+ // On desktop OpenGL, there's also GL_SLUMINANCE8 which could give us
+ // support for single-channel sRGB decoding, but it's not supported
+ // on GLES, and we're already actively rewriting single-channel inputs
+ // to GL_RED (even on desktop), so we stick to 3- and 4-channel inputs.
+ return (movit_srgb_textures_supported &&
+ type == GL_UNSIGNED_BYTE &&
+ (pixel_format == FORMAT_RGB ||
+ pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) &&
+ (image_format.gamma_curve == GAMMA_LINEAR ||
+ image_format.gamma_curve == GAMMA_sRGB));
+ }
+ virtual AlphaHandling alpha_handling() const {
+ switch (pixel_format) {
+ case FORMAT_RGBA_PREMULTIPLIED_ALPHA:
+ return INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA;
+ case FORMAT_RGBA_POSTMULTIPLIED_ALPHA:
+ return OUTPUT_POSTMULTIPLIED_ALPHA;
+ case FORMAT_R:
+ case FORMAT_RG:
+ case FORMAT_RGB:
+ return OUTPUT_BLANK_ALPHA;
+ default:
+ assert(false);
+ }