| 1 | #include <stdio.h> |
| 2 | #include <string.h> |
| 3 | #include <png.h> |
| 4 | #include "readpng.h" |
| 5 | #include "lprintf.h" |
| 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 | { |
| 22 | lprintf(__FILE__ ": failed to open: %s\n", fname); |
| 23 | return; |
| 24 | } |
| 25 | |
| 26 | png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
| 27 | if (!png_ptr) |
| 28 | { |
| 29 | lprintf(__FILE__ ": png_create_read_struct() failed\n"); |
| 30 | fclose(fp); |
| 31 | return; |
| 32 | } |
| 33 | |
| 34 | info_ptr = png_create_info_struct(png_ptr); |
| 35 | if (!info_ptr) |
| 36 | { |
| 37 | lprintf(__FILE__ ": png_create_info_struct() failed\n"); |
| 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 | { |
| 47 | lprintf(__FILE__ ": png_get_rows() failed\n"); |
| 48 | goto done; |
| 49 | } |
| 50 | |
| 51 | // lprintf("%s: %ix%i @ %ibpp\n", fname, (int)info_ptr->width, (int)info_ptr->height, info_ptr->pixel_depth); |
| 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 | { |
| 61 | lprintf(__FILE__ ": bg image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth); |
| 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 | { |
| 89 | lprintf(__FILE__ ": unexpected font image size %ix%i, needed 128x160\n", |
| 90 | (int)info_ptr->width, (int)info_ptr->height); |
| 91 | break; |
| 92 | } |
| 93 | if (info_ptr->pixel_depth != 8) |
| 94 | { |
| 95 | lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth); |
| 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 | { |
| 119 | lprintf(__FILE__ ": unexpected selector image size %ix%i, needed 8x10\n", |
| 120 | (int)info_ptr->width, (int)info_ptr->height); |
| 121 | break; |
| 122 | } |
| 123 | if (info_ptr->pixel_depth != 8) |
| 124 | { |
| 125 | lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth); |
| 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 | |