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Optimize converting internal GDI+ bitmap to wxImage

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Write retrieved pixel data directly to the internal buffers of destination wxImage.
This commit is contained in:
Artur Wieczorek
2016-01-03 15:10:16 +01:00
parent 3195bc14d0
commit ca8f5eae93
1 changed files with 6 additions and 4 deletions
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10
src/msw/graphics.cpp
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@@ -1118,16 +1118,18 @@ wxImage wxGDIPlusBitmapData::ConvertToImage() const
Rect rect(0, 0, w, h);
m_bitmap->LockBits(&rect, ImageLockModeRead, PixelFormat32bppARGB, &bitmapData);
unsigned char *imgRGB = img.GetData(); // destination RGB buffer
unsigned char *imgAlpha = img.GetAlpha(); // destination alpha buffer
const BYTE* pixels = static_cast<const BYTE*>(bitmapData.Scan0);
for( UINT y = 0; y < h; y++ )
{
for( UINT x = 0; x < w; x++ )
{
ARGB c = reinterpret_cast<const ARGB*>(pixels)[x];
img.SetRGB(x, y, (c >> 16) & 0xFF,
(c >> 8) & 0xFF,
(c >> 0) & 0xFF);
img.SetAlpha(x, y, (c >> 24) & 0xFF);
*imgRGB++ = (c >> 16) & 0xFF; // R
*imgRGB++ = (c >> 8) & 0xFF; // G
*imgRGB++ = (c >> 0) & 0xFF; // B
*imgAlpha++ = (c >> 24) & 0xFF;
}
pixels += bitmapData.Stride;