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Optimization of ImageDrawRectangleRec() (#3185)

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A significant performance increase can be had by copying the first row to all other rows.
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smalltimewizard 2023-07-20 07:50:56 -04:00 committed by GitHub
parent 5635e4214c
commit 1310617a92
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1 changed files with 16 additions and 14 deletions
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30
src/rtextures.c
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@ -3135,26 +3135,28 @@ void ImageDrawRectangleRec(Image *dst, Rectangle rec, Color color)
if (rec.height < 0) rec.height = 0;
int sy = (int)rec.y;
int ey = sy + (int)rec.height;
int sx = (int)rec.x;
int bytesPerPixel = GetPixelDataSize(1, 1, dst->format);
for (int y = sy; y < ey; y++)
// Fill in the first pixel of the first row based on image format
ImageDrawPixel(dst, sx, sy, color);
int bytesOffset = ((sy*dst->width) + sx)*bytesPerPixel;
unsigned char *pSrcPixel = (unsigned char *)dst->data + bytesOffset;
// Repeat the first pixel data throughout the row
for (int x = 1; x < (int)rec.width; x++)
{
// Fill in the first pixel of the row based on image format
ImageDrawPixel(dst, sx, y, color);
int bytesOffset = ((y*dst->width) + sx)*bytesPerPixel;
unsigned char *pSrcPixel = (unsigned char *)dst->data + bytesOffset;
// Repeat the first pixel data throughout the row
for (int x = 1; x < (int)rec.width; x++)
{
memcpy(pSrcPixel + x*bytesPerPixel, pSrcPixel, bytesPerPixel);
}
memcpy(pSrcPixel + x*bytesPerPixel, pSrcPixel, bytesPerPixel);
}
// Repeat the first row data for all other rows
int bytesPerRow = bytesPerPixel * (int)rec.width;
for (int y = 1; y < (int)rec.height; y++)
{
memcpy(pSrcPixel + (y*dst->width)*bytesPerPixel, pSrcPixel, bytesPerRow);
}
}
// Draw rectangle lines within an image