2 * (C) GraÅžvydas "notaz" Ignotas, 2008-2011
4 * This work is licensed under the terms of any of these licenses
6 * - GNU GPL, version 2 or later.
7 * - GNU LGPL, version 2.1 or later.
9 * See the COPYING file in the top-level directory.
19 int readpng(void *dest, const char *fname, readpng_what what, int req_w, int req_h)
22 png_structp png_ptr = NULL;
23 png_infop info_ptr = NULL;
24 png_bytepp row_ptr = NULL;
27 if (dest == NULL || fname == NULL)
32 fp = fopen(fname, "rb");
35 lprintf(__FILE__ ": failed to open: %s\n", fname);
39 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
42 lprintf(__FILE__ ": png_create_read_struct() failed\n");
47 info_ptr = png_create_info_struct(png_ptr);
50 lprintf(__FILE__ ": png_create_info_struct() failed\n");
55 png_init_io(png_ptr, fp);
56 png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_PACKING, NULL);
57 row_ptr = png_get_rows(png_ptr, info_ptr);
60 lprintf(__FILE__ ": png_get_rows() failed\n");
64 // lprintf("%s: %ix%i @ %ibpp\n", fname, (int)png_get_image_width(png_ptr, info_ptr),
65 // (int)png_get_image_height(png_ptr, info_ptr), png_get_bit_depth(png_ptr, info_ptr));
71 int height, width, h, x_ofs = 0, y_ofs = 0;
72 unsigned short *dst = dest;
74 if (png_get_bit_depth(png_ptr, info_ptr) != 8)
76 lprintf(__FILE__ ": bg image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr));
79 width = png_get_image_width(png_ptr, info_ptr);
81 x_ofs = (width - req_w) / 2;
84 dst += (req_w - width) / 2;
85 height = png_get_image_height(png_ptr, info_ptr);
87 y_ofs = (height - req_h) / 2;
90 dst += (req_h - height) / 2 * req_w;
92 for (h = 0; h < height; h++)
94 unsigned char *src = row_ptr[h + y_ofs] + x_ofs * 3;
99 *dst++ = ((src[2]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[0] >> 3); // BGR
101 *dst++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3); // RGB
105 dst += req_w - width;
113 unsigned char *dst = dest;
114 if (png_get_image_width(png_ptr, info_ptr) != req_w || png_get_image_height(png_ptr, info_ptr) != req_h)
116 lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n",
117 (int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h);
120 if (png_get_bit_depth(png_ptr, info_ptr) != 8)
122 lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr));
125 for (y = 0; y < 16; y++)
127 for (x = 0; x < 16; x++)
129 /* 16x16 grid of syms */
130 int sym_w = req_w / 16;
131 int sym_h = req_h / 16;
132 for (y1 = 0; y1 < sym_h; y1++)
134 unsigned char *src = row_ptr[y*sym_h + y1] + x*sym_w;
135 for (x1 = sym_w/2; x1 > 0; x1--, src+=2)
136 *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
143 case READPNG_SELECTOR:
146 unsigned char *dst = dest;
147 if (png_get_image_width(png_ptr, info_ptr) != req_w || png_get_image_height(png_ptr, info_ptr) != req_h)
149 lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n",
150 (int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h);
153 if (png_get_bit_depth(png_ptr, info_ptr) != 8)
155 lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr));
158 for (y1 = 0; y1 < req_h; y1++)
160 unsigned char *src = row_ptr[y1];
161 for (x1 = req_w/2; x1 > 0; x1--, src+=2)
162 *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
169 int height, width, h;
170 unsigned char *dst = dest;
171 if (png_get_bit_depth(png_ptr, info_ptr) != 8)
173 lprintf(__FILE__ ": image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr));
176 width = png_get_image_width(png_ptr, info_ptr);
179 height = png_get_image_height(png_ptr, info_ptr);
183 for (h = 0; h < height; h++)
186 unsigned char *src = row_ptr[h];
187 dst += (req_w - width) * 3;
188 for (len = width; len > 0; len--, dst+=3, src+=3)
189 dst[0] = src[2], dst[1] = src[1], dst[2] = src[0];
198 png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL);
203 int writepng(const char *fname, unsigned short *src, int w, int h)
205 png_structp png_ptr = NULL;
206 png_infop info_ptr = NULL;
207 png_bytepp row_pointers;
211 f = fopen(fname, "wb");
213 lprintf(__FILE__ ": failed to open \"%s\"\n", fname);
217 row_pointers = calloc(h, sizeof(row_pointers[0]));
218 if (row_pointers == NULL)
221 for (i = 0; i < h; i++) {
222 unsigned char *dst = malloc(w * 3);
225 row_pointers[i] = dst;
226 for (j = 0; j < w; j++, src++, dst += 3) {
227 dst[0] = (*src & 0xf800) >> 8;
228 dst[1] = (*src & 0x07e0) >> 3;
229 dst[2] = (*src & 0x001f) << 3;
233 /* initialize stuff */
234 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
235 if (png_ptr == NULL) {
236 fprintf(stderr, "png_create_write_struct() failed");
240 info_ptr = png_create_info_struct(png_ptr);
241 if (info_ptr == NULL) {
242 fprintf(stderr, "png_create_info_struct() failed");
246 if (setjmp(png_jmpbuf(png_ptr)) != 0) {
247 fprintf(stderr, "error in png code\n");
251 png_init_io(png_ptr, f);
253 png_set_IHDR(png_ptr, info_ptr, w, h,
254 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
255 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
257 png_write_info(png_ptr, info_ptr);
258 png_write_image(png_ptr, row_pointers);
259 png_write_end(png_ptr, NULL);
264 // png_destroy_info_struct(png_ptr, &info_ptr); // freed below
266 png_destroy_write_struct(&png_ptr, &info_ptr);
268 for (i = 0; i < h; i++)
269 free(row_pointers[i]);