2 Copyright (C) 2003, 2010 - Wolfire Games
3 Copyright (C) 2010-2016 - Lugaru contributors (see AUTHORS file)
5 This file is part of Lugaru.
7 Lugaru 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 Lugaru 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 Lugaru. If not, see <http://www.gnu.org/licenses/>.
21 #include "Utils/ImageIO.hpp"
24 #include "Utils/Folders.hpp"
31 /* These two are needed for screenshot */
32 extern int kContextWidth;
33 extern int kContextHeight;
35 static bool load_png(const char * fname, ImageRec & tex);
36 static bool load_jpg(const char * fname, ImageRec & tex);
37 static bool save_screenshot_png(const char * fname);
41 data = ( GLubyte* )malloc( 1024 * 1024 * 4 );
50 bool load_image(const char *file_name, ImageRec &tex)
52 Game::LoadingScreen();
54 if ( tex.data == NULL ) {
58 const char *ptr = strrchr((char *)file_name, '.');
60 if (strcasecmp(ptr + 1, "png") == 0) {
61 return load_png(file_name, tex);
62 } else if (strcasecmp(ptr + 1, "jpg") == 0) {
63 return load_jpg(file_name, tex);
67 std::cerr << "Unsupported image type" << std::endl;
71 bool save_screenshot(const char *file_name)
73 const char *ptr = strrchr((char *)file_name, '.');
75 if (strcasecmp(ptr + 1, "png") == 0) {
76 return save_screenshot_png((Folders::getScreenshotDir() + '/' + file_name).c_str());
80 std::cerr << "Unsupported image type" << std::endl;
85 struct jpeg_error_mgr pub; /* "public" fields */
86 jmp_buf setjmp_buffer; /* for return to caller */
88 typedef struct my_error_mgr * my_error_ptr;
90 static void my_error_exit(j_common_ptr cinfo)
92 struct my_error_mgr *err = (struct my_error_mgr *)cinfo->err;
93 longjmp(err->setjmp_buffer, 1);
96 /* stolen from public domain example.c code in libjpg distribution. */
97 static bool load_jpg(const char *file_name, ImageRec &tex)
99 struct jpeg_decompress_struct cinfo;
100 struct my_error_mgr jerr;
101 JSAMPROW buffer[1]; /* Output row buffer */
102 int row_stride; /* physical row width in output buffer */
104 FILE *infile = fopen(file_name, "rb");
106 if (infile == NULL) {
107 perror((std::string("Couldn't open file ") + file_name).c_str());
111 cinfo.err = jpeg_std_error(&jerr.pub);
112 jerr.pub.error_exit = my_error_exit;
113 if (setjmp(jerr.setjmp_buffer)) {
114 jpeg_destroy_decompress(&cinfo);
119 jpeg_create_decompress(&cinfo);
120 jpeg_stdio_src(&cinfo, infile);
121 (void) jpeg_read_header(&cinfo, TRUE);
123 cinfo.out_color_space = JCS_RGB;
124 cinfo.quantize_colors = 0;
125 (void) jpeg_calc_output_dimensions(&cinfo);
126 (void) jpeg_start_decompress(&cinfo);
128 row_stride = cinfo.output_width * cinfo.output_components;
129 tex.sizeX = cinfo.output_width;
130 tex.sizeY = cinfo.output_height;
133 while (cinfo.output_scanline < cinfo.output_height) {
134 buffer[0] = (JSAMPROW)(char *)tex.data +
135 ((cinfo.output_height - 1) - cinfo.output_scanline) * row_stride;
136 (void) jpeg_read_scanlines(&cinfo, buffer, 1);
139 (void) jpeg_finish_decompress(&cinfo);
140 jpeg_destroy_decompress(&cinfo);
146 /* stolen from public domain example.c code in libpng distribution. */
147 static bool load_png(const char *file_name, ImageRec &tex)
149 bool hasalpha = false;
150 png_structp png_ptr = NULL;
151 png_infop info_ptr = NULL;
152 png_uint_32 width, height;
153 int bit_depth, color_type, interlace_type;
155 png_byte **row_pointers = NULL;
157 FILE *fp = fopen(file_name, "rb");
160 perror((std::string("Couldn't open file ") + file_name).c_str());
164 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
168 info_ptr = png_create_info_struct(png_ptr);
169 if (info_ptr == NULL)
172 if (setjmp(png_jmpbuf(png_ptr)))
175 png_init_io(png_ptr, fp);
176 png_read_png(png_ptr, info_ptr,
177 PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_PACKING,
179 png_get_IHDR(png_ptr, info_ptr, &width, &height,
180 &bit_depth, &color_type, &interlace_type, NULL, NULL);
182 if (bit_depth != 8) // transform SHOULD handle this...
185 if (color_type & PNG_COLOR_MASK_PALETTE) // !!! FIXME?
188 if ((color_type & PNG_COLOR_MASK_COLOR) == 0) // !!! FIXME?
191 hasalpha = ((color_type & PNG_COLOR_MASK_ALPHA) != 0);
192 row_pointers = png_get_rows(png_ptr, info_ptr);
197 png_byte *dst = tex.data;
198 for (int i = height - 1; i >= 0; i--) {
199 png_byte *src = row_pointers[i];
200 for (unsigned j = 0; j < width; j++) {
212 png_byte *dst = tex.data;
213 int pitch = width * 4;
214 for (int i = height - 1; i >= 0; i--, dst += pitch)
215 memcpy(dst, row_pointers[i], pitch);
225 cerr << "There was a problem loading " << file_name << endl;
227 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
233 static bool save_screenshot_png(const char *file_name)
236 png_structp png_ptr = NULL;
237 png_infop info_ptr = NULL;
241 fp = fopen(file_name, "wb");
243 perror((std::string("Couldn't open file ") + file_name).c_str());
247 png_bytep *row_pointers = new png_bytep[kContextHeight];
248 png_bytep screenshot = new png_byte[kContextWidth * kContextHeight * 3];
249 if ((!screenshot) || (!row_pointers))
253 glReadPixels(0, 0, kContextWidth, kContextHeight,
254 GL_RGB, GL_UNSIGNED_BYTE, screenshot);
255 if (glGetError() != GL_NO_ERROR)
258 for (int i = 0; i < kContextHeight; i++)
259 row_pointers[i] = screenshot + ((kContextWidth * ((kContextHeight - 1) - i)) * 3);
261 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
265 info_ptr = png_create_info_struct(png_ptr);
266 if (info_ptr == NULL)
269 if (setjmp(png_jmpbuf(png_ptr)))
272 png_init_io(png_ptr, fp);
274 if (setjmp(png_jmpbuf(png_ptr)))
277 png_set_IHDR(png_ptr, info_ptr, kContextWidth, kContextHeight,
278 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
279 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
281 png_write_info(png_ptr, info_ptr);
283 if (setjmp(png_jmpbuf(png_ptr)))
286 png_write_image(png_ptr, row_pointers);
288 if (setjmp(png_jmpbuf(png_ptr)))
291 png_write_end(png_ptr, NULL);
295 png_destroy_write_struct(&png_ptr, &info_ptr);
297 delete[] row_pointers;