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WebPDecodeYUV: check u/v/stride/uv_stride ptrs

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The buffers are made mandatory to match WebPDecodeYUVInto(), though this
conflicts with WebPIDecGetYUVA().

spotted by Oliver Kunz (okunz at google dot com)

Change-Id: Ic4740c53b75da6b93d4f3462303fb9be0ebfbd48
This commit is contained in:
James Zern 2023-06-12 22:04:33 +00:00
parent 8e965ccb0f
commit 59a2b1f9e3
2 changed files with 22 additions and 14 deletions
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31
src/dec/webp_dec.c
View File

@ -658,19 +658,26 @@ uint8_t* WebPDecodeBGRA(const uint8_t* data, size_t data_size,
uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
int* width, int* height, uint8_t** u, uint8_t** v,
int* stride, int* uv_stride) {
WebPDecBuffer output; // only to preserve the side-infos
uint8_t* const out = Decode(MODE_YUV, data, data_size,
width, height, &output);
if (out != NULL) {
const WebPYUVABuffer* const buf = &output.u.YUVA;
*u = buf->u;
*v = buf->v;
*stride = buf->y_stride;
*uv_stride = buf->u_stride;
assert(buf->u_stride == buf->v_stride);
// data, width and height are checked by Decode().
if (u == NULL || v == NULL || stride == NULL || uv_stride == NULL) {
return NULL;
}
{
WebPDecBuffer output; // only to preserve the side-infos
uint8_t* const out = Decode(MODE_YUV, data, data_size,
width, height, &output);
if (out != NULL) {
const WebPYUVABuffer* const buf = &output.u.YUVA;
*u = buf->u;
*v = buf->v;
*stride = buf->y_stride;
*uv_stride = buf->u_stride;
assert(buf->u_stride == buf->v_stride);
}
return out;
}
return out;
}
static void DefaultFeatures(WebPBitstreamFeatures* const features) {

5
src/webp/decode.h
View File

@ -81,10 +81,11 @@ WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
// returned is the Y samples buffer. Upon return, *u and *v will point to
// the U and V chroma data. These U and V buffers need NOT be passed to
// WebPFree(), unlike the returned Y luma one. The dimension of the U and V
// planes are both (*width + 1) / 2 and (*height + 1)/ 2.
// planes are both (*width + 1) / 2 and (*height + 1) / 2.
// Upon return, the Y buffer has a stride returned as '*stride', while U and V
// have a common stride returned as '*uv_stride'.
// Return NULL in case of error.
// 'width' and 'height' may be NULL, the other pointers must not be.
// Returns NULL in case of error.
// (*) Also named Y'CbCr. See: https://en.wikipedia.org/wiki/YCbCr
WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
int* width, int* height,