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stb_image; optimize row computation in PR

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This commit is contained in:
Sean Barrett 2019-02-07 06:58:00 -08:00
parent b2bde485a2
commit e5d4d6fcce
1 changed files with 6 additions and 6 deletions
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12
stb_image_write.h
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@ -1469,15 +1469,15 @@ static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, in
for(x = 0; x < width; x += 8) {
float YDU[64], UDU[64], VDU[64];
for(row = y, pos = 0; row < y+8; ++row) {
if(row < height) {
p = (stbi__flip_vertically_on_write ? (height-1-row) : row)*width*comp;
} else {
// row >= height => use last input row (=> first if flipping)
p = stbi__flip_vertically_on_write ? 0 : ((height-1)*width*comp);
}
for(col = x; col < x+8; ++col, ++pos) {
float r, g, b;
int p;
if(row < height) {
p = (stbi__flip_vertically_on_write ? (height-1-row) : row)*width*comp;
} else {
// row >= height => use last input row (=> first if flipping)
p = stbi__flip_vertically_on_write ? 0 : ((height-1)*width*comp);
}
// if col >= width => use pixel from last input column
p += ((col < width) ? col : (width-1))*comp;