1 

     2 #include "../../stdafx.h"

     3 #include "../../openttd.h"

     4 #include "../../variables.h"

     5 #include "../../macros.h"

     6 #include "../../debug.h"

     7 #include "../../functions.h"

     8 #include "../../gfx.h"

     9 #include "../../fileio.h"

    10 

    11 #include "splash.h"

    12 

    13 #ifdef WITH_PNG

    14 

    15 #include <png.h>

    16 

    17 static void PNGAPI png_my_error(png_structp png_ptr, png_const_charp message)

    18 {

    19 	DEBUG(misc, 0) ("ERROR(libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr));

    20 	longjmp(png_ptr->jmpbuf, 1);

    21 }

    22 

    23 static void PNGAPI png_my_warning(png_structp png_ptr, png_const_charp message)

    24 {

    25 	DEBUG(misc, 0) ("WARNING(libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr));

    26 }

    27 

    28 void DisplaySplashImage(void)

    29 {

    30 	png_byte header[8];

    31 	FILE *f;

    32 	png_structp png_ptr;

    33 	png_infop info_ptr, end_info;

    34 	uint width, height, bit_depth, color_type;

    35 	png_colorp palette;

    36 	int num_palette;

    37 	png_bytep *row_pointers;

    38 	uint8 *src, *dst;

    39 	uint y;

    40 	uint xoff, yoff;

    41 	int i;

    42 

    43 	f = FioFOpenFile(SPLASH_IMAGE_FILE);

    44 	if (f == NULL) return;

    45 

    46 	fread(header, 1, 8, f);

    47 	if (png_sig_cmp(header, 0, 8) != 0) {

    48 		fclose(f);

    49 		return;

    50 	}

    51 

    52 	png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, (png_voidp) NULL, png_my_error, png_my_warning);

    53 

    54 	if (png_ptr == NULL) {

    55 		fclose(f);

    56 		return;

    57 	}

    58 

    59 	info_ptr = png_create_info_struct(png_ptr);

    60 	if (info_ptr == NULL) {

    61 		png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);

    62 		fclose(f);

    63 		return;

    64 	}

    65 

    66 	end_info = png_create_info_struct(png_ptr);

    67 	if (end_info == NULL) {

    68 		png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);

    69 		fclose(f);

    70 		return;

    71 	}

    72 

    73 	if (setjmp(png_jmpbuf(png_ptr))) {

    74 		png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

    75 		fclose(f);

    76 		return;

    77 	}

    78 

    79 	png_init_io(png_ptr, f);

    80 	png_set_sig_bytes(png_ptr, 8);

    81 

    82 	png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);

    83 

    84 	width            = png_get_image_width(png_ptr, info_ptr);

    85 	height           = png_get_image_height(png_ptr, info_ptr);

    86 	bit_depth        = png_get_bit_depth(png_ptr, info_ptr);

    87 	color_type       = png_get_color_type(png_ptr, info_ptr);

    88 

    89 	if(color_type != PNG_COLOR_TYPE_PALETTE || bit_depth != 8) {

    90 		png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

    91 		fclose(f);

    92 		return;

    93 	}

    94 

    95 	if(!png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE)) {

    96 		png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

    97 		fclose(f);

    98 		return;

    99 	}

   100 

   101 	png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);

   102 

   103 	row_pointers = png_get_rows(png_ptr, info_ptr);

   104 

   105 	memset(_screen.dst_ptr, 0xff, _screen.pitch * _screen.height);

   106 

   107 	if(width > (uint) _screen.width)

   108 		width = _screen.width;

   109 	if(height > (uint) _screen.height)

   110 		height = _screen.height;

   111 

   112 	xoff = (_screen.width - width) / 2;

   113 	yoff = (_screen.height - height) / 2;

   114 	for(y = 0; y < height; y++) {

   115 		src = row_pointers[y];

   116 		dst = ((uint8 *) _screen.dst_ptr) + (yoff + y) * _screen.pitch + xoff;

   117 

   118 		memcpy(dst, src, width);

   119 	}

   120 

   121 	for (i = 0; i < num_palette; i++) {

   122 		_cur_palette[i].r = palette[i].red;

   123 		_cur_palette[i].g = palette[i].green;

   124 		_cur_palette[i].b = palette[i].blue;

   125 	}

   126 

   127 	_cur_palette[0xff].r = 0;

   128 	_cur_palette[0xff].g = 0;

   129 	_cur_palette[0xff].b = 0;

   130 

   131 	_pal_first_dirty = 0;

   132 	_pal_last_dirty = 0xff;

   133 

   134 	png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

   135 	fclose(f);

   136 	return;

   137 }

   138 

   139 

   140 

   141 #else // WITH_PNG

   142 

   143 void DisplaySplashImage(void) {}

   144 

   145 #endif // WITH_PNG