git_clone/thorvg
1
0
Fork 0
mirror of https://github.com/thorvg/thorvg.git synced 2025-06-14 20:14:37 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 5

gif/encoder: adjusted alpha transparent threshold 255 -> 127

Browse source 
More than half-transparent(50%) pixels will be encoded as well.
This commit is contained in:
Hermet Park 2023-11-17 12:33:45 +09:00
parent 89a6a835dd
commit c44e09faae
1 changed files with 3 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/savers/gif/tvgGifEncoder.cpp
View file

@ -51,6 +51,7 @@
#define TRANSPARENT_IDX 0 #define TRANSPARENT_IDX 0
#define TRANSPARENT_THRESHOLD 127
typedef struct typedef struct
{ {
@ -283,7 +284,7 @@ static int _pickChangedPixels(const uint8_t* lastFrame, uint8_t* frame, int numP
uint8_t* writeIter = frame; uint8_t* writeIter = frame;
for (int ii=0; ii < numPixels; ++ii) { for (int ii=0; ii < numPixels; ++ii) {
if (frame[3] == 255) { if (frame[3] >= TRANSPARENT_THRESHOLD) {
if (transparent || (lastFrame[0] != frame[0] || lastFrame[1] != frame[1] || lastFrame[2] != frame[2])) { if (transparent || (lastFrame[0] != frame[0] || lastFrame[1] != frame[1] || lastFrame[2] != frame[2])) {
writeIter[0] = frame[0]; writeIter[0] = frame[0];
writeIter[1] = frame[1]; writeIter[1] = frame[1];
@ -347,7 +348,7 @@ static void _thresholdImage(const uint8_t* lastFrame, const uint8_t* nextFrame,
if (transparent) { if (transparent) {
for (uint32_t ii = 0; ii < numPixels; ++ii) { for (uint32_t ii = 0; ii < numPixels; ++ii) {
if (nextFrame[3] < 255) { if (nextFrame[3] < TRANSPARENT_THRESHOLD) {
outFrame[0] = 0; outFrame[0] = 0;
outFrame[1] = 0; outFrame[1] = 0;
outFrame[2] = 0; outFrame[2] = 0;