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Minor performance tweak to the DIB creation loop

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This commit is contained in:
Carl Woffenden
2019-10-05 11:47:46 +02:00
parent a88ff8b9ac
commit 267e00addb
1 changed files with 5 additions and 7 deletions
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12
contrib/previewers/win/helpers.cpp
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@@ -41,13 +41,11 @@ HBITMAP rgbToBitmap(const uint32_t* src, uint32_t const imgW, uint32_t const img
*/
if (hbmp && pixels) {
uint32_t* dst = static_cast<uint32_t*>(pixels);
for (unsigned y = 0; y < imgH; y++) {
for (unsigned x = 0; x < imgW; x++) {
uint32_t rgba = *src++;
*dst++ = ((rgba & 0x000000FF) << 16)
| ((rgba & 0xFF00FF00) )
| ((rgba & 0x00FF0000) >> 16);
}
for (unsigned xy = imgW * imgH; xy > 0; xy--) {
uint32_t rgba = *src++;
*dst++ = ((rgba & 0x000000FF) << 16)
| ((rgba & 0xFF00FF00) )
| ((rgba & 0x00FF0000) >> 16);
}
GdiFlush();
}