431 lines
11 KiB
C++
431 lines
11 KiB
C++
/*************************************************************************/
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/* image_loader_png.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "image_loader_png.h"
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#include "os/os.h"
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#include "print_string.h"
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#include <string.h>
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void ImageLoaderPNG::_read_png_data(png_structp png_ptr, png_bytep data, png_size_t p_length) {
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FileAccess *f = (FileAccess *)png_get_io_ptr(png_ptr);
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f->get_buffer((uint8_t *)data, p_length);
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}
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/*
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png_structp png_ptr = png_create_read_struct_2
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(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
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user_error_fn, user_warning_fn, (png_voidp)
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user_mem_ptr, user_malloc_fn, user_free_fn);
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*/
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static png_voidp _png_malloc_fn(png_structp png_ptr, png_size_t size) {
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return memalloc(size);
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}
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static void _png_free_fn(png_structp png_ptr, png_voidp ptr) {
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memfree(ptr);
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}
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static void _png_error_function(png_structp, png_const_charp text) {
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ERR_PRINT(text);
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}
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static void _png_warn_function(png_structp, png_const_charp text) {
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WARN_PRINT(text);
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}
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typedef void(PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
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Error ImageLoaderPNG::_load_image(void *rf_up, png_rw_ptr p_func, Image *p_image) {
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png_structp png;
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png_infop info;
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//png = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, NULL, NULL);
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png = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, _png_error_function, _png_warn_function, (png_voidp)NULL,
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_png_malloc_fn, _png_free_fn);
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ERR_FAIL_COND_V(!png, ERR_OUT_OF_MEMORY);
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info = png_create_info_struct(png);
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if (!info) {
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png_destroy_read_struct(&png, NULL, NULL);
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ERR_PRINT("Out of Memory");
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return ERR_OUT_OF_MEMORY;
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}
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if (setjmp(png_jmpbuf(png))) {
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png_destroy_read_struct(&png, NULL, NULL);
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ERR_PRINT("PNG Corrupted");
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return ERR_FILE_CORRUPT;
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}
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png_set_read_fn(png, (void *)rf_up, p_func);
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png_uint_32 width, height;
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int depth, color;
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png_read_info(png, info);
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png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
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//https://svn.gov.pt/projects/ccidadao/repository/middleware-offline/trunk/_src/eidmw/FreeImagePTEiD/Source/FreeImage/PluginPNG.cpp
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//png_get_text(png,info,)
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/*
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printf("Image width:%i\n", width);
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printf("Image Height:%i\n", height);
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printf("Bit depth:%i\n", depth);
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printf("Color type:%i\n", color);
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*/
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if (depth < 8) { //only bit dept 8 per channel is handled
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png_set_packing(png);
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};
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if (depth > 8) {
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png_set_strip_16(png);
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png_read_update_info(png, info);
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}
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if (png_get_valid(png, info, PNG_INFO_tRNS)) {
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// png_set_expand_gray_1_2_4_to_8(png);
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png_set_tRNS_to_alpha(png);
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png_read_update_info(png, info);
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png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
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}
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int palette_colors = 0;
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int palette_components = 0;
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int components = 0;
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Image::Format fmt;
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switch (color) {
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case PNG_COLOR_TYPE_GRAY: {
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fmt = Image::FORMAT_GRAYSCALE;
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components = 1;
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} break;
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case PNG_COLOR_TYPE_GRAY_ALPHA: {
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fmt = Image::FORMAT_GRAYSCALE_ALPHA;
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components = 2;
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} break;
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case PNG_COLOR_TYPE_RGB: {
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fmt = Image::FORMAT_RGB;
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components = 3;
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} break;
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case PNG_COLOR_TYPE_RGB_ALPHA: {
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fmt = Image::FORMAT_RGBA;
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components = 4;
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} break;
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case PNG_COLOR_TYPE_PALETTE: {
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int ntrans = 0;
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png_get_tRNS(png, info, NULL, &ntrans, NULL);
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//printf("transparent colors %i\n", ntrans);
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fmt = ntrans > 0 ? Image::FORMAT_INDEXED_ALPHA : Image::FORMAT_INDEXED;
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palette_components = ntrans > 0 ? 4 : 3;
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components = 1;
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png_colorp colors;
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png_get_PLTE(png, info, &colors, &palette_colors);
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} break;
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default: {
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ERR_PRINT("INVALID PNG TYPE");
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png_destroy_read_struct(&png, &info, NULL);
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return ERR_UNAVAILABLE;
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} break;
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}
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//int rowsize = png_get_rowbytes(png, info);
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int rowsize = components * width;
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DVector<uint8_t> dstbuff;
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dstbuff.resize(rowsize * height + palette_components * 256); // alloc the entire palette? - yes always
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DVector<uint8_t>::Write dstbuff_write = dstbuff.write();
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uint8_t *data = dstbuff_write.ptr();
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uint8_t **row_p = memnew_arr(uint8_t *, height);
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for (unsigned int i = 0; i < height; i++) {
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row_p[i] = &data[components * width * i];
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}
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png_read_image(png, (png_bytep *)row_p);
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if (palette_colors) {
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uint8_t *r_pal = &data[components * width * height]; // end of the array
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png_colorp colors;
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int num;
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png_get_PLTE(png, info, &colors, &num);
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int ofs = 0;
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for (int i = 0; i < palette_colors; i++) {
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r_pal[ofs + 0] = colors[i].red;
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r_pal[ofs + 1] = colors[i].green;
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r_pal[ofs + 2] = colors[i].blue;
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if (palette_components == 4) {
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r_pal[ofs + 3] = 255;
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};
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ofs += palette_components;
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};
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if (fmt == Image::FORMAT_INDEXED_ALPHA) {
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png_color_16p alphas;
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png_bytep alpha_idx;
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int count;
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png_get_tRNS(png, info, &alpha_idx, &count, &alphas);
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for (int i = 0; i < count; i++) {
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//printf("%i: loading alpha fron transparent color %i, values %i, %i, %i, %i, %i\n", i, (int)alpha_idx[i], (int)alphas[i].index, (int)alphas[i].red, (int)alphas[i].green, (int)alphas[i].blue, (int)alphas[i].gray);
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//r_pal[alpha_idx[i]] = alphas[i].gray >> 8;
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r_pal[i * 4 + 3] = alpha_idx[i];
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};
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};
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};
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memdelete_arr(row_p);
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p_image->create(width, height, 0, fmt, dstbuff);
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png_destroy_read_struct(&png, &info, NULL);
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return OK;
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}
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Error ImageLoaderPNG::load_image(Image *p_image, FileAccess *f) {
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Error err = _load_image(f, _read_png_data, p_image);
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f->close();
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return err;
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}
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void ImageLoaderPNG::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("png");
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}
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struct PNGReadStatus {
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int offset;
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int size;
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const unsigned char *image;
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};
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static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t p_length) {
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PNGReadStatus *rstatus;
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rstatus = (PNGReadStatus *)png_get_io_ptr(png_ptr);
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int to_read = p_length;
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if (rstatus->size >= 0) {
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to_read = MIN(p_length, rstatus->size - rstatus->offset);
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}
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memcpy(data, &rstatus->image[rstatus->offset], to_read);
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rstatus->offset += to_read;
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if (to_read < p_length) {
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memset(&data[to_read], 0, p_length - to_read);
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}
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}
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static Image _load_mem_png(const uint8_t *p_png, int p_size) {
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PNGReadStatus prs;
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prs.image = p_png;
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prs.offset = 0;
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prs.size = p_size;
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Image img;
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Error err = ImageLoaderPNG::_load_image(&prs, user_read_data, &img);
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ERR_FAIL_COND_V(err, Image());
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return img;
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}
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static Image _lossless_unpack_png(const DVector<uint8_t> &p_data) {
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int len = p_data.size();
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DVector<uint8_t>::Read r = p_data.read();
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ERR_FAIL_COND_V(r[0] != 'P' || r[1] != 'N' || r[2] != 'G' || r[3] != ' ', Image());
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return _load_mem_png(&r[4], len - 4);
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}
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static void _write_png_data(png_structp png_ptr, png_bytep data, png_size_t p_length) {
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DVector<uint8_t> &v = *(DVector<uint8_t> *)png_get_io_ptr(png_ptr);
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int vs = v.size();
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v.resize(vs + p_length);
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DVector<uint8_t>::Write w = v.write();
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copymem(&w[vs], data, p_length);
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//print_line("png write: "+itos(p_length));
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}
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static DVector<uint8_t> _lossless_pack_png(const Image &p_image) {
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Image img = p_image;
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if (img.get_format() > Image::FORMAT_INDEXED_ALPHA)
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img.decompress();
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ERR_FAIL_COND_V(img.get_format() > Image::FORMAT_INDEXED_ALPHA, DVector<uint8_t>());
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png_structp png_ptr;
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png_infop info_ptr;
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png_bytep *row_pointers;
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/* initialize stuff */
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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ERR_FAIL_COND_V(!png_ptr, DVector<uint8_t>());
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info_ptr = png_create_info_struct(png_ptr);
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ERR_FAIL_COND_V(!info_ptr, DVector<uint8_t>());
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if (setjmp(png_jmpbuf(png_ptr))) {
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ERR_FAIL_V(DVector<uint8_t>());
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}
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DVector<uint8_t> ret;
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ret.push_back('P');
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ret.push_back('N');
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ret.push_back('G');
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ret.push_back(' ');
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png_set_write_fn(png_ptr, &ret, _write_png_data, NULL);
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/* write header */
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if (setjmp(png_jmpbuf(png_ptr))) {
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ERR_FAIL_V(DVector<uint8_t>());
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}
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int pngf = 0;
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int cs = 0;
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switch (img.get_format()) {
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case Image::FORMAT_GRAYSCALE: {
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pngf = PNG_COLOR_TYPE_GRAY;
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cs = 1;
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} break;
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case Image::FORMAT_GRAYSCALE_ALPHA: {
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pngf = PNG_COLOR_TYPE_GRAY_ALPHA;
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cs = 2;
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} break;
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case Image::FORMAT_RGB: {
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pngf = PNG_COLOR_TYPE_RGB;
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cs = 3;
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} break;
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case Image::FORMAT_RGBA: {
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pngf = PNG_COLOR_TYPE_RGB_ALPHA;
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cs = 4;
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} break;
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default: {
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if (img.detect_alpha()) {
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img.convert(Image::FORMAT_RGBA);
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pngf = PNG_COLOR_TYPE_RGB_ALPHA;
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cs = 4;
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} else {
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img.convert(Image::FORMAT_RGB);
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pngf = PNG_COLOR_TYPE_RGB;
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cs = 3;
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}
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}
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}
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int w = img.get_width();
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int h = img.get_height();
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png_set_IHDR(png_ptr, info_ptr, w, h,
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8, pngf, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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png_write_info(png_ptr, info_ptr);
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/* write bytes */
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if (setjmp(png_jmpbuf(png_ptr))) {
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ERR_FAIL_V(DVector<uint8_t>());
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}
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DVector<uint8_t>::Read r = img.get_data().read();
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row_pointers = (png_bytep *)memalloc(sizeof(png_bytep) * h);
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for (int i = 0; i < h; i++) {
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row_pointers[i] = (png_bytep)&r[i * w * cs];
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}
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png_write_image(png_ptr, row_pointers);
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memfree(row_pointers);
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/* end write */
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if (setjmp(png_jmpbuf(png_ptr))) {
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ERR_FAIL_V(DVector<uint8_t>());
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}
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png_write_end(png_ptr, NULL);
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return ret;
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}
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ImageLoaderPNG::ImageLoaderPNG() {
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Image::_png_mem_loader_func = _load_mem_png;
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Image::lossless_unpacker = _lossless_unpack_png;
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Image::lossless_packer = _lossless_pack_png;
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}
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