1 /* 2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include "splashscreen_impl.h" 27 28 #include <png.h> 29 30 #include <setjmp.h> 31 32 #define SIG_BYTES 8 33 34 void PNGAPI 35 my_png_read_stream(png_structp png_ptr, png_bytep data, png_size_t length) 36 { 37 png_uint_32 check; 38 39 SplashStream * stream = (SplashStream*)png_get_io_ptr(png_ptr); 40 check = stream->read(stream, data, length); 41 if (check != length) 42 png_error(png_ptr, "Read Error"); 43 } 44 45 int 46 SplashDecodePng(Splash * splash, png_rw_ptr read_func, void *io_ptr) 47 { 48 int stride; 49 ImageFormat srcFormat; 50 png_uint_32 i, rowbytes; 51 png_bytepp row_pointers = NULL; 52 png_bytep image_data = NULL; 53 int success = 0; 54 double gamma; 55 56 png_structp png_ptr = NULL; 57 png_infop info_ptr = NULL; 58 59 png_uint_32 width, height; 60 int bit_depth, color_type; 61 62 ImageRect srcRect, dstRect; 63 64 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); 65 if (!png_ptr) { 66 goto done; 67 } 68 69 info_ptr = png_create_info_struct(png_ptr); 70 if (!info_ptr) { 71 goto done; 72 } 73 74 #ifdef __APPLE__ 75 /* use setjmp/longjmp versions that do not save/restore the signal mask */ 76 if (_setjmp(png_set_longjmp_fn(png_ptr, _longjmp, sizeof(jmp_buf)))) { 77 #else 78 if (setjmp(png_jmpbuf(png_ptr))) { 79 #endif 80 goto done; 81 } 82 83 png_set_read_fn(png_ptr, io_ptr, read_func); 84 85 png_set_sig_bytes(png_ptr, SIG_BYTES); /* we already read the 8 signature bytes */ 86 87 png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */ 88 89 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 90 NULL, NULL, NULL); 91 92 /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits, 93 * transparency chunks to full alpha channel; strip 16-bit-per-sample 94 * images to 8 bits per sample; and convert grayscale to RGB[A] 95 * this may be sub-optimal but this simplifies implementation */ 96 97 png_set_expand(png_ptr); 98 png_set_tRNS_to_alpha(png_ptr); 99 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER); 100 png_set_strip_16(png_ptr); 101 png_set_gray_to_rgb(png_ptr); 102 103 if (png_get_gAMA(png_ptr, info_ptr, &gamma)) 104 png_set_gamma(png_ptr, 2.2, gamma); 105 106 png_read_update_info(png_ptr, info_ptr); 107 108 rowbytes = png_get_rowbytes(png_ptr, info_ptr); 109 110 if (!SAFE_TO_ALLOC(rowbytes, height)) { 111 goto done; 112 } 113 114 if ((image_data = (unsigned char *) malloc(rowbytes * height)) == NULL) { 115 goto done; 116 } 117 118 if (!SAFE_TO_ALLOC(height, sizeof(png_bytep))) { 119 goto done; 120 } 121 if ((row_pointers = (png_bytepp) malloc(height * sizeof(png_bytep))) 122 == NULL) { 123 goto done; 124 } 125 126 for (i = 0; i < height; ++i) 127 row_pointers[i] = image_data + i * rowbytes; 128 129 png_read_image(png_ptr, row_pointers); 130 131 SplashCleanup(splash); 132 133 splash->width = width; 134 splash->height = height; 135 136 if (!SAFE_TO_ALLOC(splash->width, splash->imageFormat.depthBytes)) { 137 goto done; 138 } 139 stride = splash->width * splash->imageFormat.depthBytes; 140 141 if (!SAFE_TO_ALLOC(splash->height, stride)) { 142 goto done; 143 } 144 splash->frameCount = 1; 145 splash->frames = (SplashImage *) 146 malloc(sizeof(SplashImage) * splash->frameCount); 147 148 if (splash->frames == NULL) { 149 goto done; 150 } 151 152 splash->loopCount = 1; 153 splash->frames[0].bitmapBits = malloc(stride * splash->height); 154 if (splash->frames[0].bitmapBits == NULL) { 155 free(splash->frames); 156 goto done; 157 } 158 splash->frames[0].delay = 0; 159 160 /* FIXME: sort out the real format */ 161 initFormat(&srcFormat, 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF); 162 srcFormat.byteOrder = BYTE_ORDER_MSBFIRST; 163 164 initRect(&srcRect, 0, 0, width, height, 1, rowbytes, 165 image_data, &srcFormat); 166 initRect(&dstRect, 0, 0, width, height, 1, stride, 167 splash->frames[0].bitmapBits, &splash->imageFormat); 168 convertRect(&srcRect, &dstRect, CVT_COPY); 169 170 SplashInitFrameShape(splash, 0); 171 172 png_read_end(png_ptr, NULL); 173 success = 1; 174 175 done: 176 free(row_pointers); 177 free(image_data); 178 png_destroy_read_struct(&png_ptr, &info_ptr, NULL); 179 return success; 180 } 181 182 int 183 SplashDecodePngStream(Splash * splash, SplashStream * stream) 184 { 185 unsigned char sig[SIG_BYTES]; 186 int success = 0; 187 188 stream->read(stream, sig, SIG_BYTES); 189 if (png_sig_cmp(sig, 0, SIG_BYTES)) { 190 goto done; 191 } 192 success = SplashDecodePng(splash, my_png_read_stream, stream); 193 194 done: 195 return success; 196 }