2 Copyright (C) 2003, 2010 - Wolfire Games
3 Copyright (C) 2010-2017 - 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"
34 /* These two are needed for screenshot */
35 extern int kContextWidth;
36 extern int kContextHeight;
38 static bool load_png(const char* fname, ImageRec& tex);
39 static bool load_jpg(const char* fname, ImageRec& tex);
40 static bool save_screenshot_png(const char* fname);
44 data = (GLubyte*)malloc(1024 * 1024 * 4);
53 bool load_image(const char* file_name, ImageRec& tex)
55 Game::LoadingScreen();
57 if (tex.data == NULL) {
61 const char* ptr = strrchr((char*)file_name, '.');
63 if (strcasecmp(ptr + 1, "png") == 0) {
64 return load_png(file_name, tex);
65 } else if (strcasecmp(ptr + 1, "jpg") == 0) {
66 return load_jpg(file_name, tex);
70 std::cerr << "Unsupported image type" << std::endl;
74 bool save_screenshot(const char* file_name)
76 const char* ptr = strrchr((char*)file_name, '.');
78 if (strcasecmp(ptr + 1, "png") == 0) {
79 return save_screenshot_png((Folders::getScreenshotDir() + '/' + file_name).c_str());
83 std::cerr << "Unsupported image type" << std::endl;
89 struct jpeg_error_mgr pub; /* "public" fields */
90 jmp_buf setjmp_buffer; /* for return to caller */
92 typedef struct my_error_mgr* my_error_ptr;
94 static void my_error_exit(j_common_ptr cinfo)
96 struct my_error_mgr* err = (struct my_error_mgr*)cinfo->err;
97 longjmp(err->setjmp_buffer, 1);
100 /* stolen from public domain example.c code in libjpg distribution. */
101 static bool load_jpg(const char* file_name, ImageRec& tex)
103 struct jpeg_decompress_struct cinfo;
104 struct my_error_mgr jerr;
105 JSAMPROW buffer[1]; /* Output row buffer */
106 int row_stride; /* physical row width in output buffer */
108 FILE* infile = fopen(file_name, "rb");
110 if (infile == NULL) {
111 perror((std::string("Couldn't open file ") + file_name).c_str());
115 cinfo.err = jpeg_std_error(&jerr.pub);
116 jerr.pub.error_exit = my_error_exit;
117 if (setjmp(jerr.setjmp_buffer)) {
118 jpeg_destroy_decompress(&cinfo);
123 jpeg_create_decompress(&cinfo);
124 jpeg_stdio_src(&cinfo, infile);
125 (void)jpeg_read_header(&cinfo, TRUE);
127 cinfo.out_color_space = JCS_RGB;
128 cinfo.quantize_colors = FALSE;
129 (void)jpeg_calc_output_dimensions(&cinfo);
130 (void)jpeg_start_decompress(&cinfo);
132 row_stride = cinfo.output_width * cinfo.output_components;
133 tex.sizeX = cinfo.output_width;
134 tex.sizeY = cinfo.output_height;
137 while (cinfo.output_scanline < cinfo.output_height) {
138 buffer[0] = (JSAMPROW)(char*)tex.data +
139 ((cinfo.output_height - 1) - cinfo.output_scanline) * row_stride;
140 (void)jpeg_read_scanlines(&cinfo, buffer, 1);
143 (void)jpeg_finish_decompress(&cinfo);
144 jpeg_destroy_decompress(&cinfo);
150 /* stolen from public domain example.c code in libpng distribution. */
151 static bool load_png(const char* file_name, ImageRec& tex)
153 bool hasalpha = false;
154 png_structp png_ptr = NULL;
155 png_infop info_ptr = NULL;
156 png_uint_32 width, height;
157 int bit_depth, color_type, interlace_type;
159 png_byte** row_pointers = NULL;
161 FILE* fp = fopen(file_name, "rb");
164 perror((std::string("Couldn't open file ") + file_name).c_str());
168 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
169 if (png_ptr == NULL) {
173 info_ptr = png_create_info_struct(png_ptr);
174 if (info_ptr == NULL) {
178 if (setjmp(png_jmpbuf(png_ptr))) {
182 png_init_io(png_ptr, fp);
183 png_read_png(png_ptr, info_ptr,
184 PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_PACKING,
186 png_get_IHDR(png_ptr, info_ptr, &width, &height,
187 &bit_depth, &color_type, &interlace_type, NULL, NULL);
189 if (bit_depth != 8) { // transform SHOULD handle this...
193 if (color_type & PNG_COLOR_MASK_PALETTE) { // !!! FIXME?
197 if ((color_type & PNG_COLOR_MASK_COLOR) == 0) { // !!! FIXME?
201 hasalpha = ((color_type & PNG_COLOR_MASK_ALPHA) != 0);
202 row_pointers = png_get_rows(png_ptr, info_ptr);
208 png_byte* dst = tex.data;
209 for (int i = height - 1; i >= 0; i--) {
210 png_byte* src = row_pointers[i];
211 for (unsigned j = 0; j < width; j++) {
223 png_byte* dst = tex.data;
224 int pitch = width * 4;
225 for (int i = height - 1; i >= 0; i--, dst += pitch) {
226 memcpy(dst, row_pointers[i], pitch);
237 cerr << "There was a problem loading " << file_name << endl;
239 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
246 static bool save_screenshot_png(const char* file_name)
249 png_structp png_ptr = NULL;
250 png_infop info_ptr = NULL;
254 fp = fopen(file_name, "wb");
256 perror((std::string("Couldn't open file ") + file_name).c_str());
260 png_bytep* row_pointers = new png_bytep[kContextHeight];
261 png_bytep screenshot = new png_byte[kContextWidth * kContextHeight * 3];
262 if ((!screenshot) || (!row_pointers)) {
267 glReadPixels(0, 0, kContextWidth, kContextHeight,
268 GL_RGB, GL_UNSIGNED_BYTE, screenshot);
269 if (glGetError() != GL_NO_ERROR) {
273 for (int i = 0; i < kContextHeight; i++) {
274 row_pointers[i] = screenshot + ((kContextWidth * ((kContextHeight - 1) - i)) * 3);
277 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
278 if (png_ptr == NULL) {
282 info_ptr = png_create_info_struct(png_ptr);
283 if (info_ptr == NULL) {
287 if (setjmp(png_jmpbuf(png_ptr))) {
291 png_init_io(png_ptr, fp);
293 if (setjmp(png_jmpbuf(png_ptr))) {
297 png_set_IHDR(png_ptr, info_ptr, kContextWidth, kContextHeight,
298 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
299 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
301 png_write_info(png_ptr, info_ptr);
303 if (setjmp(png_jmpbuf(png_ptr))) {
307 png_write_image(png_ptr, row_pointers);
309 if (setjmp(png_jmpbuf(png_ptr))) {
313 png_write_end(png_ptr, NULL);
317 png_destroy_write_struct(&png_ptr, &info_ptr);
319 delete[] row_pointers;