1 /**************************************************************************
3 * Copyright 2008-2010 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
57 uint32_t biCompression;
59 int32_t biXPelsPerMeter;
60 int32_t biYPelsPerMeter;
62 uint32_t biClrImportant;
74 Image::writeBMP(const char *filename) const {
75 struct FileHeader bmfh;
76 struct InfoHeader bmih;
80 bmfh.bfSize = 14 + 40 + height*width*4;
83 bmfh.bfOffBits = 14 + 40;
87 bmih.biHeight = height;
90 bmih.biCompression = 0;
91 bmih.biSizeImage = height*width*4;
92 bmih.biXPelsPerMeter = 0;
93 bmih.biYPelsPerMeter = 0;
95 bmih.biClrImportant = 0;
97 std::ofstream stream(filename, std::ofstream::binary);
102 stream.write((const char *)&bmfh, 14);
103 stream.write((const char *)&bmih, 40);
105 unsigned stride = width*4;
108 for (y = 0; y < height; ++y) {
109 const unsigned char *ptr = pixels + y * stride;
110 for (x = 0; x < width; ++x) {
112 pixel.rgbRed = ptr[x*4 + 0];
113 pixel.rgbGreen = ptr[x*4 + 1];
114 pixel.rgbBlue = ptr[x*4 + 2];
115 pixel.rgbAlpha = ptr[x*4 + 3];
116 stream.write((const char *)&pixel, 4);
122 const unsigned char *ptr = pixels + y * stride;
123 for (x = 0; x < width; ++x) {
125 pixel.rgbRed = ptr[x*4 + 0];
126 pixel.rgbGreen = ptr[x*4 + 1];
127 pixel.rgbBlue = ptr[x*4 + 2];
128 pixel.rgbAlpha = ptr[x*4 + 3];
129 stream.write((const char *)&pixel, 4);
140 Image::writePNG(const char *filename) const {
145 fp = fopen(filename, "wb");
149 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
153 info_ptr = png_create_info_struct(png_ptr);
155 png_destroy_write_struct(&png_ptr, NULL);
159 if (setjmp(png_jmpbuf(png_ptr))) {
160 png_destroy_write_struct(&png_ptr, &info_ptr);
164 png_init_io(png_ptr, fp);
166 png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
167 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
169 png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
171 png_write_info(png_ptr, info_ptr);
174 for (unsigned y = 0; y < height; ++y) {
175 png_bytep row = (png_bytep)(pixels + y*width*4);
176 png_write_rows(png_ptr, &row, 1);
181 png_bytep row = (png_bytep)(pixels + y*width*4);
182 png_write_rows(png_ptr, &row, 1);
186 png_write_end(png_ptr, info_ptr);
187 png_destroy_write_struct(&png_ptr, &info_ptr);
200 readPNG(const char *filename)
208 fp = fopen(filename, "rb");
212 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
216 info_ptr = png_create_info_struct(png_ptr);
218 png_destroy_read_struct(&png_ptr, NULL, NULL);
222 end_info = png_create_info_struct(png_ptr);
224 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
228 if (setjmp(png_jmpbuf(png_ptr))) {
229 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
233 png_init_io(png_ptr, fp);
235 png_read_info(png_ptr, info_ptr);
237 png_uint_32 width, height;
238 int bit_depth, color_type, interlace_type, compression_type, filter_method;
240 png_get_IHDR(png_ptr, info_ptr,
242 &bit_depth, &color_type, &interlace_type,
243 &compression_type, &filter_method);
245 image = new Image(width, height);
249 /* Convert to RGBA8 */
250 if (color_type == PNG_COLOR_TYPE_PALETTE)
251 png_set_palette_to_rgb(png_ptr);
252 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
253 png_set_expand_gray_1_2_4_to_8(png_ptr);
254 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
255 png_set_tRNS_to_alpha(png_ptr);
257 png_set_strip_16(png_ptr);
259 for (unsigned y = 0; y < height; ++y) {
260 png_bytep row = (png_bytep)(image->pixels + y*width*4);
261 png_read_row(png_ptr, row, NULL);
264 png_read_end(png_ptr, info_ptr);
265 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
270 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
278 double Image::compare(Image &ref)
280 if (width != ref.width ||
281 height != ref.height) {
285 const unsigned char *pSrc = start();
286 const unsigned char *pRef = ref.start();
288 unsigned long long error = 0;
289 for (unsigned y = 0; y < height; ++y) {
290 for (unsigned x = 0; x < width; ++x) {
291 // FIXME: Ignore alpha channel until we are able to pick a visual
292 // that matches the traces
293 for (unsigned c = 0; c < 3; ++c) {
294 int delta = pSrc[x*4 + c] - pRef[x*4 + c];
295 error += delta*delta;
300 pRef += ref.stride();
303 double numerator = error*2 + 1;
304 double denominator = height*width*3ULL*255ULL*255ULL*2;
305 double quotient = numerator/denominator;
308 double precision = -log(quotient)/log(2.0);
313 struct png_tmp_buffer
320 pngWriteCallback(png_structp png_ptr, png_bytep data, png_size_t length)
322 struct png_tmp_buffer *buf = (struct png_tmp_buffer*) png_ptr->io_ptr;
323 size_t nsize = buf->size + length;
325 /* allocate or grow buffer */
327 buf->buffer = (char*)realloc(buf->buffer, nsize);
329 buf->buffer = (char*)malloc(nsize);
332 png_error(png_ptr, "Buffer allocation error");
334 memcpy(buf->buffer + buf->size, data, length);
338 bool writePixelsToBuffer(unsigned char *pixels,
339 unsigned width, unsigned height, unsigned numChannels,
344 struct png_tmp_buffer png_mem;
349 png_mem.buffer = NULL;
352 switch (numChannels) {
354 type = PNG_COLOR_TYPE_RGB_ALPHA;
357 type = PNG_COLOR_TYPE_RGB;
360 type = PNG_COLOR_TYPE_GRAY_ALPHA;
363 type = PNG_COLOR_TYPE_GRAY;
369 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
373 info_ptr = png_create_info_struct(png_ptr);
375 png_destroy_write_struct(&png_ptr, NULL);
379 if (setjmp(png_jmpbuf(png_ptr))) {
380 png_destroy_write_struct(&png_ptr, &info_ptr);
384 png_set_write_fn(png_ptr, &png_mem, pngWriteCallback, NULL);
386 png_set_IHDR(png_ptr, info_ptr, width, height, 8,
387 type, PNG_INTERLACE_NONE,
388 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
390 png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
392 png_write_info(png_ptr, info_ptr);
395 for (unsigned y = 0; y < height; ++y) {
396 png_bytep row = (png_bytep)(pixels + y*width*numChannels);
397 png_write_rows(png_ptr, &row, 1);
402 png_bytep row = (png_bytep)(pixels + y*width*numChannels);
403 png_write_rows(png_ptr, &row, 1);
407 png_write_end(png_ptr, info_ptr);
408 png_destroy_write_struct(&png_ptr, &info_ptr);
410 *buffer = png_mem.buffer;
411 *size = png_mem.size;
420 free(png_mem.buffer);
424 } /* namespace Image */