/**************************************************************************/
/*  image_frames_loader_png.cpp                                           */
/**************************************************************************/
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#include "image_frames_loader_png.h"

#include "drivers/png/png_driver_common.h"

Error ImageFramesLoaderPNG::load_image_frames(Ref<ImageFrames> p_image, Ref<FileAccess> f, BitField<ImageFramesFormatLoader::LoaderFlags> p_flags, float p_scale, int p_max_frames) {
	const uint64_t buffer_size = f->get_length();
	Vector<uint8_t> file_buffer;
	Error err = file_buffer.resize(buffer_size);
	if (err) {
		return err;
	}
	{
		uint8_t *writer = file_buffer.ptrw();
		f->get_buffer(writer, buffer_size);
	}
	const uint8_t *reader = file_buffer.ptr();
	return PNGDriverCommon::apng_to_image_frames(reader, buffer_size, p_flags & FLAG_FORCE_LINEAR, p_max_frames, p_image);
}

void ImageFramesLoaderPNG::get_recognized_extensions(List<String> *p_extensions) const {
	p_extensions->push_back("png");
	p_extensions->push_back("apng");
}

Ref<ImageFrames> ImageFramesLoaderPNG::load_mem_apng(const uint8_t *p_png, int p_size, int p_max_frames) {
	Ref<ImageFrames> img_frames;
	img_frames.instantiate();

	// the value of p_force_linear does not matter since it only applies to 16 bit
	Error err = PNGDriverCommon::apng_to_image_frames(p_png, p_size, false, p_max_frames, img_frames);
	ERR_FAIL_COND_V(err, Ref<ImageFrames>());

	return img_frames;
}

ImageFramesLoaderPNG::ImageFramesLoaderPNG() {
	ImageFrames::_apng_mem_loader_func = load_mem_apng;
}