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webpmux: warn when odd frame offsets are used

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offsets are stored as (x/2, y/2)

Change-Id: Ic8f727ab7996a84c1f8c57f4f6dbaf8701bf8eae
This commit is contained in:
James Zern 2014-06-17 23:21:49 -07:00
parent 6e93317f5b
commit c072663493
1 changed files with 15 additions and 1 deletions
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16
examples/webpmux.c
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@ -371,6 +371,14 @@ static void PrintHelp(void) {
printf(" and is assumed to be\nvalid.\n"); printf(" and is assumed to be\nvalid.\n");
} }
static void WarnAboutOddOffset(const WebPMuxFrameInfo* const info) {
if ((info->x_offset | info->y_offset) & 1) {
fprintf(stderr, "Warning: odd offsets will be snapped to even values"
" (%d, %d) -> (%d, %d)\n", info->x_offset, info->y_offset,
info->x_offset & ~1, info->y_offset & ~1);
}
}
static int ReadFileToWebPData(const char* const filename, static int ReadFileToWebPData(const char* const filename,
WebPData* const webp_data) { WebPData* const webp_data) {
const uint8_t* data; const uint8_t* data;
@ -444,6 +452,9 @@ static int ParseFrameArgs(const char* args, WebPMuxFrameInfo* const info) {
default: default:
return 0; return 0;
} }
WarnAboutOddOffset(info);
// Note: The sanity of the following conversion is checked by // Note: The sanity of the following conversion is checked by
// WebPMuxPushFrame(). // WebPMuxPushFrame().
info->dispose_method = (WebPMuxAnimDispose)dispose_method; info->dispose_method = (WebPMuxAnimDispose)dispose_method;
@ -456,7 +467,10 @@ static int ParseFrameArgs(const char* args, WebPMuxFrameInfo* const info) {
} }
static int ParseFragmentArgs(const char* args, WebPMuxFrameInfo* const info) { static int ParseFragmentArgs(const char* args, WebPMuxFrameInfo* const info) {
return (sscanf(args, "+%d+%d", &info->x_offset, &info->y_offset) == 2); const int ok =
(sscanf(args, "+%d+%d", &info->x_offset, &info->y_offset) == 2);
if (ok) WarnAboutOddOffset(info);
return ok;
} }
static int ParseBgcolorArgs(const char* args, uint32_t* const bgcolor) { static int ParseBgcolorArgs(const char* args, uint32_t* const bgcolor) {