// Get the canvas width, height and flags after validating that VP8X/VP8/VP8L
// chunk and canvas size are valid.
static WebPMuxError MuxGetCanvasInfo(const WebPMux* const mux,
int* width, int* height, uint32_t* flags) {
int w, h;
uint32_t f = 0;
WebPData data;
assert(mux != NULL);
// Check if VP8X chunk is present.
if (MuxGet(mux, IDX_VP8X, 1, &data) == WEBP_MUX_OK) {
if (data.size < VP8X_CHUNK_SIZE) return WEBP_MUX_BAD_DATA;
f = GetLE32(data.bytes + 0);
w = GetLE24(data.bytes + 4) + 1;
h = GetLE24(data.bytes + 7) + 1;
} else {
const WebPMuxImage* const wpi = mux->images_;
// Grab user-forced canvas size as default.
w = mux->canvas_width_;
h = mux->canvas_height_;
if (w == 0 && h == 0 && ValidateForSingleImage(mux) == WEBP_MUX_OK) {
// single image and not forced canvas size => use dimension of first frame
assert(wpi != NULL);
w = wpi->width_;
h = wpi->height_;
}
if (wpi != NULL) {
if (wpi->has_alpha_) f |= ALPHA_FLAG;
}
}
if (w * (uint64_t)h >= MAX_IMAGE_AREA) return WEBP_MUX_BAD_DATA;
if (width != NULL) *width = w;
if (height != NULL) *height = h;
if (flags != NULL) *flags = f;
return WEBP_MUX_OK;
}
// Get the canvas width, height and flags after validating that VP8X/VP8/VP8L
// chunk and canvas size are valid.
static WebPMuxError MuxGetCanvasInfo(const WebPMux* const mux,
int* width, int* height, uint32_t* flags) {
int w, h;
uint32_t f = 0;
WebPData data;
assert(mux != NULL);
// Check if VP8X chunk is present.
if (MuxGet(mux, IDX_VP8X, 1, &data) == WEBP_MUX_OK) {
if (data.size < VP8X_CHUNK_SIZE) return WEBP_MUX_BAD_DATA;
f = GetLE32(data.bytes + 0);
w = GetLE24(data.bytes + 4) + 1;
h = GetLE24(data.bytes + 7) + 1;
} else { // Single image case.
const WebPMuxImage* const wpi = mux->images_;
WebPMuxError err = ValidateForSingleImage(mux);
if (err != WEBP_MUX_OK) return err;
assert(wpi != NULL);
w = wpi->width_;
h = wpi->height_;
if (wpi->has_alpha_) f |= ALPHA_FLAG;
}
if (w * (uint64_t)h >= MAX_IMAGE_AREA) return WEBP_MUX_BAD_DATA;
if (width != NULL) *width = w;
if (height != NULL) *height = h;
if (flags != NULL) *flags = f;
return WEBP_MUX_OK;
}
