X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/978d3d3647fde4362cfe8b7b2b505ba1cc52770a..d68d85908b4f6073ae1c100abe3d9469fcd451d9:/src/common/image.cpp

diff --git a/src/common/image.cpp b/src/common/image.cpp
index 29562c0ebe..64f367c521 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
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "image.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -18,25 +14,26 @@
     #pragma hdrstop
 #endif
 
-#include "wx/defs.h"
-
 #if wxUSE_IMAGE
 
+#ifndef WX_PRECOMP
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/hash.h"
+    #include "wx/utils.h"
+#endif
+
 #include "wx/image.h"
 #include "wx/bitmap.h"
 #include "wx/debug.h"
-#include "wx/log.h"
-#include "wx/app.h"
 #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/math.h"
 
 #if wxUSE_XPM
-#include "wx/xpmdecod.h"
+    #include "wx/xpmdecod.h"
 #endif
 
 // For memcpy
@@ -152,17 +149,6 @@ wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 }
 #endif // wxUSE_STREAMS
 
-wxImage::wxImage( const wxImage& image )
-    : wxObject()
-{
-    Ref(image);
-}
-
-wxImage::wxImage( const wxImage* image )
-{
-    if (image) Ref(*image);
-}
-
 wxImage::wxImage( const char** xpmData )
 {
     Create(xpmData);
@@ -266,8 +252,17 @@ wxImage wxImage::Copy() const
 
     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 
-    // also copy the image options
     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
+
+    // also copy the alpha channel
+    if (HasAlpha())
+    {
+        image.SetAlpha();
+        unsigned char* alpha = image.GetAlpha();
+        memcpy( alpha, GetAlpha(), M_IMGDATA->m_width*M_IMGDATA->m_height );
+    }
+
+    // also copy the image options
     imgData->m_optionNames = M_IMGDATA->m_optionNames;
     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 
@@ -384,7 +379,7 @@ 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);
@@ -470,7 +465,7 @@ wxImage wxImage::Scale( int width, int height ) const
         y += y_delta;
     }
 
-    // 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);
@@ -555,9 +550,16 @@ 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 );
 
@@ -580,6 +582,25 @@ 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
     {
@@ -589,6 +610,23 @@ 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;
@@ -600,32 +638,47 @@ 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;
@@ -655,6 +708,10 @@ wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 
     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);
 
@@ -773,6 +830,46 @@ 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);
+        }
+    }
+
+    return image;
+}
+
 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 {
     wxImage image;
@@ -1558,7 +1655,13 @@ bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
         return false;
     }
 
-    return handler->LoadFile(this, stream, true/*verbose*/, index);
+    if (stream.IsSeekable() && !handler->CanRead(stream))
+    {
+        wxLogError(_("Image file is not of type %d."), type);
+        return false;
+    }
+    else
+        return handler->LoadFile(this, stream, true/*verbose*/, index);
 }
 
 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
@@ -1576,7 +1679,13 @@ 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."), (const wxChar*) mimetype);
+        return false;
+    }
+    else
+        return handler->LoadFile( this, stream, true/*verbose*/, index );
 }
 
 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
@@ -1755,29 +1864,36 @@ wxString wxImage::GetImageExtWildcard()
 
 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
 {
-    double hue, saturation, value;
-
     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)
+    if ( green < minimumRGB )
         minimumRGB = green;
-
-    if (blue < minimumRGB)
+    if ( blue < minimumRGB )
         minimumRGB = blue;
 
+    enum { RED, GREEN, BLUE } chMax = RED;
     double maximumRGB = red;
-    if (green > maximumRGB)
+    if ( green > maximumRGB )
+    {
+        chMax = GREEN;
         maximumRGB = green;
-
-    if (blue > maximumRGB)
+    }
+    if ( blue > maximumRGB )
+    {
+        chMax = BLUE;
         maximumRGB = blue;
+    }
 
-    value = maximumRGB;
+    const double value = maximumRGB;
 
-    if (maximumRGB == minimumRGB)
+    double hue = 0.0, saturation;
+    const double deltaRGB = maximumRGB - minimumRGB;
+    if ( wxIsNullDouble(deltaRGB) )
     {
         // Gray has no color
         hue = 0.0;
@@ -1785,21 +1901,31 @@ wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
     }
     else
     {
-        double deltaRGB = maximumRGB - minimumRGB;
+        switch ( chMax )
+        {
+            case RED:
+                hue = (green - blue) / deltaRGB;
+                break;
 
-        saturation = deltaRGB / maximumRGB;
+            case GREEN:
+                hue = 2.0 + (blue - red) / deltaRGB;
+                break;
 
-        if ( red == maximumRGB )
-            hue = (green - blue) / deltaRGB;
-        else if (green == maximumRGB)
-            hue = 2.0 + (blue - red) / deltaRGB;
-        else
-            hue = 4.0 + (red - green) / deltaRGB;
+            case BLUE:
+                hue = 4.0 + (red - green) / deltaRGB;
+                break;
 
-        hue = hue / 6.0;
+            default:
+                wxFAIL_MSG(wxT("hue not specified"));
+                break;
+        }
+
+        hue /= 6.0;
 
-        if (hue < 0.0)
-            hue = hue + 1.0;
+        if ( hue < 0.0 )
+            hue += 1.0;
+
+        saturation = deltaRGB / maximumRGB;
     }
 
     return HSVValue(hue, saturation, value);
@@ -1809,13 +1935,14 @@ wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
 {
     double red, green, blue;
 
-    if ( hsv.saturation == 0.0 )
+    if ( wxIsNullDouble(hsv.saturation) )
     {
-        red = hsv.value; //Grey
+        // Grey
+        red = hsv.value;
         green = hsv.value;
-        blue = hsv.value; 
+        blue = hsv.value;
     }
-    else
+    else // not grey
     {
         double hue = hsv.hue * 6.0;      // sector 0 to 5
         int i = (int)floor(hue);
@@ -1879,9 +2006,9 @@ void wxImage::RotateHue(double angle)
     wxImage::HSVValue hsv;
     wxImage::RGBValue rgb;
 
-    assert (angle >= -1.0 && angle <= 1.0);
+    wxASSERT (angle >= -1.0 && angle <= 1.0);
     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
-    if (count > 0 && angle != 0.0)
+    if ( count > 0 && !wxIsNullDouble(angle) )
     {
         srcBytePtr = M_IMGDATA->m_data;
         dstBytePtr = srcBytePtr;
@@ -2165,20 +2292,20 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), 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)));
 
     // Create rotated image
-    wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
+    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
@@ -2220,7 +2347,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
         {
             for (x = 0; x < rotated.GetWidth(); x++)
             {
-                wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
+                wxRealPoint src = rotated_point (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)
@@ -2228,8 +2355,6 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                     // 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)
@@ -2279,10 +2404,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y1] + x1;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y1] + x1);
                     }
                     else if (d2 < gs_Epsilon)
                     {
@@ -2292,10 +2414,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y1] + x2;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y1] + x2);
                     }
                     else if (d3 < gs_Epsilon)
                     {
@@ -2305,10 +2424,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y2] + x2;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y2] + x2);
                     }
                     else if (d4 < gs_Epsilon)
                     {
@@ -2318,10 +2434,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y2] + x1;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y2] + x1);
                     }
                     else
                     {
@@ -2350,10 +2463,10 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
 
                         if (has_alpha)
                         {
-                            unsigned char *v1 = alpha[y1] + (x1);
-                            unsigned char *v2 = alpha[y1] + (x2);
-                            unsigned char *v3 = alpha[y2] + (x2);
-                            unsigned char *v4 = alpha[y2] + (x1);
+                            v1 = alpha[y1] + (x1);
+                            v2 = alpha[y1] + (x2);
+                            v3 = alpha[y2] + (x2);
+                            v4 = alpha[y2] + (x1);
 
                             *(alpha_dst++) = (unsigned char)
                                 ( (w1 * *v1 + w2 * *v2 +
@@ -2380,7 +2493,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
         {
             for (x = 0; x < rotated.GetWidth(); x++)
             {
-                wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
+                wxRealPoint src = rotated_point (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
@@ -2394,10 +2507,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                     *(dst++) = *p;
 
                     if (has_alpha)
-                    {
-                        unsigned char *p = alpha[ys] + (xs);
-                        *(alpha_dst++) = *p;
-                    }
+                        *(alpha_dst++) = *(alpha[ys] + (xs));
                 }
                 else
                 {