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lottie2gif: support set background color as an extra argument.

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If lottie contents were designed in white color, gif result is invisible.

we can generate gif with a specified bg color.

lottie2gif [lottieFileName]
lottie2gif [lottieFileName] [bgColor]

example:

lottie2gif sample.json         //white bg color in default.
lottie2gif sample.json ff0000  //red bg color
This commit is contained in:
Hermet Park 2019-05-29 17:40:59 +09:00
parent 991d231f2d
commit 682bf0c560
1 changed files with 18 additions and 13 deletions
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31
example/lottie2gif.cpp
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@ -9,9 +9,12 @@
class GifBuilder { class GifBuilder {
public: public:
explicit GifBuilder(const std::string &fileName , const uint32_t width, explicit GifBuilder(const std::string &fileName , const uint32_t width,
const uint32_t height, const uint32_t delay = 2) const uint32_t height, const int bgColor=0xffffffff, const uint32_t delay = 2)
{ {
GifBegin(&handle, fileName.c_str(), width, height, delay); GifBegin(&handle, fileName.c_str(), width, height, delay);
bgColorR = (uint8_t) ((bgColor & 0xff0000) >> 16);
bgColorG = (uint8_t) ((bgColor & 0x00ff00) >> 8);
bgColorB = (uint8_t) ((bgColor & 0x0000ff));
} }
~GifBuilder() ~GifBuilder()
{ {
@ -40,13 +43,12 @@ public:
unsigned char b = buffer[i]; unsigned char b = buffer[i];
if (a != 255) { //un premultiply if (a != 255) { //un premultiply
r = (r * 255) / a; unsigned char r2 = (unsigned char) ((float) bgColorR * ((float) (255 - a) / 255));
g = (g * 255) / a; unsigned char g2 = (unsigned char) ((float) bgColorG * ((float) (255 - a) / 255));
b = (b * 255) / a; unsigned char b2 = (unsigned char) ((float) bgColorB * ((float) (255 - a) / 255));
buffer[i] = r + r2;
buffer[i] = r; buffer[i+1] = g + g2;
buffer[i+1] = g; buffer[i+2] = b + b2;
buffer[i+2] = b;
} else { } else {
// only swizzle r and b // only swizzle r and b
@ -54,15 +56,16 @@ public:
buffer[i+2] = b; buffer[i+2] = b;
} }
} else { } else {
buffer[i+2] = 255; buffer[i+2] = bgColorB;
buffer[i+1] = 255; buffer[i+1] = bgColorG;
buffer[i] = 255; buffer[i] = bgColorR;
} }
} }
} }
private: private:
GifWriter handle; GifWriter handle;
uint8_t bgColorR, bgColorG, bgColorB;
}; };
class App { class App {
@ -75,7 +78,7 @@ public:
auto buffer = std::unique_ptr<uint32_t[]>(new uint32_t[w * h]); auto buffer = std::unique_ptr<uint32_t[]>(new uint32_t[w * h]);
size_t frameCount = player->totalFrame(); size_t frameCount = player->totalFrame();
GifBuilder builder(baseName.data(), w, h); GifBuilder builder(baseName.data(), w, h, bgColor);
for (size_t i = 0; i < frameCount ; i++) { for (size_t i = 0; i < frameCount ; i++) {
rlottie::Surface surface(buffer.get(), w, h, w * 4); rlottie::Surface surface(buffer.get(), w, h, w * 4);
player->renderSync(i, surface); player->renderSync(i, surface);
@ -87,6 +90,7 @@ public:
int setup(int argc, char **argv) int setup(int argc, char **argv)
{ {
if (argc > 1) fileName = argv[1]; if (argc > 1) fileName = argv[1];
if (argc > 2) bgColor = strtol(argv[2], NULL, 16);
if (!fileName) return help(); if (!fileName) return help();
@ -114,12 +118,13 @@ private:
} }
int help() { int help() {
std::cout<<"Usage: \n lottie2gif [lottieFileName]\n"; std::cout<<"Usage: \n lottie2gif [lottieFileName] [bgColor]\n\nExamples: \n $ lottie2gif input.json\n $ lottie2gif input.json ff00ff\n\n";
return 1; return 1;
} }
private: private:
char *fileName{nullptr}; char *fileName{nullptr};
int bgColor = 0xffffffff;
std::array<char, 5000> absoloutePath; std::array<char, 5000> absoloutePath;
std::array<char, 5000> baseName; std::array<char, 5000> baseName;
}; };