src/os/macosx/splash.cpp

   1 /* $Id: splash.cpp 26209 2014-01-02 22:41:58Z 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
  10 /** @file splash.cpp Splash screen support for OSX. */
  11
  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
  28 /**
  29  * Handle pnglib error.
  30  *
  31  * @param png_ptr Pointer to png struct.
  32  * @param message Error message text.
  33  */
  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
  40 /**
  41  * Handle warning in pnglib.
  42  *
  43  * @param png_ptr Pointer to png struct.
  44  * @param message Warning message text.
  45  */
  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
  51 /**
  52  * Display a splash image shown on startup (WITH_PNG).
  53  */
  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
 182 /**
 183  * Empty 'Display a splash image' routine (WITHOUT_PNG).
 184  */
 185 void DisplaySplashImage() {}
 186
 187 #endif /* WITH_PNG */