X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9a83f860948059b0273b5cc6d9e43fadad3ebfca..af7e24c33e1e6e00a7687ee965b921dbe60cdb36:/src/common/image.cpp?ds=sidebyside diff --git a/src/common/image.cpp b/src/common/image.cpp index 5ae109c97a..cc63e385c1 100644 --- a/src/common/image.cpp +++ b/src/common/image.cpp @@ -26,6 +26,7 @@ #include "wx/module.h" #include "wx/palette.h" #include "wx/intl.h" + #include "wx/colour.h" #endif #include "wx/filefn.h" @@ -384,7 +385,8 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const return image; } -wxImage wxImage::Scale( int width, int height, int quality ) const +wxImage +wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const { wxImage image; @@ -404,78 +406,32 @@ wxImage wxImage::Scale( int width, int height, int quality ) const 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 ) - { - // 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); - } - } - 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(); - - wxCHECK_MSG( data, image, wxT("unable to create image") ); - - 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 ) - { - source_alpha = M_IMGDATA->m_alpha ; - if ( source_alpha ) + // resample the image using either the nearest neighbourhood, bilinear or + // bicubic method as specified + switch ( quality ) + { + case wxIMAGE_QUALITY_BICUBIC: + case wxIMAGE_QUALITY_BILINEAR: + // both of these algorithms should be used for up-sampling the + // image only, when down-sampling always use box averaging for best + // results + if ( width < old_width && height < old_height ) + image = ResampleBox(width, height); + else if ( quality == wxIMAGE_QUALITY_BILINEAR ) + image = ResampleBilinear(width, height); + else if ( quality == wxIMAGE_QUALITY_BICUBIC ) + image = ResampleBicubic(width, height); + break; + + case wxIMAGE_QUALITY_NEAREST: + if ( old_width % width == 0 && old_width >= width && + old_height % height == 0 && old_height >= height ) { - image.SetAlpha() ; - target_alpha = image.GetAlpha() ; + return ShrinkBy( old_width / width , old_height / height ); } - } - - long x_delta = (old_width<<16) / width; - long y_delta = (old_height<<16) / height; - - unsigned char* dest_pixel = target_data; - - long y = 0; - for ( long j = 0; j < height; j++ ) - { - 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]; - 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; - } + image = ResampleNearest(width, height); + break; } // If the original image has a mask, apply the mask to the new image @@ -497,6 +453,63 @@ wxImage wxImage::Scale( int width, int height, int quality ) const return image; } +wxImage wxImage::ResampleNearest(int width, int height) const +{ + wxImage image; + image.Create( width, height, false ); + + unsigned char *data = image.GetData(); + + wxCHECK_MSG( data, image, wxT("unable to create image") ); + + 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 ) + { + source_alpha = M_IMGDATA->m_alpha ; + if ( source_alpha ) + { + image.SetAlpha() ; + target_alpha = image.GetAlpha() ; + } + } + + long old_height = M_IMGDATA->m_height, + old_width = M_IMGDATA->m_width; + long x_delta = (old_width<<16) / width; + long y_delta = (old_height<<16) / height; + + unsigned char* dest_pixel = target_data; + + long y = 0; + for ( long j = 0; j < height; j++ ) + { + 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]; + 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; + } + + return image; +} + wxImage wxImage::ResampleBox(int width, int height) const { // This function implements a simple pre-blur/box averaging method for @@ -582,6 +595,92 @@ wxImage wxImage::ResampleBox(int width, int height) const return ret_image; } +wxImage wxImage::ResampleBilinear(int width, int height) const +{ + // This function implements a Bilinear algorithm for resampling. + wxImage ret_image(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(); + } + double HFactor = double(M_IMGDATA->m_height) / height; + double WFactor = double(M_IMGDATA->m_width) / width; + + int srcpixymax = M_IMGDATA->m_height - 1; + int srcpixxmax = M_IMGDATA->m_width - 1; + + double srcpixy, srcpixy1, srcpixy2, dy, dy1; + double srcpixx, srcpixx1, srcpixx2, dx, dx1; + + // initialize alpha values to avoid g++ warnings about possibly + // uninitialized variables + double r1, g1, b1, a1 = 0; + double r2, g2, b2, a2 = 0; + + for ( int dsty = 0; dsty < height; dsty++ ) + { + // We need to calculate the source pixel to interpolate from - Y-axis + srcpixy = double(dsty) * HFactor; + srcpixy1 = int(srcpixy); + srcpixy2 = ( srcpixy1 == srcpixymax ) ? srcpixy1 : srcpixy1 + 1.0; + dy = srcpixy - (int)srcpixy; + dy1 = 1.0 - dy; + + + for ( int dstx = 0; dstx < width; dstx++ ) + { + // X-axis of pixel to interpolate from + srcpixx = double(dstx) * WFactor; + srcpixx1 = int(srcpixx); + srcpixx2 = ( srcpixx1 == srcpixxmax ) ? srcpixx1 : srcpixx1 + 1.0; + dx = srcpixx - (int)srcpixx; + dx1 = 1.0 - dx; + + int x_offset1 = srcpixx1 < 0.0 ? 0 : srcpixx1 > srcpixxmax ? srcpixxmax : (int)srcpixx1; + int x_offset2 = srcpixx2 < 0.0 ? 0 : srcpixx2 > srcpixxmax ? srcpixxmax : (int)srcpixx2; + int y_offset1 = srcpixy1 < 0.0 ? 0 : srcpixy1 > srcpixymax ? srcpixymax : (int)srcpixy1; + int y_offset2 = srcpixy2 < 0.0 ? 0 : srcpixy2 > srcpixymax ? srcpixymax : (int)srcpixy2; + + int src_pixel_index00 = y_offset1 * M_IMGDATA->m_width + x_offset1; + int src_pixel_index01 = y_offset1 * M_IMGDATA->m_width + x_offset2; + int src_pixel_index10 = y_offset2 * M_IMGDATA->m_width + x_offset1; + int src_pixel_index11 = y_offset2 * M_IMGDATA->m_width + x_offset2; + + //first line + r1 = src_data[src_pixel_index00 * 3 + 0] * dx1 + src_data[src_pixel_index01 * 3 + 0] * dx; + g1 = src_data[src_pixel_index00 * 3 + 1] * dx1 + src_data[src_pixel_index01 * 3 + 1] * dx; + b1 = src_data[src_pixel_index00 * 3 + 2] * dx1 + src_data[src_pixel_index01 * 3 + 2] * dx; + if ( src_alpha ) + a1 = src_alpha[src_pixel_index00] * dx1 + src_alpha[src_pixel_index01] * dx; + + //second line + r2 = src_data[src_pixel_index10 * 3 + 0] * dx1 + src_data[src_pixel_index11 * 3 + 0] * dx; + g2 = src_data[src_pixel_index10 * 3 + 1] * dx1 + src_data[src_pixel_index11 * 3 + 1] * dx; + b2 = src_data[src_pixel_index10 * 3 + 2] * dx1 + src_data[src_pixel_index11 * 3 + 2] * dx; + if ( src_alpha ) + a2 = src_alpha[src_pixel_index10] * dx1 + src_alpha[src_pixel_index11] * dx; + + //result lines + + dst_data[0] = static_cast(r1 * dy1 + r2 * dy); + dst_data[1] = static_cast(g1 * dy1 + g2 * dy); + dst_data[2] = static_cast(b1 * dy1 + b2 * dy); + dst_data += 3; + + if ( src_alpha ) + *dst_alpha++ = static_cast(a1 * dy1 + a2 * dy); + } + } + + 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) @@ -1184,21 +1283,30 @@ wxImage wxImage::Size( const wxSize& size, const wxPoint& pos, 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; + // we have two coordinate systems: + // source: starting at 0,0 of source image + // destination starting at 0,0 of destination image + // Documentation says: + // "The image is pasted into a new image [...] at the position pos relative + // to the upper left of the new image." this means the transition rule is: + // "dest coord" = "source coord" + pos; - subRect.Intersect(finalRect); + // calculate the intersection using source coordinates: + wxRect srcRect(0, 0, width, height); + wxRect dstRect(-pos, size); - if (!subRect.IsEmpty()) + srcRect.Intersect(dstRect); + + if (!srcRect.IsEmpty()) { - if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height)) - image.Paste(*this, pos.x, pos.y); + // insertion point is needed in destination coordinates. + // NB: it is not always "pos"! + wxPoint ptInsert = srcRect.GetTopLeft() + pos; + + if ((srcRect.GetWidth() == width) && (srcRect.GetHeight() == height)) + image.Paste(*this, ptInsert.x, ptInsert.y); else - image.Paste(GetSubImage(subRect), pos.x, pos.y); + image.Paste(GetSubImage(srcRect), ptInsert.x, ptInsert.y); } return image; @@ -1329,7 +1437,12 @@ void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1, } } -wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const +wxImage wxImage::ConvertToGreyscale(void) const +{ + return ConvertToGreyscale(0.299, 0.587, 0.114); +} + +wxImage wxImage::ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const { wxImage image; @@ -1353,16 +1466,14 @@ wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const const long size = M_IMGDATA->m_width * M_IMGDATA->m_height; for ( long i = 0; i < size; i++, src += 3, dest += 3 ) { + memcpy(dest, src, 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] = static_cast(luma); + wxColour::MakeGrey(dest + 0, dest + 1, dest + 2, weight_r, weight_g, weight_b); } } @@ -1407,15 +1518,43 @@ wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char for ( long i = 0; i < size; i++, srcd += 3, tard += 3 ) { - if (srcd[0] == r && srcd[1] == g && srcd[2] == b) - tard[0] = tard[1] = tard[2] = 255; - else - tard[0] = tard[1] = tard[2] = 0; + bool on = (srcd[0] == r) && (srcd[1] == g) && (srcd[2] == b); + wxColourBase::MakeMono(tard + 0, tard + 1, tard + 2, on); } return image; } +wxImage wxImage::ConvertToDisabled(unsigned char brightness) const +{ + wxImage image = *this; + + unsigned char mr = image.GetMaskRed(); + unsigned char mg = image.GetMaskGreen(); + unsigned char mb = image.GetMaskBlue(); + + int width = image.GetWidth(); + int height = image.GetHeight(); + bool has_mask = image.HasMask(); + + for (int y = height-1; y >= 0; --y) + { + for (int x = width-1; x >= 0; --x) + { + unsigned char* data = image.GetData() + (y*(width*3))+(x*3); + unsigned char* r = data; + unsigned char* g = data+1; + unsigned char* b = data+2; + + if (has_mask && (*r == mr) && (*g == mg) && (*b == mb)) + continue; + + wxColour::MakeDisabled(r, g, b, brightness); + } + } + return image; +} + int wxImage::GetWidth() const { wxCHECK_MSG( Ok(), 0, wxT("invalid image") ); @@ -2698,7 +2837,7 @@ bool wxImageHandler::CallDoCanRead(wxInputStream& stream) { // NOTE: this code is the same of wxAnimationDecoder::CanRead and // wxImageHandler::GetImageCount - + if ( !stream.IsSeekable() ) return false; // can't test unseekable stream