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stb_image_write: Fix JPEG writer bug.

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This commit is contained in:
Fabian Giesen 2019-02-23 05:17:37 -08:00
parent 59e9702be5
commit 980add9725
1 changed files with 4 additions and 8 deletions
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12
stb_image_write.h
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@ -1476,17 +1476,13 @@ 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) {
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);
}
// row >= height => use last input row
int clamped_row = (row < height) ? row : height - 1;
int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp;
for(col = x; col < x+8; ++col, ++pos) {
float r, g, b;
// if col >= width => use pixel from last input column
p += ((col < width) ? col : (width-1))*comp;
int p = base_p + ((col < width) ? col : (width-1))*comp;
r = imageData[p+0];
g = imageData[p+ofsG];