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;
86 struct jpeg_error_mgr pub; /* "public" fields */
87 jmp_buf setjmp_buffer; /* for return to caller */
89 typedef struct my_error_mgr* my_error_ptr;
91 static void my_error_exit(j_common_ptr cinfo)
93 struct my_error_mgr* err = (struct my_error_mgr*)cinfo->err;
94 longjmp(err->setjmp_buffer, 1);
97 /* stolen from public domain example.c code in libjpg distribution. */
98 static bool load_jpg(const char* file_name, ImageRec& tex)
100 struct jpeg_decompress_struct cinfo;
101 struct my_error_mgr jerr;
102 JSAMPROW buffer[1]; /* Output row buffer */
103 int row_stride; /* physical row width in output buffer */
105 FILE* infile = fopen(file_name, "rb");
107 if (infile == NULL) {
108 perror((std::string("Couldn't open file ") + file_name).c_str());
112 cinfo.err = jpeg_std_error(&jerr.pub);
113 jerr.pub.error_exit = my_error_exit;
114 if (setjmp(jerr.setjmp_buffer)) {
115 jpeg_destroy_decompress(&cinfo);
120 jpeg_create_decompress(&cinfo);
121 jpeg_stdio_src(&cinfo, infile);
122 (void)jpeg_read_header(&cinfo, TRUE);
124 cinfo.out_color_space = JCS_RGB;
125 cinfo.quantize_colors = 0;
126 (void)jpeg_calc_output_dimensions(&cinfo);
127 (void)jpeg_start_decompress(&cinfo);
129 row_stride = cinfo.output_width * cinfo.output_components;
130 tex.sizeX = cinfo.output_width;
131 tex.sizeY = cinfo.output_height;
134 while (cinfo.output_scanline < cinfo.output_height) {
135 buffer[0] = (JSAMPROW)(char*)tex.data +
136 ((cinfo.output_height - 1) - cinfo.output_scanline) * row_stride;
137 (void)jpeg_read_scanlines(&cinfo, buffer, 1);
140 (void)jpeg_finish_decompress(&cinfo);
141 jpeg_destroy_decompress(&cinfo);
147 /* stolen from public domain example.c code in libpng distribution. */
148 static bool load_png(const char* file_name, ImageRec& tex)
150 bool hasalpha = false;
151 png_structp png_ptr = NULL;
152 png_infop info_ptr = NULL;
153 png_uint_32 width, height;
154 int bit_depth, color_type, interlace_type;
156 png_byte** row_pointers = NULL;
158 FILE* fp = fopen(file_name, "rb");
161 perror((std::string("Couldn't open file ") + file_name).c_str());
165 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
169 info_ptr = png_create_info_struct(png_ptr);
170 if (info_ptr == NULL)
173 if (setjmp(png_jmpbuf(png_ptr)))
176 png_init_io(png_ptr, fp);
177 png_read_png(png_ptr, info_ptr,
178 PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_PACKING,
180 png_get_IHDR(png_ptr, info_ptr, &width, &height,
181 &bit_depth, &color_type, &interlace_type, NULL, NULL);
183 if (bit_depth != 8) // transform SHOULD handle this...
186 if (color_type & PNG_COLOR_MASK_PALETTE) // !!! FIXME?
189 if ((color_type & PNG_COLOR_MASK_COLOR) == 0) // !!! FIXME?
192 hasalpha = ((color_type & PNG_COLOR_MASK_ALPHA) != 0);
193 row_pointers = png_get_rows(png_ptr, info_ptr);
198 png_byte* dst = tex.data;
199 for (int i = height - 1; i >= 0; i--) {
200 png_byte* src = row_pointers[i];
201 for (unsigned j = 0; j < width; j++) {
213 png_byte* dst = tex.data;
214 int pitch = width * 4;
215 for (int i = height - 1; i >= 0; i--, dst += pitch)
216 memcpy(dst, row_pointers[i], pitch);
226 cerr << "There was a problem loading " << file_name << endl;
228 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
234 static bool save_screenshot_png(const char* file_name)
237 png_structp png_ptr = NULL;
238 png_infop info_ptr = NULL;
242 fp = fopen(file_name, "wb");
244 perror((std::string("Couldn't open file ") + file_name).c_str());
248 png_bytep* row_pointers = new png_bytep[kContextHeight];
249 png_bytep screenshot = new png_byte[kContextWidth * kContextHeight * 3];
250 if ((!screenshot) || (!row_pointers))
254 glReadPixels(0, 0, kContextWidth, kContextHeight,
255 GL_RGB, GL_UNSIGNED_BYTE, screenshot);
256 if (glGetError() != GL_NO_ERROR)
259 for (int i = 0; i < kContextHeight; i++)
260 row_pointers[i] = screenshot + ((kContextWidth * ((kContextHeight - 1) - i)) * 3);
262 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
266 info_ptr = png_create_info_struct(png_ptr);
267 if (info_ptr == NULL)
270 if (setjmp(png_jmpbuf(png_ptr)))
273 png_init_io(png_ptr, fp);
275 if (setjmp(png_jmpbuf(png_ptr)))
278 png_set_IHDR(png_ptr, info_ptr, kContextWidth, kContextHeight,
279 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
280 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
282 png_write_info(png_ptr, info_ptr);
284 if (setjmp(png_jmpbuf(png_ptr)))
287 png_write_image(png_ptr, row_pointers);
289 if (setjmp(png_jmpbuf(png_ptr)))
292 png_write_end(png_ptr, NULL);
296 png_destroy_write_struct(&png_ptr, &info_ptr);
298 delete[] row_pointers;