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prevent Valgrind errors about using uninitialized memory

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This commit is contained in:
Yay295 2022-08-26 21:20:07 -05:00
parent 13e3120925
commit b178d1621a
1 changed files with 13 additions and 1 deletions
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14
src/libImaging/Storage.c
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@ -381,7 +381,7 @@ ImagingDestroyArray(Imaging im) {
Imaging
ImagingAllocateArray(Imaging im, int dirty, int block_size) {
int y, line_in_block, current_block;
int y, x, line_in_block, current_block;
ImagingMemoryArena arena = &ImagingDefaultArena;
ImagingMemoryBlock block = {NULL, 0};
int aligned_linesize, lines_per_block, blocks_count;
@ -442,6 +442,18 @@ ImagingAllocateArray(Imaging im, int dirty, int block_size) {
im->destroy = ImagingDestroyArray;
/* Zero-out the unused bytes for image modes that
only use 3 of 4 bytes to prevent Valgrind errors */
if (dirty && im->bands == 3 && im->pixelsize == 4) {
for (y = 0; y < im->ysize; y++) {
char *line = im->image[y] + 3;
for (x = 0; x < im->xsize; x++) {
*line = 0;
line += 4;
}
}
}
return im;
}