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1 | #include <stdio.h> |
2 | #include <string.h> |
3 | #include <png.h> |
4 | #include "readpng.h" |
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5 | #include "lprintf.h" |
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6 | |
7 | void readpng(void *dest, const char *fname, readpng_what what) |
8 | { |
9 | FILE *fp; |
10 | png_structp png_ptr = NULL; |
11 | png_infop info_ptr = NULL; |
12 | png_bytepp row_ptr = NULL; |
13 | |
14 | if (dest == NULL || fname == NULL) |
15 | { |
16 | return; |
17 | } |
18 | |
19 | fp = fopen(fname, "rb"); |
20 | if (fp == NULL) |
21 | { |
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22 | lprintf(__FILE__ ": failed to open: %s\n", fname); |
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23 | return; |
24 | } |
25 | |
26 | png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
27 | if (!png_ptr) |
28 | { |
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29 | lprintf(__FILE__ ": png_create_read_struct() failed\n"); |
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30 | fclose(fp); |
31 | return; |
32 | } |
33 | |
34 | info_ptr = png_create_info_struct(png_ptr); |
35 | if (!info_ptr) |
36 | { |
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37 | lprintf(__FILE__ ": png_create_info_struct() failed\n"); |
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38 | goto done; |
39 | } |
40 | |
41 | // Start reading |
42 | png_init_io(png_ptr, fp); |
43 | png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_PACKING, NULL); |
44 | row_ptr = png_get_rows(png_ptr, info_ptr); |
45 | if (row_ptr == NULL) |
46 | { |
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47 | lprintf(__FILE__ ": png_get_rows() failed\n"); |
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48 | goto done; |
49 | } |
50 | |
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51 | // lprintf("%s: %ix%i @ %ibpp\n", fname, (int)info_ptr->width, (int)info_ptr->height, info_ptr->pixel_depth); |
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52 | |
53 | switch (what) |
54 | { |
55 | case READPNG_BG: |
56 | { |
57 | int height, width, h; |
58 | unsigned short *dst = dest; |
59 | if (info_ptr->pixel_depth != 24) |
60 | { |
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61 | lprintf(__FILE__ ": bg image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth); |
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62 | break; |
63 | } |
64 | height = info_ptr->height; |
65 | if (height > 240) height = 240; |
66 | width = info_ptr->width; |
67 | if (width > 320) width = 320; |
68 | |
69 | for (h = 0; h < height; h++) |
70 | { |
71 | unsigned char *src = row_ptr[h]; |
72 | int len = width; |
73 | while (len--) |
74 | { |
75 | *dst++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3); |
76 | src += 3; |
77 | } |
78 | dst += 320 - width; |
79 | } |
80 | break; |
81 | } |
82 | |
83 | case READPNG_FONT: |
84 | { |
85 | int x, y, x1, y1; |
86 | unsigned char *dst = dest; |
87 | if (info_ptr->width != 128 || info_ptr->height != 160) |
88 | { |
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89 | lprintf(__FILE__ ": unexpected font image size %ix%i, needed 128x160\n", |
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90 | (int)info_ptr->width, (int)info_ptr->height); |
91 | break; |
92 | } |
93 | if (info_ptr->pixel_depth != 8) |
94 | { |
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95 | lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth); |
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96 | break; |
97 | } |
98 | for (y = 0; y < 16; y++) |
99 | { |
100 | for (x = 0; x < 16; x++) |
101 | { |
102 | for (y1 = 0; y1 < 10; y1++) |
103 | { |
104 | unsigned char *src = row_ptr[y*10 + y1] + x*8; |
105 | for (x1 = 8/2; x1 > 0; x1--, src+=2) |
106 | *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4); |
107 | } |
108 | } |
109 | } |
110 | break; |
111 | } |
112 | |
113 | case READPNG_SELECTOR: |
114 | { |
115 | int x1, y1; |
116 | unsigned char *dst = dest; |
117 | if (info_ptr->width != 8 || info_ptr->height != 10) |
118 | { |
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119 | lprintf(__FILE__ ": unexpected selector image size %ix%i, needed 8x10\n", |
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120 | (int)info_ptr->width, (int)info_ptr->height); |
121 | break; |
122 | } |
123 | if (info_ptr->pixel_depth != 8) |
124 | { |
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125 | lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth); |
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126 | break; |
127 | } |
128 | for (y1 = 0; y1 < 10; y1++) |
129 | { |
130 | unsigned char *src = row_ptr[y1]; |
131 | for (x1 = 8/2; x1 > 0; x1--, src+=2) |
132 | *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4); |
133 | } |
134 | break; |
135 | } |
136 | } |
137 | |
138 | |
139 | done: |
140 | png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL); |
141 | fclose(fp); |
142 | } |
143 | |
144 | |