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Use consistently signed stride types.

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The stride can be negative when asked for a flipped image.

Change-Id: I049e8027c769186274a6a3049949f3fcaae7d2e9
This commit is contained in:
Vincent Rabaud
2025-01-30 00:12:28 +01:00
parent 654bfb040c
commit 7ed2b10ef0
2 changed files with 25 additions and 22 deletions
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7
src/dec/vp8l_dec.c
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@ -13,6 +13,7 @@
// Jyrki Alakuijala (jyrki@google.com)
#include <assert.h>
#include <stddef.h>
#include <stdlib.h>
#include "src/dec/alphai_dec.h"
@ -624,8 +625,8 @@ static int EmitRescaledRowsRGBA(const VP8LDecoder* const dec,
int num_lines_in = 0;
int num_lines_out = 0;
while (num_lines_in < mb_h) {
uint8_t* const row_in = in + (uint64_t)num_lines_in * in_stride;
uint8_t* const row_out = out + (uint64_t)num_lines_out * out_stride;
uint8_t* const row_in = in + (ptrdiff_t)num_lines_in * in_stride;
uint8_t* const row_out = out + (ptrdiff_t)num_lines_out * out_stride;
const int lines_left = mb_h - num_lines_in;
const int needed_lines = WebPRescaleNeededLines(dec->rescaler, lines_left);
int lines_imported;
@ -827,7 +828,7 @@ static void ProcessRows(VP8LDecoder* const dec, int row) {
if (WebPIsRGBMode(output->colorspace)) { // convert to RGBA
const WebPRGBABuffer* const buf = &output->u.RGBA;
uint8_t* const rgba =
buf->rgba + (int64_t)dec->last_out_row_ * buf->stride;
buf->rgba + (ptrdiff_t)dec->last_out_row_ * buf->stride;
const int num_rows_out =
#if !defined(WEBP_REDUCE_SIZE)
io->use_scaling ?