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Fix: integer overflow scaling large images

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This commit is contained in:
Campbell Barton
2025-04-12 01:04:47 +00:00
parent 3f36ce297a
commit 309bdc491b
1 changed files with 5 additions and 5 deletions
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10
source/blender/imbuf/intern/scaling.cc
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@@ -343,7 +343,7 @@ static void alloc_scale_dst_buffers(
{
*r_dst_byte = nullptr;
if (ibuf->byte_buffer.data != nullptr) {
*r_dst_byte = MEM_malloc_arrayN<uchar4>(newx * newy, "scale_buf_byte");
*r_dst_byte = MEM_malloc_arrayN<uchar4>(size_t(newx) * size_t(newy), "scale_buf_byte");
if (*r_dst_byte == nullptr) {
return;
}
@@ -413,8 +413,8 @@ struct ScaleDownX {
const int grain_size = threaded ? 32 : ibufy;
threading::parallel_for(IndexRange(ibufy), grain_size, [&](IndexRange range) {
for (const int y : range) {
const T *src_ptr = src + y * ibufx;
T *dst_ptr = dst + y * newx;
const T *src_ptr = src + (int64_t(y) * ibufx);
T *dst_ptr = dst + (int64_t(y) * newx);
float sample = 0.0f;
float4 val(0.0f);
@@ -502,8 +502,8 @@ struct ScaleUpX {
for (const int y : range) {
float sample = -0.5f + add * 0.5f;
int counter = 0;
const T *src_ptr = src + y * ibufx;
T *dst_ptr = dst + y * newx;
const T *src_ptr = src + (int64_t(y) * ibufx);
T *dst_ptr = dst + (int64_t(y) * newx);
float4 val = load_pixel(src_ptr);
float4 nval = load_pixel(src_ptr + 1);
float4 diff = nval - val;