140 lines
4.0 KiB
C++
140 lines
4.0 KiB
C++
/* The MIT License
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*
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* Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "textureloader.h"
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#include "texture.h"
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#include <png.h>
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struct File
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{
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File() {
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offset = 0;
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}
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uchar *data;
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uint offset;
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};
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void png_read_from_mem(png_structp png_ptr, png_bytep data, png_size_t size)
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{
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File *file = (File*)png_get_io_ptr(png_ptr);
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/* Copy data from image buffer */
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memcpy(data, file->data + file->offset, size);
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/* Advance in the file */
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file->offset += size;
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}
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Texture *TextureLoader::loadPNG(uchar *fileData)
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{
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File file;
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file.data = fileData;
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if(png_sig_cmp(file.data, 0, 8))
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return NULL;
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png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if(!png_ptr)
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return NULL;
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if(!info_ptr) {
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png_destroy_read_struct(&png_ptr, NULL, NULL);
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return NULL;
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}
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if(setjmp(png_jmpbuf(png_ptr))) {
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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return NULL;
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}
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// Set "png_read" callback function and give source of data
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png_set_read_fn(png_ptr, (png_voidp *)&file, png_read_from_mem);
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png_read_info(png_ptr, info_ptr);
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int bitDepth = png_get_bit_depth(png_ptr, info_ptr);
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int colourType = png_get_color_type(png_ptr, info_ptr);
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if(colourType == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(png_ptr);
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if(bitDepth < 8 && (colourType == PNG_COLOR_TYPE_GRAY || colourType == PNG_COLOR_TYPE_GRAY_ALPHA))
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png_set_expand_gray_1_2_4_to_8(png_ptr);
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if(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(png_ptr);
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if(bitDepth < 8)
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png_set_packing(png_ptr);
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else if(bitDepth == 16)
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png_set_strip_16(png_ptr);
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png_read_update_info(png_ptr, info_ptr);
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png_uint_32 width, height;
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png_get_IHDR(png_ptr, info_ptr, &width, &height, &bitDepth, &colourType, NULL, NULL, NULL);
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int components;
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switch(colourType)
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{
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case PNG_COLOR_TYPE_GRAY:
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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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components = 2;
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break;
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case PNG_COLOR_TYPE_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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components = 4;
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break;
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default:
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if(png_ptr)
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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return NULL;
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};
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uchar *pixels = new uchar[width * height * components];
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png_bytep *row_pointers = new png_bytep[height];
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for(uint i = 0; i < height; ++i)
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row_pointers[i] = (png_bytep)(pixels + (i * width * components));
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png_read_image(png_ptr, row_pointers);
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png_read_end(png_ptr, NULL);
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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delete[] row_pointers;
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Texture *texture = new Texture(width, height, components, pixels);
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delete[] pixels;
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return texture;
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}
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