y + scale_factor_y_2); + j++ ) + { + // We don't care to average pixels that don't exist (edges) + if ( j < 0 || j > M_IMGDATA->m_height ) + continue; + + for ( int i = int(src_x - scale_factor_x/2.0 + 1); + i <= src_x + scale_factor_x_2; + i++ ) + { + // Don't average edge pixels + if ( i < 0 || i > M_IMGDATA->m_width ) + continue; + + // Calculate the actual index in our source pixels + src_pixel_index = src_y * M_IMGDATA->m_width + src_x; + + sum_r += src_data[src_pixel_index * 3 + 0]; + sum_g += src_data[src_pixel_index * 3 + 1]; + sum_b += src_data[src_pixel_index * 3 + 2]; + if ( src_alpha ) + sum_a += src_alpha[src_pixel_index]; + + averaged_pixels++; + } + } + + // Calculate the average from the sum and number of averaged pixels + dst_data[0] = (unsigned char)(sum_r / averaged_pixels); + dst_data[1] = (unsigned char)(sum_g / averaged_pixels); + dst_data[2] = (unsigned char)(sum_b / averaged_pixels); + dst_data += 3; + if ( src_alpha ) + *dst_alpha++ = (unsigned char)(sum_a / averaged_pixels); + } + } + + return ret_image; +} + +// The following two local functions are for the B-spline weighting of the +// bicubic sampling algorithm +static inline double spline_cube(double value) +{ + return value <= 0.0 ? 0.0 : value * value * value; +} + +static inline double spline_weight(double value) +{ + return (spline_cube(value + 2) - + 4 * spline_cube(value + 1) + + 6 * spline_cube(value) - + 4 * spline_cube(value - 1)) / 6; +} + +// This is the bicubic resampling algorithm +wxImage wxImage::ResampleBicubic(int width, int height) const +{ + // This function implements a Bicubic B-Spline algorithm for resampling. + // This method is certainly a little slower than wxImage's default pixel + // replication method, however for most reasonably sized images not being + // upsampled too much on a fairly average CPU this difference is hardly + // noticeable and the results are far more pleasing to look at. + // + // This particular bicubic algorithm does pixel weighting according to a + // B-Spline that basically implements a Gaussian bell-like weighting + // kernel. Because of this method the results may appear a bit blurry when + // upsampling by large factors. This is basically because a slight + // gaussian blur is being performed to get the smooth look of the upsampled + // image. + + // Edge pixels: 3-4 possible solutions + // - (Wrap/tile) Wrap the image, take the color value from the opposite + // side of the image. + // - (Mirror) Duplicate edge pixels, so that pixel at coordinate (2, n), + // where n is nonpositive, will have the value of (2, 1). + // - (Ignore) Simply ignore the edge pixels and apply the kernel only to + // pixels which do have all neighbours. + // - (Clamp) Choose the nearest pixel along the border. This takes the + // border pixels and extends them out to infinity. + // + // NOTE: below the y_offset and x_offset variables are being set for edge + // pixels using the "Mirror" method mentioned above + + wxImage ret_image; + + ret_image.Create(width, height, false); + + unsigned char* src_data = M_IMGDATA->m_data; + unsigned char* src_alpha = M_IMGDATA->m_alpha; + unsigned char* dst_data = ret_image.GetData(); + unsigned char* dst_alpha = NULL; + + if ( src_alpha ) + { + ret_image.SetAlpha(); + dst_alpha = ret_image.GetAlpha(); + } + + for ( int dsty = 0; dsty < height; dsty++ ) + { + // We need to calculate the source pixel to interpolate from - Y-axis + double srcpixy = double(dsty * M_IMGDATA->m_height) / height; + double dy = srcpixy - (int)srcpixy; + + for ( int dstx = 0; dstx < width; dstx++ ) + { + // X-axis of pixel to interpolate from + double srcpixx = double(dstx * M_IMGDATA->m_width) / width; + double dx = srcpixx - (int)srcpixx; + + // Sums for each color channel + double sum_r = 0, sum_g = 0, sum_b = 0, sum_a = 0; + + // Here we actually determine the RGBA values for the destination pixel + for ( int k = -1; k <= 2; k++ ) + { + // Y offset + int y_offset = srcpixy + k < 0.0 + ? 0 + : srcpixy + k >= M_IMGDATA->m_height + ? M_IMGDATA->m_height - 1 + : (int)(srcpixy + k); + + // Loop across the X axis + for ( int i = -1; i <= 2; i++ ) + { + // X offset + int x_offset = srcpixx + i < 0.0 + ? 0 + : srcpixx + i >= M_IMGDATA->m_width + ? M_IMGDATA->m_width - 1 + : (int)(srcpixx + i); + + // Calculate the exact position where the source data + // should be pulled from based on the x_offset and y_offset + int src_pixel_index = y_offset*M_IMGDATA->m_width + x_offset; + + // Calculate the weight for the specified pixel according + // to the bicubic b-spline kernel we're using for + // interpolation + double + pixel_weight = spline_weight(i - dx)*spline_weight(k - dy); + + // Create a sum of all velues for each color channel + // adjusted for the pixel's calculated weight + sum_r += src_data[src_pixel_index * 3 + 0] * pixel_weight; + sum_g += src_data[src_pixel_index * 3 + 1] * pixel_weight; + sum_b += src_data[src_pixel_index * 3 + 2] * pixel_weight; + if ( src_alpha ) + sum_a += src_alpha[src_pixel_index] * pixel_weight; + } + } + + // Put the data into the destination image. The summed values are + // of double data type and are rounded here for accuracy + dst_data[0] = (unsigned char)(sum_r + 0.5); + dst_data[1] = (unsigned char)(sum_g + 0.5); + dst_data[2] = (unsigned char)(sum_b + 0.5); + dst_data += 3; + + if ( src_alpha ) + *dst_alpha++ = (unsigned char)sum_a; + } + } + + return ret_image; +} + +// Blur in the horizontal direction +wxImage wxImage::BlurHorizontal(int blurRadius) const +{ + wxImage ret_image; + ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false); + + unsigned char* src_data = M_IMGDATA->m_data; + unsigned char* dst_data = ret_image.GetData(); + unsigned char* src_alpha = M_IMGDATA->m_alpha; + unsigned char* dst_alpha = NULL; + + // Check for a mask or alpha + if ( src_alpha ) + { + ret_image.SetAlpha(); + dst_alpha = ret_image.GetAlpha(); + } + else if ( M_IMGDATA->m_hasMask ) + { + ret_image.SetMaskColour(M_IMGDATA->m_maskRed, + M_IMGDATA->m_maskGreen, + M_IMGDATA->m_maskBlue); + } + + // number of pixels we average over + const int blurArea = blurRadius*2 + 1; + + // Horizontal blurring algorithm - average all pixels in the specified blur + // radius in the X or horizontal direction + for ( int y = 0; y < M_IMGDATA->m_height; y++ ) + { + // Variables used in the blurring algorithm + long sum_r = 0, + sum_g = 0, + sum_b = 0, + sum_a = 0; + + long pixel_idx; + const unsigned char *src; + unsigned char *dst; + + // Calculate the average of all pixels in the blur radius for the first + // pixel of the row + for ( int kernel_x = -blurRadius; kernel_x <= blurRadius; kernel_x++ ) + { + // To deal with the pixels at the start of a row so it's not + // grabbing GOK values from memory at negative indices of the + // image's data or grabbing from the previous row + if ( kernel_x < 0 ) + pixel_idx = y * M_IMGDATA->m_width; + else + pixel_idx = kernel_x + y * M_IMGDATA->m_width; + + src = src_data + pixel_idx*3; + sum_r += src[0]; + sum_g += src[1]; + sum_b += src[2]; + if ( src_alpha ) + sum_a += src_alpha[pixel_idx]; + } + + dst = dst_data + y * M_IMGDATA->m_width*3; + dst[0] = (unsigned char)(sum_r / blurArea); + dst[1] = (unsigned char)(sum_g / blurArea); + dst[2] = (unsigned char)(sum_b / blurArea); + if ( src_alpha ) + dst_alpha[y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea); + + // Now average the values of the rest of the pixels by just moving the + // blur radius box along the row + for ( int x = 1; x < M_IMGDATA->m_width; x++ ) + { + // Take care of edge pixels on the left edge by essentially + // duplicating the edge pixel + if ( x - blurRadius - 1 < 0 ) + pixel_idx = y * M_IMGDATA->m_width; + else + pixel_idx = (x - blurRadius - 1) + y * M_IMGDATA->m_width; + + // Subtract the value of the pixel at the left side of the blur + // radius box + src = src_data + pixel_idx*3; + sum_r -= src[0]; + sum_g -= src[1]; + sum_b -= src[2]; + if ( src_alpha ) + sum_a -= src_alpha[pixel_idx]; + + // Take care of edge pixels on the right edge + if ( x + blurRadius > M_IMGDATA->m_width - 1 ) + pixel_idx = M_IMGDATA->m_width - 1 + y * M_IMGDATA->m_width; + else + pixel_idx = x + blurRadius + y * M_IMGDATA->m_width; + + // Add the value of the pixel being added to the end of our box + src = src_data + pixel_idx*3; + sum_r += src[0]; + sum_g += src[1]; + sum_b += src[2]; + if ( src_alpha ) + sum_a += src_alpha[pixel_idx]; + + // Save off the averaged data + dst = dst_data + x*3 + y*M_IMGDATA->m_width*3; + dst[0] = (unsigned char)(sum_r / blurArea); + dst[1] = (unsigned char)(sum_g / blurArea); + dst[2] = (unsigned char)(sum_b / blurArea); + if ( src_alpha ) + dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea); + } + } + + return ret_image; +} + +// Blur in the vertical direction +wxImage wxImage::BlurVertical(int blurRadius) const +{ + wxImage ret_image; + ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false); + + unsigned char* src_data = M_IMGDATA->m_data; + unsigned char* dst_data = ret_image.GetData(); + unsigned char* src_alpha = M_IMGDATA->m_alpha; + unsigned char* dst_alpha = NULL; + + // Check for a mask or alpha + if ( src_alpha ) + { + ret_image.SetAlpha(); + dst_alpha = ret_image.GetAlpha(); + } + else if ( M_IMGDATA->m_hasMask ) + { + ret_image.SetMaskColour(M_IMGDATA->m_maskRed, + M_IMGDATA->m_maskGreen, + M_IMGDATA->m_maskBlue); + } + + // number of pixels we average over + const int blurArea = blurRadius*2 + 1; + + // Vertical blurring algorithm - same as horizontal but switched the + // opposite direction + for ( int x = 0; x < M_IMGDATA->m_width; x++ ) + { + // Variables used in the blurring algorithm + long sum_r = 0, + sum_g = 0, + sum_b = 0, + sum_a = 0; + + long pixel_idx; + const unsigned char *src; + unsigned char *dst; + + // Calculate the average of all pixels in our blur radius box for the + // first pixel of the column + for ( int kernel_y = -blurRadius; kernel_y <= blurRadius; kernel_y++ ) + { + // To deal with the pixels at the start of a column so it's not + // grabbing GOK values from memory at negative indices of the + // image's data or grabbing from the previous column + if ( kernel_y < 0 ) + pixel_idx = x; + else + pixel_idx = x + kernel_y * M_IMGDATA->m_width; + + src = src_data + pixel_idx*3; + sum_r += src[0]; + sum_g += src[1]; + sum_b += src[2]; + if ( src_alpha ) + sum_a += src_alpha[pixel_idx]; + } + + dst = dst_data + x*3; + dst[0] = (unsigned char)(sum_r / blurArea); + dst[1] = (unsigned char)(sum_g / blurArea); + dst[2] = (unsigned char)(sum_b / blurArea); + if ( src_alpha ) + dst_alpha[x] = (unsigned char)(sum_a / blurArea); + + // Now average the values of the rest of the pixels by just moving the + // box along the column from top to bottom + for ( int y = 1; y < M_IMGDATA->m_height; y++ ) + { + // Take care of pixels that would be beyond the top edge by + // duplicating the top edge pixel for the column + if ( y - blurRadius - 1 < 0 ) + pixel_idx = x; + else + pixel_idx = x + (y - blurRadius - 1) * M_IMGDATA->m_width; + + // Subtract the value of the pixel at the top of our blur radius box + src = src_data + pixel_idx*3; + sum_r -= src[0]; + sum_g -= src[1]; + sum_b -= src[2]; + if ( src_alpha ) + sum_a -= src_alpha[pixel_idx]; + + // Take care of the pixels that would be beyond the bottom edge of + // the image similar to the top edge + if ( y + blurRadius > M_IMGDATA->m_height - 1 ) + pixel_idx = x + (M_IMGDATA->m_height - 1) * M_IMGDATA->m_width; + else + pixel_idx = x + (blurRadius + y) * M_IMGDATA->m_width; + + // Add the value of the pixel being added to the end of our box + src = src_data + pixel_idx*3; + sum_r += src[0]; + sum_g += src[1]; + sum_b += src[2]; + if ( src_alpha ) + sum_a += src_alpha[pixel_idx]; + + // Save off the averaged data + dst = dst_data + (x + y * M_IMGDATA->m_width) * 3; + dst[0] = (unsigned char)(sum_r / blurArea); + dst[1] = (unsigned char)(sum_g / blurArea); + dst[2] = (unsigned char)(sum_b / blurArea); + if ( src_alpha ) + dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea); + } + } + + return ret_image; +} + +// The new blur function +wxImage wxImage::Blur(int blurRadius) const +{ + wxImage ret_image; + ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false); + + // Blur the image in each direction + ret_image = BlurHorizontal(blurRadius); + ret_image = ret_image.BlurVertical(blurRadius); + + return ret_image; +} + wxImage wxImage::Rotate90( bool clockwise ) const { wxImage image; @@ -404,25 +997,53 @@ wxImage wxImage::Rotate90( bool clockwise ) const wxCHECK_MSG( data, image, wxT("unable to create image") ); + unsigned char *source_data = M_IMGDATA->m_data; + unsigned char *target_data; + unsigned char *alpha_data = 0 ; + unsigned char *source_alpha = 0 ; + unsigned char *target_alpha = 0 ; + if (M_IMGDATA->m_hasMask) + { image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue ); + } + else + { + source_alpha = M_IMGDATA->m_alpha ; + if ( source_alpha ) + { + image.SetAlpha() ; + alpha_data = image.GetAlpha() ; + } + } long height = M_IMGDATA->m_height; long width = M_IMGDATA->m_width; - unsigned char *source_data = M_IMGDATA->m_data; - unsigned char *target_data; - for (long j = 0; j < height; j++) { for (long i = 0; i < width; i++) { if (clockwise) + { target_data = data + (((i+1)*height) - j - 1)*3; + if(source_alpha) + target_alpha = alpha_data + (((i+1)*height) - j - 1); + } else + { target_data = data + ((height*(width-1)) + j - (i*height))*3; + if(source_alpha) + target_alpha = alpha_data + ((height*(width-1)) + j - (i*height)); + } memcpy( target_data, source_data, 3 ); source_data += 3; + + if(source_alpha) + { + memcpy( target_alpha, source_alpha, 1 ); + source_alpha += 1; + } } } @@ -438,9 +1059,16 @@ wxImage wxImage::Mirror( bool horizontally ) const image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false ); unsigned char *data = image.GetData(); + unsigned char *alpha = NULL; wxCHECK_MSG( data, image, wxT("unable to create image") ); + if (M_IMGDATA->m_alpha != NULL) { + image.SetAlpha(); + alpha = image.GetAlpha(); + wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") ); + } + if (M_IMGDATA->m_hasMask) image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue ); @@ -463,6 +1091,25 @@ wxImage wxImage::Mirror( bool horizontally ) const target_data -= 3; } } + + if (alpha != NULL) + { + // src_alpha starts at the first pixel and increases by 1 after each step + // (a step here is the copy of the alpha value of one pixel) + const unsigned char *src_alpha = M_IMGDATA->m_alpha; + // dest_alpha starts just beyond the first line, decreases before each step, + // and after each line is finished, increases by 2 widths (skipping the line + // just copied and the line that will be copied next) + unsigned char *dest_alpha = alpha + width; + + for (long jj = 0; jj < height; ++jj) + { + for (long i = 0; i < width; ++i) { + *(--dest_alpha) = *(src_alpha++); // copy one pixel + } + dest_alpha += 2 * width; // advance beyond the end of the next line + } + } } else { @@ -472,6 +1119,23 @@ wxImage wxImage::Mirror( bool horizontally ) const memcpy( target_data, source_data, (size_t)3*width ); source_data += 3*width; } + + if (alpha != NULL) + { + // src_alpha starts at the first pixel and increases by 1 width after each step + // (a step here is the copy of the alpha channel of an entire line) + const unsigned char *src_alpha = M_IMGDATA->m_alpha; + // dest_alpha starts just beyond the last line (beyond the whole image) + // and decreases by 1 width before each step + unsigned char *dest_alpha = alpha + width * height; + + for (long jj = 0; jj < height; ++jj) + { + dest_alpha -= width; + memcpy( dest_alpha, src_alpha, (size_t)width ); + src_alpha += width; + } + } } return image; @@ -483,32 +1147,89 @@ wxImage wxImage::GetSubImage( const wxRect &rect ) const wxCHECK_MSG( Ok(), image, wxT("invalid image") ); - wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()), + wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && + (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()), image, wxT("invalid subimage size") ); - int subwidth=rect.GetWidth(); - const int subheight=rect.GetHeight(); + const int subwidth = rect.GetWidth(); + const int subheight = rect.GetHeight(); image.Create( subwidth, subheight, false ); - unsigned char *subdata = image.GetData(), *data=GetData(); + const unsigned char *src_data = GetData(); + const unsigned char *src_alpha = M_IMGDATA->m_alpha; + unsigned char *subdata = image.GetData(); + unsigned char *subalpha = NULL; wxCHECK_MSG( subdata, image, wxT("unable to create image") ); + if (src_alpha != NULL) { + image.SetAlpha(); + subalpha = image.GetAlpha(); + wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel")); + } + if (M_IMGDATA->m_hasMask) image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue ); - const int subleft=3*rect.GetLeft(); - const int width=3*GetWidth(); - subwidth*=3; + const int width = GetWidth(); + const int pixsoff = rect.GetLeft() + width * rect.GetTop(); - data+=rect.GetTop()*width+subleft; + src_data += 3 * pixsoff; + src_alpha += pixsoff; // won't be used if was NULL, so this is ok for (long j = 0; j < subheight; ++j) { - memcpy( subdata, data, subwidth); - subdata+=subwidth; - data+=width; + memcpy( subdata, src_data, 3 * subwidth ); + subdata += 3 * subwidth; + src_data += 3 * width; + if (subalpha != NULL) { + memcpy( subalpha, src_alpha, subwidth ); + subalpha += subwidth; + src_alpha += width; + } + } + + return image; +} + +wxImage wxImage::Size( const wxSize& size, const wxPoint& pos, + int r_, int g_, int b_ ) const +{ + wxImage image; + + wxCHECK_MSG( Ok(), image, wxT("invalid image") ); + wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") ); + + int width = GetWidth(), height = GetHeight(); + image.Create(size.GetWidth(), size.GetHeight(), false); + + unsigned char r = (unsigned char)r_; + unsigned char g = (unsigned char)g_; + unsigned char b = (unsigned char)b_; + if ((r_ == -1) && (g_ == -1) && (b_ == -1)) + { + GetOrFindMaskColour( &r, &g, &b ); + image.SetMaskColour(r, g, b); + } + + image.SetRGB(wxRect(), r, g, b); + + wxRect subRect(pos.x, pos.y, width, height); + wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight()); + if (pos.x < 0) + finalRect.width -= pos.x; + if (pos.y < 0) + finalRect.height -= pos.y; + + subRect.Intersect(finalRect); + + if (!subRect.IsEmpty()) + { + if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height)) + image.Paste(*this, pos.x, pos.y); + else + image.Paste(GetSubImage(subRect), pos.x, pos.y); } return image; @@ -519,6 +1240,8 @@ void wxImage::Paste( const wxImage &image, int x, int y ) wxCHECK_RET( Ok(), wxT("invalid image") ); wxCHECK_RET( image.Ok(), wxT("invalid image") ); + AllocExclusive(); + int xx = 0; int yy = 0; int width = image.GetWidth(); @@ -544,6 +1267,7 @@ void wxImage::Paste( const wxImage &image, int x, int y ) if (height < 1) return; if ((!HasMask() && !image.HasMask()) || + (HasMask() && !image.HasMask()) || ((HasMask() && image.HasMask() && (GetMaskRed()==image.GetMaskRed()) && (GetMaskGreen()==image.GetMaskGreen()) && @@ -581,8 +1305,8 @@ void wxImage::Paste( const wxImage &image, int x, int y ) { for (int i = 0; i < width; i+=3) { - if ((source_data[i] != r) && - (source_data[i+1] != g) && + if ((source_data[i] != r) || + (source_data[i+1] != g) || (source_data[i+2] != b)) { memcpy( target_data+i, source_data+i, 3 ); @@ -599,6 +1323,8 @@ void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1, { wxCHECK_RET( Ok(), wxT("invalid image") ); + AllocExclusive(); + unsigned char *data = GetData(); const int w = GetWidth(); @@ -617,6 +1343,56 @@ void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1, } } +wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const +{ + wxImage image; + + wxCHECK_MSG( Ok(), image, wxT("invalid image") ); + + image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false); + + unsigned char *dest = image.GetData(); + + wxCHECK_MSG( dest, image, wxT("unable to create image") ); + + unsigned char *src = M_IMGDATA->m_data; + bool hasMask = M_IMGDATA->m_hasMask; + unsigned char maskRed = M_IMGDATA->m_maskRed; + unsigned char maskGreen = M_IMGDATA->m_maskGreen; + unsigned char maskBlue = M_IMGDATA->m_maskBlue; + + if ( hasMask ) + image.SetMaskColour(maskRed, maskGreen, maskBlue); + + const long size = M_IMGDATA->m_width * M_IMGDATA->m_height; + for ( long i = 0; i < size; i++, src += 3, dest += 3 ) + { + // don't modify the mask + if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue ) + { + memcpy(dest, src, 3); + } + else + { + // calculate the luma + double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5; + dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma); + } + } + + // copy the alpha channel, if any + if (HasAlpha()) + { + const size_t alphaSize = GetWidth() * GetHeight(); + unsigned char *alpha = (unsigned char*)malloc(alphaSize); + memcpy(alpha, GetAlpha(), alphaSize); + image.InitAlpha(); + image.SetAlpha(alpha); + } + + return image; +} + wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const { wxImage image; @@ -651,68 +1427,118 @@ wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char tard[0] = tard[1] = tard[2] = 0; } - return image; + return image; +} + +int wxImage::GetWidth() const +{ + wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); + + return M_IMGDATA->m_width; +} + +int wxImage::GetHeight() const +{ + wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); + + return M_IMGDATA->m_height; +} + +long wxImage::XYToIndex(int x, int y) const +{ + if ( Ok() && + x >= 0 && y >= 0 && + x < M_IMGDATA->m_width && y < M_IMGDATA->m_height ) + { + return y*M_IMGDATA->m_width + x; + } + + return -1; } void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b ) { - wxCHECK_RET( Ok(), wxT("invalid image") ); + long pos = XYToIndex(x, y); + wxCHECK_RET( pos != -1, wxT("invalid image coordinates") ); - int w = M_IMGDATA->m_width; - int h = M_IMGDATA->m_height; + AllocExclusive(); - wxCHECK_RET( (x>=0) && (y>=0) && (xm_data[ pos ] = r; M_IMGDATA->m_data[ pos+1 ] = g; M_IMGDATA->m_data[ pos+2 ] = b; } -unsigned char wxImage::GetRed( int x, int y ) const +void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b ) { - wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); + wxCHECK_RET( Ok(), wxT("invalid image") ); - int w = M_IMGDATA->m_width; - int h = M_IMGDATA->m_height; + AllocExclusive(); - wxCHECK_MSG( (x>=0) && (y>=0) && (xm_data[pos]; + unsigned char *data wxDUMMY_INITIALIZE(NULL); + int x, y, width = GetWidth(); + for (y = y1; y < y2; y++) + { + data = M_IMGDATA->m_data + (y*width + x1)*3; + for (x = x1; x < x2; x++) + { + *data++ = r; + *data++ = g; + *data++ = b; + } + } } -unsigned char wxImage::GetGreen( int x, int y ) const +unsigned char wxImage::GetRed( int x, int y ) const { - wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); + long pos = XYToIndex(x, y); + wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") ); + + pos *= 3; - int w = M_IMGDATA->m_width; - int h = M_IMGDATA->m_height; + return M_IMGDATA->m_data[pos]; +} - wxCHECK_MSG( (x>=0) && (y>=0) && (xm_data[pos+1]; } unsigned char wxImage::GetBlue( int x, int y ) const { - wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); - - int w = M_IMGDATA->m_width; - int h = M_IMGDATA->m_height; + long pos = XYToIndex(x, y); + wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") ); - wxCHECK_MSG( (x>=0) && (y>=0) && (xm_data[pos+2]; } -bool wxImage::Ok() const +bool wxImage::IsOk() const { // image of 0 width or height can't be considered ok - at least because it // causes crashes in ConvertToBitmap() if we don't catch it in time @@ -727,7 +1553,7 @@ unsigned char *wxImage::GetData() const return M_IMGDATA->m_data; } -void wxImage::SetData( unsigned char *data ) +void wxImage::SetData( unsigned char *data, bool static_data ) { wxCHECK_RET( Ok(), wxT("invalid image") ); @@ -741,13 +1567,14 @@ void wxImage::SetData( unsigned char *data ) newRefData->m_maskGreen = M_IMGDATA->m_maskGreen; newRefData->m_maskBlue = M_IMGDATA->m_maskBlue; newRefData->m_hasMask = M_IMGDATA->m_hasMask; + newRefData->m_static = static_data; UnRef(); m_refData = newRefData; } -void wxImage::SetData( unsigned char *data, int new_width, int new_height ) +void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data ) { wxImageRefData *newRefData = new wxImageRefData(); @@ -769,6 +1596,7 @@ void wxImage::SetData( unsigned char *data, int new_width, int new_height ) newRefData->m_data = data; newRefData->m_ok = true; } + newRefData->m_static = static_data; UnRef(); @@ -781,39 +1609,67 @@ void wxImage::SetData( unsigned char *data, int new_width, int new_height ) void wxImage::SetAlpha(int x, int y, unsigned char alpha) { - wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") ); + wxCHECK_RET( HasAlpha(), wxT("no alpha channel") ); + + long pos = XYToIndex(x, y); + wxCHECK_RET( pos != -1, wxT("invalid image coordinates") ); - int w = M_IMGDATA->m_width, - h = M_IMGDATA->m_height; + AllocExclusive(); + + M_IMGDATA->m_alpha[pos] = alpha; +} + +unsigned char wxImage::GetAlpha(int x, int y) const +{ + wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") ); - wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") ); + long pos = XYToIndex(x, y); + wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") ); - M_IMGDATA->m_alpha[y*w + x] = alpha; + return M_IMGDATA->m_alpha[pos]; } -unsigned char wxImage::GetAlpha(int x, int y) +bool +wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b) { - wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") ); + SetAlpha(NULL); + + const int w = M_IMGDATA->m_width; + const int h = M_IMGDATA->m_height; - int w = M_IMGDATA->m_width, - h = M_IMGDATA->m_height; + unsigned char *alpha = GetAlpha(); + unsigned char *data = GetData(); - wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") ); + for ( int y = 0; y < h; y++ ) + { + for ( int x = 0; x < w; x++ ) + { + *alpha++ = *data; + *data++ = r; + *data++ = g; + *data++ = b; + } + } - return M_IMGDATA->m_alpha[y*w + x]; + return true; } -void wxImage::SetAlpha( unsigned char *alpha ) +void wxImage::SetAlpha( unsigned char *alpha, bool static_data ) { wxCHECK_RET( Ok(), wxT("invalid image") ); + AllocExclusive(); + if ( !alpha ) { alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height); } - delete [] M_IMGDATA->m_alpha; + if( !M_IMGDATA->m_staticAlpha ) + free(M_IMGDATA->m_alpha); + M_IMGDATA->m_alpha = alpha; + M_IMGDATA->m_staticAlpha = static_data; } unsigned char *wxImage::GetAlpha() const @@ -823,6 +1679,42 @@ unsigned char *wxImage::GetAlpha() const return M_IMGDATA->m_alpha; } +void wxImage::InitAlpha() +{ + wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") ); + + // initialize memory for alpha channel + SetAlpha(); + + unsigned char *alpha = M_IMGDATA->m_alpha; + const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height; + + if ( HasMask() ) + { + // use the mask to initialize the alpha channel. + const unsigned char * const alphaEnd = alpha + lenAlpha; + + const unsigned char mr = M_IMGDATA->m_maskRed; + const unsigned char mg = M_IMGDATA->m_maskGreen; + const unsigned char mb = M_IMGDATA->m_maskBlue; + for ( unsigned char *src = M_IMGDATA->m_data; + alpha < alphaEnd; + src += 3, alpha++ ) + { + *alpha = (src[0] == mr && src[1] == mg && src[2] == mb) + ? wxIMAGE_ALPHA_TRANSPARENT + : wxIMAGE_ALPHA_OPAQUE; + } + + M_IMGDATA->m_hasMask = false; + } + else // no mask + { + // make the image fully opaque + memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha); + } +} + // ---------------------------------------------------------------------------- // mask support // ---------------------------------------------------------------------------- @@ -831,12 +1723,32 @@ void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b ) { wxCHECK_RET( Ok(), wxT("invalid image") ); + AllocExclusive(); + M_IMGDATA->m_maskRed = r; M_IMGDATA->m_maskGreen = g; M_IMGDATA->m_maskBlue = b; M_IMGDATA->m_hasMask = true; } +bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const +{ + wxCHECK_MSG( Ok(), false, wxT("invalid image") ); + + if (M_IMGDATA->m_hasMask) + { + if (r) *r = M_IMGDATA->m_maskRed; + if (g) *g = M_IMGDATA->m_maskGreen; + if (b) *b = M_IMGDATA->m_maskBlue; + return true; + } + else + { + FindFirstUnusedColour(r, g, b); + return false; + } +} + unsigned char wxImage::GetMaskRed() const { wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); @@ -862,6 +1774,8 @@ void wxImage::SetMask( bool mask ) { wxCHECK_RET( Ok(), wxT("invalid image") ); + AllocExclusive(); + M_IMGDATA->m_hasMask = mask; } @@ -872,18 +1786,35 @@ bool wxImage::HasMask() const return M_IMGDATA->m_hasMask; } -int wxImage::GetWidth() const +bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const { - wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); + long pos = XYToIndex(x, y); + wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") ); - return M_IMGDATA->m_width; -} + // check mask + if ( M_IMGDATA->m_hasMask ) + { + const unsigned char *p = M_IMGDATA->m_data + 3*pos; + if ( p[0] == M_IMGDATA->m_maskRed && + p[1] == M_IMGDATA->m_maskGreen && + p[2] == M_IMGDATA->m_maskBlue ) + { + return true; + } + } -int wxImage::GetHeight() const -{ - wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); + // then check alpha + if ( M_IMGDATA->m_alpha ) + { + if ( M_IMGDATA->m_alpha[pos] < threshold ) + { + // transparent enough + return true; + } + } - return M_IMGDATA->m_height; + // not transparent + return false; } bool wxImage::SetMaskFromImage(const wxImage& mask, @@ -892,7 +1823,7 @@ bool wxImage::SetMaskFromImage(const wxImage& mask, // check that the images are the same size if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) ) { - wxLogError( _("Image and Mask have different sizes") ); + wxLogError( _("Image and mask have different sizes.") ); return false; } @@ -900,10 +1831,12 @@ bool wxImage::SetMaskFromImage(const wxImage& mask, unsigned char r,g,b ; if (!FindFirstUnusedColour(&r, &g, &b)) { - wxLogError( _("No Unused Color in image being masked") ); + wxLogError( _("No unused colour in image being masked.") ); return false ; } + AllocExclusive(); + unsigned char *imgdata = GetData(); unsigned char *maskdata = mask.GetData(); @@ -931,9 +1864,56 @@ bool wxImage::SetMaskFromImage(const wxImage& mask, return true; } -#if wxUSE_PALETTE +bool wxImage::ConvertAlphaToMask(unsigned char threshold) +{ + if (!HasAlpha()) + return true; + + unsigned char mr, mg, mb; + if (!FindFirstUnusedColour(&mr, &mg, &mb)) + { + wxLogError( _("No unused colour in image being masked.") ); + return false; + } + + AllocExclusive(); + + SetMask(true); + SetMaskColour(mr, mg, mb); + + unsigned char *imgdata = GetData(); + unsigned char *alphadata = GetAlpha(); + + int w = GetWidth(); + int h = GetHeight(); + + for (int y = 0; y < h; y++) + { + for (int x = 0; x < w; x++, imgdata += 3, alphadata++) + { + if (*alphadata < threshold) + { + imgdata[0] = mr; + imgdata[1] = mg; + imgdata[2] = mb; + } + } + } + + if( !M_IMGDATA->m_staticAlpha ) + free(M_IMGDATA->m_alpha); + + M_IMGDATA->m_alpha = NULL; + M_IMGDATA->m_staticAlpha = false; + return true; +} + +// ---------------------------------------------------------------------------- // Palette functions +// ---------------------------------------------------------------------------- + +#if wxUSE_PALETTE bool wxImage::HasPalette() const { @@ -954,16 +1934,23 @@ void wxImage::SetPalette(const wxPalette& palette) { wxCHECK_RET( Ok(), wxT("invalid image") ); + AllocExclusive(); + M_IMGDATA->m_palette = palette; } #endif // wxUSE_PALETTE +// ---------------------------------------------------------------------------- // Option functions (arbitrary name/value mapping) +// ---------------------------------------------------------------------------- + void wxImage::SetOption(const wxString& name, const wxString& value) { wxCHECK_RET( Ok(), wxT("invalid image") ); + AllocExclusive(); + int idx = M_IMGDATA->m_optionNames.Index(name, false); if (idx == wxNOT_FOUND) { @@ -997,8 +1984,6 @@ wxString wxImage::GetOption(const wxString& name) const int wxImage::GetOptionInt(const wxString& name) const { - wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); - return wxAtoi(GetOption(name)); } @@ -1009,12 +1994,18 @@ bool wxImage::HasOption(const wxString& name) const return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND); } -bool wxImage::LoadFile( const wxString& filename, long type, int index ) +// ---------------------------------------------------------------------------- +// image I/O +// ---------------------------------------------------------------------------- + +bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename), + long WXUNUSED_UNLESS_STREAMS(type), + int WXUNUSED_UNLESS_STREAMS(index) ) { -#if wxUSE_STREAMS +#if HAS_FILE_STREAMS if (wxFileExists(filename)) { - wxFileInputStream stream(filename); + wxImageFileInputStream stream(filename); wxBufferedInputStream bstream( stream ); return LoadFile(bstream, type, index); } @@ -1024,17 +2015,19 @@ bool wxImage::LoadFile( const wxString& filename, long type, int index ) return false; } -#else // !wxUSE_STREAMS +#else // !HAS_FILE_STREAMS return false; -#endif // wxUSE_STREAMS +#endif // HAS_FILE_STREAMS } -bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index ) +bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename), + const wxString& WXUNUSED_UNLESS_STREAMS(mimetype), + int WXUNUSED_UNLESS_STREAMS(index) ) { -#if wxUSE_STREAMS +#if HAS_FILE_STREAMS if (wxFileExists(filename)) { - wxFileInputStream stream(filename); + wxImageFileInputStream stream(filename); wxBufferedInputStream bstream( stream ); return LoadFile(bstream, mimetype, index); } @@ -1044,9 +2037,9 @@ bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int return false; } -#else // !wxUSE_STREAMS +#else // !HAS_FILE_STREAMS return false; -#endif // wxUSE_STREAMS +#endif // HAS_FILE_STREAMS } @@ -1067,56 +2060,63 @@ bool wxImage::SaveFile( const wxString& filename ) const return false; } -bool wxImage::SaveFile( const wxString& filename, int type ) const +bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename), + int WXUNUSED_UNLESS_STREAMS(type) ) const { -#if wxUSE_STREAMS +#if HAS_FILE_STREAMS + wxCHECK_MSG( Ok(), false, wxT("invalid image") ); + ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename); - wxFileOutputStream stream(filename); + wxImageFileOutputStream stream(filename); if ( stream.IsOk() ) { wxBufferedOutputStream bstream( stream ); return SaveFile(bstream, type); } -#endif // wxUSE_STREAMS +#endif // HAS_FILE_STREAMS return false; } -bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const +bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename), + const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const { -#if wxUSE_STREAMS +#if HAS_FILE_STREAMS + wxCHECK_MSG( Ok(), false, wxT("invalid image") ); + ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename); - wxFileOutputStream stream(filename); + wxImageFileOutputStream stream(filename); if ( stream.IsOk() ) { wxBufferedOutputStream bstream( stream ); return SaveFile(bstream, mimetype); } -#endif // wxUSE_STREAMS +#endif // HAS_FILE_STREAMS return false; } -bool wxImage::CanRead( const wxString &name ) +bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) ) { -#if wxUSE_STREAMS - wxFileInputStream stream(name); - return CanRead(stream); +#if HAS_FILE_STREAMS + wxImageFileInputStream stream(name); + return CanRead(stream); #else - return false; + return false; #endif } -int wxImage::GetImageCount( const wxString &name, long type ) +int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name), + long WXUNUSED_UNLESS_STREAMS(type) ) { -#if wxUSE_STREAMS - wxFileInputStream stream(name); - if (stream.Ok()) - return GetImageCount(stream, type); +#if HAS_FILE_STREAMS + wxImageFileInputStream stream(name); + if (stream.Ok()) + return GetImageCount(stream, type); #endif return 0; @@ -1162,7 +2162,7 @@ int wxImage::GetImageCount( wxInputStream &stream, long type ) if ( !handler ) { - wxLogWarning(_("No image handler for type %d defined."), type); + wxLogWarning(_("No image handler for type %ld defined."), type); return false; } @@ -1172,7 +2172,7 @@ int wxImage::GetImageCount( wxInputStream &stream, long type ) } else { - wxLogError(_("Image file is not of type %d."), type); + wxLogError(_("Image file is not of type %ld."), type); return 0; } } @@ -1205,12 +2205,18 @@ bool wxImage::LoadFile( wxInputStream& stream, long type, int index ) if (handler == 0) { - wxLogWarning( _("No image handler for type %d defined."), type ); + wxLogWarning( _("No image handler for type %ld defined."), type ); return false; } - return handler->LoadFile(this, stream, true/*verbose*/, index); + if (stream.IsSeekable() && !handler->CanRead(stream)) + { + wxLogError(_("Image file is not of type %ld."), type); + return false; + } + else + return handler->LoadFile(this, stream, true/*verbose*/, index); } bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index ) @@ -1228,7 +2234,13 @@ bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int ind return false; } - return handler->LoadFile( this, stream, true/*verbose*/, index ); + if (stream.IsSeekable() && !handler->CanRead(stream)) + { + wxLogError(_("Image file is not of type %s."), mimetype); + return false; + } + else + return handler->LoadFile( this, stream, true/*verbose*/, index ); } bool wxImage::SaveFile( wxOutputStream& stream, int type ) const @@ -1236,8 +2248,7 @@ bool wxImage::SaveFile( wxOutputStream& stream, int type ) const wxCHECK_MSG( Ok(), false, wxT("invalid image") ); wxImageHandler *handler = FindHandler(type); - - if (handler == 0) + if ( !handler ) { wxLogWarning( _("No image handler for type %d defined."), type ); @@ -1252,8 +2263,7 @@ bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const wxCHECK_MSG( Ok(), false, wxT("invalid image") ); wxImageHandler *handler = FindHandlerMime(mimetype); - - if (handler == 0) + if ( !handler ) { wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() ); @@ -1264,6 +2274,10 @@ bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const } #endif // wxUSE_STREAMS +// ---------------------------------------------------------------------------- +// image I/O handlers +// ---------------------------------------------------------------------------- + void wxImage::AddHandler( wxImageHandler *handler ) { // Check for an existing handler of the type being added. @@ -1324,7 +2338,7 @@ wxImageHandler *wxImage::FindHandler( const wxString& name ) node = node->GetNext(); } - return 0; + return NULL; } wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType ) @@ -1338,7 +2352,7 @@ wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType return handler; node = node->GetNext(); } - return 0; + return NULL; } wxImageHandler *wxImage::FindHandler( long bitmapType ) @@ -1350,7 +2364,7 @@ wxImageHandler *wxImage::FindHandler( long bitmapType ) if (handler->GetType() == bitmapType) return handler; node = node->GetNext(); } - return 0; + return NULL; } wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype ) @@ -1362,7 +2376,7 @@ wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype ) if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler; node = node->GetNext(); } - return 0; + return NULL; } void wxImage::InitStandardHandlers() @@ -1403,6 +2417,179 @@ wxString wxImage::GetImageExtWildcard() return wxT("(") + fmts + wxT(")|") + fmts; } +wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb) +{ + const double red = rgb.red / 255.0, + green = rgb.green / 255.0, + blue = rgb.blue / 255.0; + + // find the min and max intensity (and remember which one was it for the + // latter) + double minimumRGB = red; + if ( green < minimumRGB ) + minimumRGB = green; + if ( blue < minimumRGB ) + minimumRGB = blue; + + enum { RED, GREEN, BLUE } chMax = RED; + double maximumRGB = red; + if ( green > maximumRGB ) + { + chMax = GREEN; + maximumRGB = green; + } + if ( blue > maximumRGB ) + { + chMax = BLUE; + maximumRGB = blue; + } + + const double value = maximumRGB; + + double hue = 0.0, saturation; + const double deltaRGB = maximumRGB - minimumRGB; + if ( wxIsNullDouble(deltaRGB) ) + { + // Gray has no color + hue = 0.0; + saturation = 0.0; + } + else + { + switch ( chMax ) + { + case RED: + hue = (green - blue) / deltaRGB; + break; + + case GREEN: + hue = 2.0 + (blue - red) / deltaRGB; + break; + + case BLUE: + hue = 4.0 + (red - green) / deltaRGB; + break; + + default: + wxFAIL_MSG(wxT("hue not specified")); + break; + } + + hue /= 6.0; + + if ( hue < 0.0 ) + hue += 1.0; + + saturation = deltaRGB / maximumRGB; + } + + return HSVValue(hue, saturation, value); +} + +wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv) +{ + double red, green, blue; + + if ( wxIsNullDouble(hsv.saturation) ) + { + // Grey + red = hsv.value; + green = hsv.value; + blue = hsv.value; + } + else // not grey + { + double hue = hsv.hue * 6.0; // sector 0 to 5 + int i = (int)floor(hue); + double f = hue - i; // fractional part of h + double p = hsv.value * (1.0 - hsv.saturation); + + switch (i) + { + case 0: + red = hsv.value; + green = hsv.value * (1.0 - hsv.saturation * (1.0 - f)); + blue = p; + break; + + case 1: + red = hsv.value * (1.0 - hsv.saturation * f); + green = hsv.value; + blue = p; + break; + + case 2: + red = p; + green = hsv.value; + blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f)); + break; + + case 3: + red = p; + green = hsv.value * (1.0 - hsv.saturation * f); + blue = hsv.value; + break; + + case 4: + red = hsv.value * (1.0 - hsv.saturation * (1.0 - f)); + green = p; + blue = hsv.value; + break; + + default: // case 5: + red = hsv.value; + green = p; + blue = hsv.value * (1.0 - hsv.saturation * f); + break; + } + } + + return RGBValue((unsigned char)(red * 255.0), + (unsigned char)(green * 255.0), + (unsigned char)(blue * 255.0)); +} + +/* + * Rotates the hue of each pixel of the image. angle is a double in the range + * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees + */ +void wxImage::RotateHue(double angle) +{ + AllocExclusive(); + + unsigned char *srcBytePtr; + unsigned char *dstBytePtr; + unsigned long count; + wxImage::HSVValue hsv; + wxImage::RGBValue rgb; + + wxASSERT (angle >= -1.0 && angle <= 1.0); + count = M_IMGDATA->m_width * M_IMGDATA->m_height; + if ( count > 0 && !wxIsNullDouble(angle) ) + { + srcBytePtr = M_IMGDATA->m_data; + dstBytePtr = srcBytePtr; + do + { + rgb.red = *srcBytePtr++; + rgb.green = *srcBytePtr++; + rgb.blue = *srcBytePtr++; + hsv = RGBtoHSV(rgb); + + hsv.hue = hsv.hue + angle; + if (hsv.hue > 1.0) + hsv.hue = hsv.hue - 1.0; + else if (hsv.hue < 0.0) + hsv.hue = hsv.hue + 1.0; + + rgb = HSVtoRGB(hsv); + *dstBytePtr++ = rgb.red; + *dstBytePtr++ = rgb.green; + *dstBytePtr++ = rgb.blue; + } while (--count != 0); + } +} + //----------------------------------------------------------------------------- // wxImageHandler //----------------------------------------------------------------------------- @@ -1429,7 +2616,7 @@ bool wxImageHandler::CanRead( const wxString& name ) { if (wxFileExists(name)) { - wxFileInputStream stream(name); + wxImageFileInputStream stream(name); return CanRead(stream); } @@ -1440,7 +2627,7 @@ bool wxImageHandler::CanRead( const wxString& name ) bool wxImageHandler::CallDoCanRead(wxInputStream& stream) { - off_t posOld = stream.TellI(); + wxFileOffset posOld = stream.TellI(); if ( posOld == wxInvalidOffset ) { // can't test unseekable stream @@ -1463,6 +2650,42 @@ bool wxImageHandler::CallDoCanRead(wxInputStream& stream) #endif // wxUSE_STREAMS +/* static */ +wxImageResolution +wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y) +{ + wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, _T("NULL pointer") ); + + if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) && + image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) ) + { + *x = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX); + *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY); + } + else if ( image.HasOption(wxIMAGE_OPTION_RESOLUTION) ) + { + *x = + *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTION); + } + else // no resolution options specified + { + *x = + *y = 0; + + return wxIMAGE_RESOLUTION_NONE; + } + + // get the resolution unit too + int resUnit = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT); + if ( !resUnit ) + { + // this is the default + resUnit = wxIMAGE_RESOLUTION_INCHES; + } + + return (wxImageResolution)resUnit; +} + // ---------------------------------------------------------------------------- // image histogram stuff // ---------------------------------------------------------------------------- @@ -1491,7 +2714,7 @@ wxImageHistogram::FindFirstUnusedColour(unsigned char *r, b2++; if ( b2 >= 255 ) { - wxLogError(_("GetUnusedColour:: No Unused Color in image ") ); + wxLogError(_("No unused colour in image.") ); return false; } } @@ -1593,18 +2816,7 @@ unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const * Rotation code by Carlos Moreno */ -// GRG: I've removed wxRotationPoint - we already have wxRealPoint which -// does exactly the same thing. And I also got rid of wxRotationPixel -// bacause of potential problems in architectures where alignment -// is an issue, so I had to rewrite parts of the code. - -static const double gs_Epsilon = 1e-10; - -static inline int wxCint (double x) -{ - return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5); -} - +static const double wxROTATE_EPSILON = 1e-10; // Auxiliary function to rotate a point (x,y) with respect to point p0 // make it inline and use a straight return to facilitate optimization @@ -1612,32 +2824,53 @@ static inline int wxCint (double x) // repeating the time-consuming calls to these functions -- sin/cos can // be computed and stored in the calling function. -inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0) +static inline wxRealPoint +wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle, + const wxRealPoint& p0) { - return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle, - p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle); + return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle, + p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle); } -inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0) +static inline wxRealPoint +wxRotatePoint(double x, double y, double cos_angle, double sin_angle, + const wxRealPoint & p0) { - return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0); + return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0); } -wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const +wxImage wxImage::Rotate(double angle, + const wxPoint& centre_of_rotation, + bool interpolating, + wxPoint *offset_after_rotation) const { + // screen coordinates are a mirror image of "real" coordinates + angle = -angle; + + const bool has_alpha = HasAlpha(); + + const int w = GetWidth(); + const int h = GetHeight(); + int i; - angle = -angle; // screen coordinates are a mirror image of "real" coordinates // Create pointer-based array to accelerate access to wxImage's data - unsigned char ** data = new unsigned char * [GetHeight()]; - + unsigned char ** data = new unsigned char * [h]; data[0] = GetData(); + for (i = 1; i < h; i++) + data[i] = data[i - 1] + (3 * w); - for (i = 1; i < GetHeight(); i++) - data[i] = data[i - 1] + (3 * GetWidth()); + // Same for alpha channel + unsigned char ** alpha = NULL; + if (has_alpha) + { + alpha = new unsigned char * [h]; + alpha[0] = GetAlpha(); + for (i = 1; i < h; i++) + alpha[i] = alpha[i - 1] + w; + } // precompute coefficients for rotation formula - // (sine and cosine of the angle) const double cos_angle = cos(angle); const double sin_angle = sin(angle); @@ -1647,32 +2880,35 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y); - wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0); - wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0); - wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0); - wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0); + wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0); + wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0); + wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0); + wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0); - int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x))); - int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y))); - int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x))); - int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y))); + int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x))); + int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y))); + int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x))); + int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y))); - wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false); + // Create rotated image + wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false); + // With alpha channel + if (has_alpha) + rotated.SetAlpha(); if (offset_after_rotation != NULL) { - *offset_after_rotation = wxPoint (x1, y1); + *offset_after_rotation = wxPoint (x1a, y1a); } - // GRG: The rotated (destination) image is always accessed - // sequentially, so there is no need for a pointer-based - // array here (and in fact it would be slower). - // - unsigned char * dst = rotated.GetData(); + // the rotated (destination) image is always accessed sequentially via this + // pointer, there is no need for pointer-based arrays here + unsigned char *dst = rotated.GetData(); - // GRG: if the original image has a mask, use its RGB values - // as the blank pixel, else, fall back to default (black). - // + unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL; + + // if the original image has a mask, use its RGB values as the blank pixel, + // else, fall back to default (black). unsigned char blank_r = 0; unsigned char blank_g = 0; unsigned char blank_b = 0; @@ -1689,46 +2925,45 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i // performing an inverse rotation (a rotation of -angle) and getting the // pixel at those coordinates - // GRG: I've taken the (interpolating) test out of the loops, so that - // it is done only once, instead of repeating it for each pixel. + const int rH = rotated.GetHeight(); + const int rW = rotated.GetWidth(); - int x; + // do the (interpolating) test outside of the loops, so that it is done + // only once, instead of repeating it for each pixel. if (interpolating) { - for (int y = 0; y < rotated.GetHeight(); y++) + for (int y = 0; y < rH; y++) { - for (x = 0; x < rotated.GetWidth(); x++) + for (int x = 0; x < rW; x++) { - wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0); + wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0); - if (-0.25 < src.x && src.x < GetWidth() - 0.75 && - -0.25 < src.y && src.y < GetHeight() - 0.75) + if (-0.25 < src.x && src.x < w - 0.75 && + -0.25 < src.y && src.y < h - 0.75) { // interpolate using the 4 enclosing grid-points. Those // points can be obtained using floor and ceiling of the // exact coordinates of the point - // C.M. 2000-02-17: when the point is near the border, special care is required. - int x1, y1, x2, y2; - if (0 < src.x && src.x < GetWidth() - 1) + if (0 < src.x && src.x < w - 1) { - x1 = wxCint(floor(src.x)); - x2 = wxCint(ceil(src.x)); + x1 = wxRound(floor(src.x)); + x2 = wxRound(ceil(src.x)); } else // else means that x is near one of the borders (0 or width-1) { - x1 = x2 = wxCint (src.x); + x1 = x2 = wxRound (src.x); } - if (0 < src.y && src.y < GetHeight() - 1) + if (0 < src.y && src.y < h - 1) { - y1 = wxCint(floor(src.y)); - y2 = wxCint(ceil(src.y)); + y1 = wxRound(floor(src.y)); + y2 = wxRound(ceil(src.y)); } else { - y1 = y2 = wxCint (src.y); + y1 = y2 = wxRound (src.y); } // get four points and the distances (square of the distance, @@ -1737,7 +2972,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i // GRG: Do not calculate the points until they are // really needed -- this way we can calculate // just one, instead of four, if d1, d2, d3 - // or d4 are < gs_Epsilon + // or d4 are < wxROTATE_EPSILON const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1); const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1); @@ -1750,33 +2985,46 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i // If the point is exactly at one point of the grid of the source // image, then don't interpolate -- just assign the pixel - if (d1 < gs_Epsilon) // d1,d2,d3,d4 are positive -- no need for abs() + // d1,d2,d3,d4 are positive -- no need for abs() + if (d1 < wxROTATE_EPSILON) { unsigned char *p = data[y1] + (3 * x1); *(dst++) = *(p++); *(dst++) = *(p++); - *(dst++) = *(p++); + *(dst++) = *p; + + if (has_alpha) + *(alpha_dst++) = *(alpha[y1] + x1); } - else if (d2 < gs_Epsilon) + else if (d2 < wxROTATE_EPSILON) { unsigned char *p = data[y1] + (3 * x2); *(dst++) = *(p++); *(dst++) = *(p++); - *(dst++) = *(p++); + *(dst++) = *p; + + if (has_alpha) + *(alpha_dst++) = *(alpha[y1] + x2); } - else if (d3 < gs_Epsilon) + else if (d3 < wxROTATE_EPSILON) { unsigned char *p = data[y2] + (3 * x2); *(dst++) = *(p++); *(dst++) = *(p++); - *(dst++) = *(p++); + *(dst++) = *p; + + if (has_alpha) + *(alpha_dst++) = *(alpha[y2] + x2); } - else if (d4 < gs_Epsilon) + else if (d4 < wxROTATE_EPSILON) { unsigned char *p = data[y2] + (3 * x1); *(dst++) = *(p++); *(dst++) = *(p++); - *(dst++) = *(p++); + *(dst++) = *p; + + if (has_alpha) + *(alpha_dst++) = *(alpha[y2] + x1); } else { @@ -1799,9 +3047,22 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i w3 * *(v3++) + w4 * *(v4++)) / (w1 + w2 + w3 + w4) ); *(dst++) = (unsigned char) - ( (w1 * *(v1++) + w2 * *(v2++) + - w3 * *(v3++) + w4 * *(v4++)) / + ( (w1 * *v1 + w2 * *v2 + + w3 * *v3 + w4 * *v4) / (w1 + w2 + w3 + w4) ); + + if (has_alpha) + { + v1 = alpha[y1] + (x1); + v2 = alpha[y1] + (x2); + v3 = alpha[y2] + (x2); + v4 = alpha[y2] + (x1); + + *(alpha_dst++) = (unsigned char) + ( (w1 * *v1 + w2 * *v2 + + w3 * *v3 + w4 * *v4) / + (w1 + w2 + w3 + w4) ); + } } } else @@ -1809,40 +3070,49 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i *(dst++) = blank_r; *(dst++) = blank_g; *(dst++) = blank_b; + + if (has_alpha) + *(alpha_dst++) = 0; } } } } - else // not interpolating + else // not interpolating { - for (int y = 0; y < rotated.GetHeight(); y++) + for (int y = 0; y < rH; y++) { - for (x = 0; x < rotated.GetWidth(); x++) + for (int x = 0; x < rW; x++) { - wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0); + wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0); - const int xs = wxCint (src.x); // wxCint rounds to the - const int ys = wxCint (src.y); // closest integer + const int xs = wxRound (src.x); // wxRound rounds to the + const int ys = wxRound (src.y); // closest integer - if (0 <= xs && xs < GetWidth() && - 0 <= ys && ys < GetHeight()) + if (0 <= xs && xs < w && 0 <= ys && ys < h) { unsigned char *p = data[ys] + (3 * xs); *(dst++) = *(p++); *(dst++) = *(p++); - *(dst++) = *(p++); + *(dst++) = *p; + + if (has_alpha) + *(alpha_dst++) = *(alpha[ys] + (xs)); } else { *(dst++) = blank_r; *(dst++) = blank_g; *(dst++) = blank_b; + + if (has_alpha) + *(alpha_dst++) = 255; } } } } delete [] data; + delete [] alpha; return rotated; } @@ -1860,8 +3130,8 @@ class wxImageModule: public wxModule DECLARE_DYNAMIC_CLASS(wxImageModule) public: wxImageModule() {} - bool OnInit() { wxImage::InitStandardHandlers(); return true; }; - void OnExit() { wxImage::CleanUpHandlers(); }; + bool OnInit() { wxImage::InitStandardHandlers(); return true; } + void OnExit() { wxImage::CleanUpHandlers(); } }; IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)