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Mux API change:

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Create common APIs for image, frame and tile.

Change-Id: I709ad752133094bd5bc89dd9c832ff79802aac68
This commit is contained in:
Urvang Joshi
2012-08-23 16:28:36 +05:30
parent c6e98658d2
commit d0c79f0552
7 changed files with 286 additions and 443 deletions
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43
src/mux/muxinternal.c
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@ -109,7 +109,7 @@ WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag) {
// Outputs a pointer to 'prev_chunk->next_',
// where 'prev_chunk' is the pointer to the chunk at position (nth - 1).
// Returns 1 if nth chunk was found, 0 otherwise.
// Returns true if nth chunk was found.
static int ChunkSearchListToSet(WebPChunk** chunk_list, uint32_t nth,
WebPChunk*** const location) {
uint32_t count = 0;
@ -275,10 +275,14 @@ int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) {
int count = 0;
const WebPMuxImage* current;
for (current = wpi_list; current != NULL; current = current->next_) {
const WebPChunk* const wpi_chunk = *MuxImageGetListFromId(current, id);
if (wpi_chunk != NULL) {
const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
if (wpi_chunk_id == id) ++count;
if (id == WEBP_CHUNK_NIL) {
++count; // Special case: count all images.
} else {
const WebPChunk* const wpi_chunk = *MuxImageGetListFromId(current, id);
if (wpi_chunk != NULL) {
const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
if (wpi_chunk_id == id) ++count; // Count images with a matching 'id'.
}
}
}
return count;
@ -286,34 +290,22 @@ int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) {
// Outputs a pointer to 'prev_wpi->next_',
// where 'prev_wpi' is the pointer to the image at position (nth - 1).
// Returns 1 if nth image with given id was found, 0 otherwise.
// Returns true if nth image was found.
static int SearchImageToGetOrDelete(WebPMuxImage** wpi_list, uint32_t nth,
WebPChunkId id,
WebPMuxImage*** const location) {
uint32_t count = 0;
assert(wpi_list);
*location = wpi_list;
// Search makes sense only for the following.
assert(id == WEBP_CHUNK_FRAME || id == WEBP_CHUNK_TILE ||
id == WEBP_CHUNK_IMAGE);
assert(id != WEBP_CHUNK_IMAGE || nth == 1);
if (nth == 0) {
nth = MuxImageCount(*wpi_list, id);
nth = MuxImageCount(*wpi_list, WEBP_CHUNK_NIL);
if (nth == 0) return 0; // Not found.
}
while (*wpi_list) {
WebPMuxImage* const cur_wpi = *wpi_list;
const WebPChunk* const wpi_chunk = *MuxImageGetListFromId(cur_wpi, id);
if (wpi_chunk != NULL) {
const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
if (wpi_chunk_id == id) {
++count;
if (count == nth) return 1; // Found.
}
}
++count;
if (count == nth) return 1; // Found.
wpi_list = &cur_wpi->next_;
*location = wpi_list;
}
@ -361,10 +353,9 @@ void MuxImageDeleteAll(WebPMuxImage** const wpi_list) {
}
}
WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
WebPChunkId id) {
WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth) {
assert(wpi_list);
if (!SearchImageToGetOrDelete(wpi_list, nth, id, &wpi_list)) {
if (!SearchImageToGetOrDelete(wpi_list, nth, &wpi_list)) {
return WEBP_MUX_NOT_FOUND;
}
*wpi_list = MuxImageDelete(*wpi_list);
@ -375,10 +366,10 @@ WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
// MuxImage reader methods.
WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth,
WebPChunkId id, WebPMuxImage** wpi) {
WebPMuxImage** wpi) {
assert(wpi_list);
assert(wpi);
if (!SearchImageToGetOrDelete((WebPMuxImage**)wpi_list, nth, id,
if (!SearchImageToGetOrDelete((WebPMuxImage**)wpi_list, nth,
(WebPMuxImage***)&wpi_list)) {
return WEBP_MUX_NOT_FOUND;
}