2 Copyright (C) 1999-2006 Id Software, Inc. and contributors.
3 For a list of contributors, see the accompanying CONTRIBUTORS file.
5 This file is part of GtkRadiant.
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "debugging/debugging.h"
26 #include "ifilesystem.h"
31 // ====== PNG loader functionality ======
36 void user_warning_fn(png_structp png_ptr, png_const_charp warning_msg)
38 globalErrorStream() << "libpng warning: " << warning_msg << "\n";
41 void user_error_fn(png_structp png_ptr, png_const_charp error_msg)
43 globalErrorStream() << "libpng error: " << error_msg << "\n";
44 longjmp(png_jmpbuf(png_ptr), 0);
47 void user_read_data(png_structp png_ptr, png_bytep data, png_uint_32 length)
49 png_bytep *p_p_fbuffer = (png_bytep*)png_get_io_ptr(png_ptr);
50 memcpy(data, *p_p_fbuffer, length);
51 *p_p_fbuffer += length;
54 Image* LoadPNGBuff (unsigned char* fbuffer)
56 png_byte** row_pointers;
62 // http://www.libpng.org/pub/png/libpng-manual.html
64 png_structp png_ptr = png_create_read_struct
65 (PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
66 user_error_fn, user_warning_fn);
69 globalErrorStream() << "libpng error: png_create_read_struct\n";
73 png_infop info_ptr = png_create_info_struct(png_ptr);
75 png_destroy_read_struct(&png_ptr,
76 (png_infopp)NULL, (png_infopp)NULL);
77 globalErrorStream() << "libpng error: png_create_info_struct (info_ptr)\n";
81 png_infop end_info = png_create_info_struct(png_ptr);
83 png_destroy_read_struct(&png_ptr, &info_ptr,
85 globalErrorStream() << "libpng error: png_create_info_struct (end_info)\n";
89 // configure the read function
90 png_set_read_fn(png_ptr, (png_voidp)&p_fbuffer, (png_rw_ptr)&user_read_data);
92 if (setjmp(png_jmpbuf(png_ptr))) {
93 png_destroy_read_struct(&png_ptr, &info_ptr,
98 png_read_info(png_ptr, info_ptr);
100 int bit_depth = png_get_bit_depth(png_ptr, info_ptr);
101 int color_type = png_get_color_type(png_ptr, info_ptr);
103 // we want to treat all images the same way
104 // The following code transforms grayscale images of less than 8 to 8 bits,
105 // changes paletted images to RGB, and adds a full alpha channel if there is
106 // transparency information in a tRNS chunk.
108 if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
109 png_set_gray_to_rgb(png_ptr);
110 else if (color_type == PNG_COLOR_TYPE_PALETTE)
111 png_set_palette_to_rgb(png_ptr);
113 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
114 png_set_expand_gray_1_2_4_to_8(png_ptr);
116 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
117 png_set_tRNS_to_alpha(png_ptr);
119 if ( ! ( color_type & PNG_COLOR_MASK_ALPHA ) ) {
120 // Set the background color to draw transparent and alpha images over.
121 png_color_16 my_background, *image_background;
123 if (png_get_bKGD(png_ptr, info_ptr, &image_background))
124 png_set_background(png_ptr, image_background,
125 PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
127 png_set_background(png_ptr, &my_background,
128 PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
130 // Add alpha byte after each RGB triplet
131 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
134 // read the sucker in one chunk
135 png_read_update_info(png_ptr, info_ptr);
137 color_type = png_get_color_type(png_ptr, info_ptr);
138 bit_depth = png_get_bit_depth(png_ptr, info_ptr);
140 int width = png_get_image_width(png_ptr, info_ptr);
141 int height = png_get_image_height(png_ptr, info_ptr);
143 // allocate the pixel buffer, and the row pointers
144 RGBAImage* image = new RGBAImage(width, height);
146 row_pointers = (png_byte**) malloc((height) * sizeof(png_byte*));
149 for(i = 0; i < (height); i++)
150 row_pointers[i] = (png_byte*)(image->getRGBAPixels()) + i * 4 * (width);
153 png_read_image(png_ptr, row_pointers);
155 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
156 png_read_end(png_ptr, info_ptr);
158 /* free up the memory structure */
159 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
166 Image* LoadPNG(ArchiveFile& file)
168 ScopedArchiveBuffer buffer(file);
169 return LoadPNGBuff( buffer.buffer );
173 #include "modulesystem/singletonmodule.h"
176 class ImageDependencies : public GlobalFileSystemModuleRef
182 _QERPlugImageTable m_imagepng;
184 typedef _QERPlugImageTable Type;
185 STRING_CONSTANT(Name, "png");
189 m_imagepng.loadImage = LoadPNG;
191 _QERPlugImageTable* getTable()
197 typedef SingletonModule<ImagePNGAPI, ImageDependencies> ImagePNGModule;
199 ImagePNGModule g_ImagePNGModule;
202 extern "C" void RADIANT_DLLEXPORT Radiant_RegisterModules(ModuleServer& server)
204 initialiseModule(server);
206 g_ImagePNGModule.selfRegister();