godot/drivers/png/resource_saver_png.cpp

/**************************************************************************/
/*  resource_saver_png.cpp                                                */
/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "resource_saver_png.h"

#include "core/io/file_access.h"
#include "core/io/image.h"
#include "drivers/png/png_driver_common.h"
#include "scene/resources/texture.h"

Error ResourceSaverPNG::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 PNG.");
	ERR_FAIL_COND_V_MSG(!texture->get_width(), ERR_INVALID_PARAMETER, "Can't save empty texture as PNG.");

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

	Error err = save_image(p_path, img);

	return err;
}

Error ResourceSaverPNG::save_image(const String &p_path, const Ref<Image> &p_img) {
	Vector<uint8_t> buffer;
	Error err = PNGDriverCommon::image_to_png(p_img, buffer);
	ERR_FAIL_COND_V_MSG(err, err, "Can't convert image to PNG.");
	Ref<FileAccess> file = FileAccess::open(p_path, FileAccess::WRITE, &err);
	ERR_FAIL_COND_V_MSG(err, err, vformat("Can't save PNG 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> ResourceSaverPNG::save_image_to_buffer(const Ref<Image> &p_img) {
	Vector<uint8_t> buffer;
	Error err = PNGDriverCommon::image_to_png(p_img, buffer);
	ERR_FAIL_COND_V_MSG(err, Vector<uint8_t>(), "Can't convert image to PNG.");
	return buffer;
}

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

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

ResourceSaverPNG::ResourceSaverPNG() {
	Image::save_png_func = &save_image;
	Image::save_png_buffer_func = &save_image_to_buffer;
}