ImageGlyph::ImageGlyph(const ImageRGBA& rgba, AlloyContext* context,
bool mipmap) :
Glyph("image_rgba", GlyphType::Image, 0, 0) {
handle = nvgCreateImageRGBA(context->nvgContext, rgba.width, rgba.height,
(mipmap) ? NVG_IMAGE_GENERATE_MIPMAPS : 0, rgba.ptr());
width = (pixel) rgba.width;
height = (pixel) rgba.height;
}
void
mergeAlpha(ImageRGBA& im, GnashImage::const_iterator alphaData,
const size_t bufferLength)
{
assert(bufferLength * 4 <= im.size());
// Point to the first alpha byte
GnashImage::iterator p = im.begin();
// Premultiplication is also done at rendering time (at least by the
// agg renderer).
// TODO: use BitmapData.loadBitmap to check whether it's also done here.
for (size_t i = 0; i < bufferLength; ++i, ++alphaData) {
*p = std::min(*p, *alphaData);
++p;
*p = std::min(*p, *alphaData);
++p;
*p = std::min(*p, *alphaData);
++p;
*p = *alphaData;
++p;
}
}
void ImageGlyph::set(const ImageRGBA& rgba, AlloyContext* context) {
nvgUpdateImage(context->nvgContext, handle, rgba.ptr());
}
void Application::getScreenShot(ImageRGBA& img) {
int w = 0, h = 0;
glfwGetFramebufferSize(context->window, &w, &h);
img.resize(w, h);
glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, img.ptr());
}
