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saver/gif: memory usage optimization.

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Use a cache to store the intermediate palette data.
This commit is contained in:
Hermet Park 2023-11-17 11:47:32 +09:00 • committed by Hermet Park
parent 314c0a0351
commit 092da69003
2 changed files with 8 additions and 10 deletions
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17
src/savers/gif/tvgGifEncoder.cpp
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@ -302,26 +302,21 @@ static int _pickChangedPixels(const uint8_t* lastFrame, uint8_t* frame, int numP
// Creates a palette by placing all the image pixels in a k-d tree and then averaging the blocks at the bottom.
// This is known as the "modified median split" technique
static void _makePalette(const uint8_t* lastFrame, const uint8_t* nextFrame, uint32_t width, uint32_t height, int bitDepth, GifPalette* pPal, bool transparent)
static void _makePalette(GifWriter* writer, const uint8_t* lastFrame, const uint8_t* nextFrame, uint32_t width, uint32_t height, int bitDepth, GifPalette* pPal, bool transparent)
{
pPal->bitDepth = bitDepth;
// SplitPalette is destructive (it sorts the pixels by color) so
// we must create a copy of the image for it to destroy
size_t imageSize = (size_t)(width * height * 4 * sizeof(uint8_t));
uint8_t* destroyableImage = (uint8_t*)malloc(imageSize);
memcpy(destroyableImage, nextFrame, imageSize);
memcpy(writer->tmpImage, nextFrame, imageSize);
int numPixels = (int)(width * height);
if (lastFrame) numPixels = _pickChangedPixels(lastFrame, destroyableImage, numPixels, transparent);
if (lastFrame) numPixels = _pickChangedPixels(lastFrame, writer->tmpImage, numPixels, transparent);
const int lastElt = 1 << bitDepth;
const int splitElt = lastElt/2;
const int splitDist = splitElt/2;
_splitPalette(destroyableImage, numPixels, 1, lastElt, splitElt, splitDist, 1, pPal);
free(destroyableImage);
_splitPalette(writer->tmpImage, numPixels, 1, lastElt, splitElt, splitDist, 1, pPal);
// add the bottom node for the transparency index
pPal->treeSplit[1 << (bitDepth-1)] = 0;
@ -568,6 +563,7 @@ bool gifBegin(GifWriter* writer, const char* filename, uint32_t width, uint32_t
// allocate
writer->oldImage = (uint8_t*)malloc(width*height*4);
writer->tmpImage = (uint8_t*)malloc(width*height*4);
fputs("GIF89a", writer->f);
@ -618,7 +614,7 @@ bool gifWriteFrame(GifWriter* writer, const uint8_t* image, uint32_t width, uint
writer->firstFrame = false;
GifPalette pal;
_makePalette(oldImage, image, width, height, 8, &pal, transparent);
_makePalette(writer, oldImage, image, width, height, 8, &pal, transparent);
_thresholdImage(oldImage, image, writer->oldImage, width, height, &pal, transparent);
@ -635,6 +631,7 @@ bool gifEnd(GifWriter* writer)
fputc(0x3b, writer->f); // end of file
fclose(writer->f);
free(writer->oldImage);
free(writer->tmpImage);
writer->f = NULL;
writer->oldImage = NULL;

1
src/savers/gif/tvgGifEncoder.h
View file

@ -31,6 +31,7 @@ typedef struct
{
FILE* f;
uint8_t* oldImage;
uint8_t* tmpImage;
bool firstFrame;
} GifWriter;