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Faster version of ImageClearBackground and ImageDrawRectangleRec (#1487)

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* Don't use DrawRect to clear an image, a pixel loop is an order of magnitude faster.

* Update ImageDrawRectangle to be faster too.
This commit is contained in:
Jeffery Myers
2020-12-29 11:39:53 -08:00
committed by GitHub
parent 75c6fd047b
commit 59bb759855
1 changed files with 15 additions and 4 deletions
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19
src/textures.c
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@@ -2348,7 +2348,8 @@ Rectangle GetImageAlphaBorder(Image image, float threshold)
// Clear image background with given color // Clear image background with given color
void ImageClearBackground(Image *dst, Color color) void ImageClearBackground(Image *dst, Color color)
{ {
ImageDrawRectangle(dst, 0, 0, dst->width, dst->height, color); for (int i = 0; i < dst->width * dst->height; ++i)
ImageDrawPixel(dst, i % dst->width, i / dst->height, color);
} }
// Draw pixel within an image // Draw pixel within an image
@@ -2546,9 +2547,19 @@ void ImageDrawRectangleRec(Image *dst, Rectangle rec, Color color)
// Security check to avoid program crash // Security check to avoid program crash
if ((dst->data == NULL) || (dst->width == 0) || (dst->height == 0)) return; if ((dst->data == NULL) || (dst->width == 0) || (dst->height == 0)) return;
Image imRec = GenImageColor((int)rec.width, (int)rec.height, color); int sy = (int)rec.y;
ImageDraw(dst, imRec, (Rectangle){ 0, 0, rec.width, rec.height }, rec, WHITE); int ey = sy + (int)rec.height;
UnloadImage(imRec);
int sx = (int)rec.x;
int ex = sx + (int)rec.width;
for (int y = sy; y < ey; y++)
{
for (int x = sx; x < ex; x++)
{
ImageDrawPixel(dst, x, y, color);
}
}
} }
// Draw rectangle lines within an image // Draw rectangle lines within an image