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Faster imagescale code

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Blit() rewritten


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1585 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling
1999-02-04 06:51:39 +00:00
parent cf45d1f4b3
commit 6e13c1965f
4 changed files with 358 additions and 158 deletions
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22
src/common/image.cpp
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@@ -163,18 +163,22 @@ wxImage wxImage::Scale( int width, int height )
if (M_IMGDATA->m_hasMask)
image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
double xscale = (double)width / (double)M_IMGDATA->m_width;
double yscale = (double)height / (double)M_IMGDATA->m_height;
long old_height = M_IMGDATA->m_height;
long old_width = M_IMGDATA->m_width;
for (int j = 0; j < height; j++)
char unsigned *source_data = M_IMGDATA->m_data;
char unsigned *target_data = data;
for (long j = 0; j < height; j++)
{
for (int i = 0; i < width; i++)
long y_offset = (j * old_height / height) * old_width;
for (long i = 0; i < width; i++)
{
int new_pos = 3*(j*width + i);
int old_pos = 3*((long)(j/yscale)*M_IMGDATA->m_width + (long)(i/xscale));
data[ new_pos ] = M_IMGDATA->m_data[ old_pos ];
data[ new_pos+1 ] = M_IMGDATA->m_data[ old_pos+1 ];
data[ new_pos+2 ] = M_IMGDATA->m_data[ old_pos+2 ];
memcpy( target_data,
source_data + 3*(y_offset + ((i * old_width )/ width)),
3 );
target_data += 3;
}
}