godot/modules/webp/resource_saver_webp.cpp

/*************************************************************************/
/*  resource_saver_webp.cpp                                              */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#include "resource_saver_webp.h"

#include "core/io/file_access.h"
#include "core/io/image.h"
#include "scene/resources/texture.h"
#include "webp_common.h"

Error ResourceSaverWebP::save(const Ref<Resource> &p_resource, const String &p_path, uint32_t p_flags) {
	Ref<ImageTexture> texture = p_resource;

	ERR_FAIL_COND_V_MSG(!texture.is_valid(), ERR_INVALID_PARAMETER, "Can't save invalid texture as WebP.");
	ERR_FAIL_COND_V_MSG(!texture->get_width(), ERR_INVALID_PARAMETER, "Can't save empty texture as WebP.");

	Ref<Image> img = texture->get_image();

	Error err = save_image(p_path, img);

	return err;
}

Error ResourceSaverWebP::save_image(const String &p_path, const Ref<Image> &p_img, const bool p_lossy, const float p_quality) {
	Vector<uint8_t> buffer = save_image_to_buffer(p_img, p_lossy, p_quality);
	Error err;
	Ref<FileAccess> file = FileAccess::open(p_path, FileAccess::WRITE, &err);
	ERR_FAIL_COND_V_MSG(err, err, vformat("Can't save WebP at path: '%s'.", p_path));

	const uint8_t *reader = buffer.ptr();

	file->store_buffer(reader, buffer.size());
	if (file->get_error() != OK && file->get_error() != ERR_FILE_EOF) {
		return ERR_CANT_CREATE;
	}

	return OK;
}

Vector<uint8_t> ResourceSaverWebP::save_image_to_buffer(const Ref<Image> &p_img, const bool p_lossy, const float p_quality) {
	Vector<uint8_t> buffer;
	if (p_lossy) {
		buffer = WebPCommon::_webp_lossy_pack(p_img, p_quality);
	} else {
		buffer = WebPCommon::_webp_lossless_pack(p_img);
	}
	return buffer;
}

bool ResourceSaverWebP::recognize(const Ref<Resource> &p_resource) const {
	return (p_resource.is_valid() && p_resource->is_class("ImageTexture"));
}

void ResourceSaverWebP::get_recognized_extensions(const Ref<Resource> &p_resource, List<String> *p_extensions) const {
	if (Object::cast_to<ImageTexture>(*p_resource)) {
		p_extensions->push_back("webp");
	}
}

ResourceSaverWebP::ResourceSaverWebP() {
	Image::save_webp_func = &save_image;
	Image::save_webp_buffer_func = &save_image_to_buffer;
}