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splash.cpp
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1 /* $Id: splash.cpp 26482 2014-04-23 20:13:33Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8 */
9
12 #include "../../stdafx.h"
13 #include "../../openttd.h"
14 #include "../../debug.h"
15 #include "../../gfx_func.h"
16 #include "../../fileio_func.h"
17 #include "../../blitter/factory.hpp"
18 #include "../../core/mem_func.hpp"
19
20 #include "splash.h"
21
22 #ifdef WITH_PNG
23
24 #include <png.h>
25
26 #include "../../safeguards.h"
27
34 static void PNGAPI png_my_error(png_structp png_ptr, png_const_charp message)
35 {
36 DEBUG(misc, 0, "[libpng] error: %s - %s", message, (char *)png_get_error_ptr(png_ptr));
37 longjmp(png_jmpbuf(png_ptr), 1);
38 }
39
46 static void PNGAPI png_my_warning(png_structp png_ptr, png_const_charp message)
47 {
48 DEBUG(misc, 1, "[libpng] warning: %s - %s", message, (char *)png_get_error_ptr(png_ptr));
49 }
50
54 void DisplaySplashImage()
55 {
56 FILE *f = FioFOpenFile(SPLASH_IMAGE_FILE, "r", BASESET_DIR);
57 if (f == NULL) return;
58
59 png_byte header[8];
60 fread(header, sizeof(png_byte), 8, f);
61 if (png_sig_cmp(header, 0, 8) != 0) {
62 fclose(f);
63 return;
64 }
65
66 png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp) NULL, png_my_error, png_my_warning);
67
68 if (png_ptr == NULL) {
69 fclose(f);
70 return;
71 }
72
73 png_infop info_ptr = png_create_info_struct(png_ptr);
74 if (info_ptr == NULL) {
75 png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
76 fclose(f);
77 return;
78 }
79
80 png_infop end_info = png_create_info_struct(png_ptr);
81 if (end_info == NULL) {
82 png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
83 fclose(f);
84 return;
85 }
86
87 if (setjmp(png_jmpbuf(png_ptr))) {
88 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
89 fclose(f);
90 return;
91 }
92
93 png_init_io(png_ptr, f);
94 png_set_sig_bytes(png_ptr, 8);
95
96 png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
97
98 uint width = png_get_image_width(png_ptr, info_ptr);
99 uint height = png_get_image_height(png_ptr, info_ptr);
100 uint bit_depth = png_get_bit_depth(png_ptr, info_ptr);
101 uint color_type = png_get_color_type(png_ptr, info_ptr);
102
103 if (color_type != PNG_COLOR_TYPE_PALETTE || bit_depth != 8) {
104 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
105 fclose(f);
106 return;
107 }
108
109 if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE)) {
110 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
111 fclose(f);
112 return;
113 }
114
115 png_colorp palette;
116 int num_palette;
117 png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
118
119 png_bytep *row_pointers = png_get_rows(png_ptr, info_ptr);
120
121 if (width > (uint) _screen.width) width = _screen.width;
122 if (height > (uint) _screen.height) height = _screen.height;
123
124 uint xoff = (_screen.width - width) / 2;
125 uint yoff = (_screen.height - height) / 2;
126
127 switch (BlitterFactory::GetCurrentBlitter()->GetScreenDepth()) {
128 case 8: {
129 uint8 *dst_ptr = (uint8 *)_screen.dst_ptr;
130 /* Initialize buffer */
131 MemSetT(dst_ptr, 0xff, _screen.pitch * _screen.height);
132
133 for (uint y = 0; y < height; y++) {
134 uint8 *src = row_pointers[y];
135 uint8 *dst = dst_ptr + (yoff + y) * _screen.pitch + xoff;
136
137 memcpy(dst, src, width);
138 }
139
140 for (int i = 0; i < num_palette; i++) {
141 _cur_palette.palette[i].a = i == 0 ? 0 : 0xff;
142 _cur_palette.palette[i].r = palette[i].red;
143 _cur_palette.palette[i].g = palette[i].green;
144 _cur_palette.palette[i].b = palette[i].blue;
145 }
146
147 _cur_palette.palette[0xff].a = 0xff;
148 _cur_palette.palette[0xff].r = 0;
149 _cur_palette.palette[0xff].g = 0;
150 _cur_palette.palette[0xff].b = 0;
151
152 _cur_palette.first_dirty = 0;
153 _cur_palette.count_dirty = 256;
154 break;
155 }
156 case 32: {
157 uint32 *dst_ptr = (uint32 *)_screen.dst_ptr;
158 /* Initialize buffer */
159 MemSetT(dst_ptr, 0, _screen.pitch * _screen.height);
160
161 for (uint y = 0; y < height; y++) {
162 uint8 *src = row_pointers[y];
163 uint32 *dst = dst_ptr + (yoff + y) * _screen.pitch + xoff;
164
165 for (uint x = 0; x < width; x++) {
166 dst[x] = palette[src[x]].blue | (palette[src[x]].green << 8) | (palette[src[x]].red << 16) | 0xff000000;
167 }
168 }
169 break;
170 }
171 }
172
173 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
174 fclose(f);
175 return;
176 }
177
178
179
180 #else /* WITH_PNG */
181
185 void DisplaySplashImage() {}
186
187 #endif /* WITH_PNG */