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| void IrregularButton::loadNormalTransparentInfo()
{
#ifdef DEBUG
auto start = std::chrono::steady_clock::now();
#endif
Sprite* normalRenderer = static_cast<Sprite*>(_buttonNormalRenderer);
auto normalTexture = normalRenderer->getTexture();
const Size& s = normalTexture->getContentSizeInPixels();
int savedBufferWidth = (int)s.width;
int savedBufferHeight = (int)s.height;
GLubyte *buffer = nullptr;
// the FBO which cocos2dx used is not window-system-provided (non-zero id)
GLint oldFBO;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &oldFBO);
GLuint framebuffer;
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
glBindTexture(GL_TEXTURE_2D, normalTexture->getName());
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA4, savedBufferWidth, savedBufferHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, normalTexture->getName(), 0);
CCASSERT(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, "Could not attach texture to framebuffer");
buffer = new (std::nothrow) GLubyte[savedBufferWidth * savedBufferHeight * 4];
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, savedBufferWidth, savedBufferHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
glBindFramebuffer(GL_FRAMEBUFFER, oldFBO);
auto dataLen = savedBufferWidth * savedBufferHeight * 4;
if (normalTransparent_ != nullptr) {
delete[] normalTransparent_;
}
normalImageWidth_ = savedBufferWidth;
normalImageHeight_ = savedBufferHeight;
normalTransparent_ = new bool[dataLen / (sizeof(unsigned char) * 4)];
for (auto i = 0; i < normalImageHeight_; i++) {
for (auto j = 0; j < normalImageWidth_; j++) {
normalTransparent_[i * normalImageWidth_ + j] = (buffer[(i * normalImageWidth_ + j) * 4 + 3] == 0);
}
}
CC_SAFE_DELETE_ARRAY(buffer);
#ifdef DEBUG
auto end = std::chrono::steady_clock::now();
auto totalTime = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
printf("load from memory: %lld ms\n", totalTime.count());
#endif
}
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