J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | #include "splashscreen_impl.h" |
| 27 | |
| 28 | #include "jinclude.h" |
| 29 | #include "jpeglib.h" |
| 30 | #include "jerror.h" |
| 31 | |
| 32 | #include <setjmp.h> |
| 33 | |
| 34 | /* stream input handling */ |
| 35 | |
| 36 | typedef struct |
| 37 | { |
| 38 | struct jpeg_source_mgr pub; /* public fields */ |
| 39 | SplashStream * stream; /* source stream */ |
| 40 | JOCTET *buffer; /* start of buffer */ |
| 41 | boolean start_of_file; /* have we gotten any data yet? */ |
| 42 | } stream_source_mgr; |
| 43 | |
| 44 | typedef stream_source_mgr *stream_src_ptr; |
| 45 | |
| 46 | #define INPUT_BUF_SIZE 4096 /* choose an efficiently fread'able size */ |
| 47 | |
| 48 | METHODDEF(void) |
| 49 | stream_init_source(j_decompress_ptr cinfo) |
| 50 | { |
| 51 | stream_src_ptr src = (stream_src_ptr) cinfo->src; |
| 52 | |
| 53 | src->start_of_file = TRUE; |
| 54 | } |
| 55 | |
| 56 | METHODDEF(boolean) |
| 57 | stream_fill_input_buffer(j_decompress_ptr cinfo) |
| 58 | { |
| 59 | stream_src_ptr src = (stream_src_ptr) cinfo->src; |
| 60 | size_t nbytes; |
| 61 | |
| 62 | |
| 63 | nbytes = src->stream->read(src->stream, src->buffer, INPUT_BUF_SIZE); |
| 64 | |
| 65 | if (nbytes <= 0) { |
| 66 | if (src->start_of_file) /* Treat empty input file as fatal error */ |
| 67 | ERREXIT(cinfo, JERR_INPUT_EMPTY); |
| 68 | WARNMS(cinfo, JWRN_JPEG_EOF); |
| 69 | /* Insert a fake EOI marker */ |
| 70 | src->buffer[0] = (JOCTET) 0xFF; |
| 71 | src->buffer[1] = (JOCTET) JPEG_EOI; |
| 72 | nbytes = 2; |
| 73 | } |
| 74 | |
| 75 | src->pub.next_input_byte = src->buffer; |
| 76 | src->pub.bytes_in_buffer = nbytes; |
| 77 | src->start_of_file = FALSE; |
| 78 | |
| 79 | return TRUE; |
| 80 | } |
| 81 | |
| 82 | METHODDEF(void) |
| 83 | stream_skip_input_data(j_decompress_ptr cinfo, long num_bytes) |
| 84 | { |
| 85 | stream_src_ptr src = (stream_src_ptr) cinfo->src; |
| 86 | |
| 87 | if (num_bytes > 0) { |
| 88 | while (num_bytes > (long) src->pub.bytes_in_buffer) { |
| 89 | num_bytes -= (long) src->pub.bytes_in_buffer; |
| 90 | (void) stream_fill_input_buffer(cinfo); |
| 91 | } |
| 92 | src->pub.next_input_byte += (size_t) num_bytes; |
| 93 | src->pub.bytes_in_buffer -= (size_t) num_bytes; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | METHODDEF(void) |
| 98 | stream_term_source(j_decompress_ptr cinfo) |
| 99 | { |
| 100 | } |
| 101 | |
| 102 | static void |
| 103 | set_stream_src(j_decompress_ptr cinfo, SplashStream * stream) |
| 104 | { |
| 105 | stream_src_ptr src; |
| 106 | |
| 107 | if (cinfo->src == NULL) { /* first time for this JPEG object? */ |
| 108 | cinfo->src = (struct jpeg_source_mgr *) |
| 109 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, |
| 110 | JPOOL_PERMANENT, SIZEOF(stream_source_mgr)); |
| 111 | src = (stream_src_ptr) cinfo->src; |
| 112 | src->buffer = (JOCTET *) |
| 113 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, |
| 114 | JPOOL_PERMANENT, INPUT_BUF_SIZE * SIZEOF(JOCTET)); |
| 115 | } |
| 116 | |
| 117 | src = (stream_src_ptr) cinfo->src; |
| 118 | src->pub.init_source = stream_init_source; |
| 119 | src->pub.fill_input_buffer = stream_fill_input_buffer; |
| 120 | src->pub.skip_input_data = stream_skip_input_data; |
| 121 | src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */ |
| 122 | src->pub.term_source = stream_term_source; |
| 123 | src->stream = stream; |
| 124 | src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */ |
| 125 | src->pub.next_input_byte = NULL; /* until buffer loaded */ |
| 126 | } |
| 127 | |
| 128 | int |
| 129 | SplashDecodeJpeg(Splash * splash, struct jpeg_decompress_struct *cinfo) |
| 130 | { |
| 131 | int rowStride, stride; |
| 132 | JSAMPARRAY buffer; |
| 133 | ImageFormat srcFormat; |
| 134 | |
| 135 | jpeg_read_header(cinfo, TRUE); |
| 136 | jpeg_start_decompress(cinfo); |
| 137 | |
| 138 | SplashCleanup(splash); |
| 139 | |
| 140 | splash->width = cinfo->output_width; |
| 141 | splash->height = cinfo->output_height; |
| 142 | stride = splash->width * splash->imageFormat.depthBytes; |
| 143 | |
| 144 | splash->frameCount = 1; |
| 145 | splash->frames = (SplashImage *) malloc(sizeof(SplashImage) * |
| 146 | splash->frameCount); |
| 147 | memset(splash->frames, 0, sizeof(SplashImage) * |
| 148 | splash->frameCount); |
| 149 | splash->loopCount = 1; |
| 150 | splash->frames[0].bitmapBits = malloc(stride * splash->height); |
| 151 | splash->frames[0].delay = 0; |
| 152 | |
| 153 | rowStride = cinfo->output_width * cinfo->output_components; |
| 154 | |
| 155 | buffer = (*cinfo->mem->alloc_sarray) |
| 156 | ((j_common_ptr) cinfo, JPOOL_IMAGE, rowStride, 1); |
| 157 | |
| 158 | initFormat(&srcFormat, 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000); |
| 159 | srcFormat.byteOrder = BYTE_ORDER_LSBFIRST; |
| 160 | srcFormat.depthBytes = 3; |
| 161 | srcFormat.fixedBits = 0xFF000000; |
| 162 | |
| 163 | splash->maskRequired = 0; // reset maskRequired as JPEG can't be transparent |
| 164 | |
| 165 | while (cinfo->output_scanline < cinfo->output_height) { |
| 166 | rgbquad_t *out = |
| 167 | (rgbquad_t *) ((byte_t *) splash->frames[0].bitmapBits + |
| 168 | cinfo->output_scanline * stride); |
| 169 | |
| 170 | jpeg_read_scanlines(cinfo, buffer, 1); |
| 171 | convertLine(buffer[0], sizeof(JSAMPLE) * 3, out, |
| 172 | splash->imageFormat.depthBytes, cinfo->output_width, &srcFormat, |
| 173 | &splash->imageFormat, CVT_COPY, NULL, 0, NULL, |
| 174 | cinfo->output_scanline, 0); |
| 175 | } |
| 176 | jpeg_finish_decompress(cinfo); |
| 177 | |
| 178 | return 1; |
| 179 | } |
| 180 | |
| 181 | struct my_error_mgr |
| 182 | { |
| 183 | struct jpeg_error_mgr pub; /* "public" fields */ |
| 184 | jmp_buf setjmp_buffer; /* for return to caller */ |
| 185 | }; |
| 186 | |
| 187 | typedef struct my_error_mgr *my_error_ptr; |
| 188 | |
| 189 | static void |
| 190 | my_error_exit(j_common_ptr cinfo) |
| 191 | { |
| 192 | /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */ |
| 193 | my_error_ptr myerr = (my_error_ptr) cinfo->err; |
| 194 | |
| 195 | /* Always display the message. */ |
| 196 | /* We could postpone this until after returning, if we chose. */ |
| 197 | (*cinfo->err->output_message) (cinfo); |
| 198 | |
| 199 | /* Return control to the setjmp point */ |
| 200 | longjmp(myerr->setjmp_buffer, 1); |
| 201 | } |
| 202 | |
| 203 | int |
| 204 | SplashDecodeJpegStream(Splash * splash, SplashStream * stream) |
| 205 | { |
| 206 | struct jpeg_decompress_struct cinfo; |
| 207 | int success = 0; |
| 208 | struct my_error_mgr jerr; |
| 209 | |
| 210 | cinfo.err = jpeg_std_error(&jerr.pub); |
| 211 | jerr.pub.error_exit = my_error_exit; |
| 212 | |
| 213 | if (setjmp(jerr.setjmp_buffer)) { |
| 214 | goto done; |
| 215 | } |
| 216 | jpeg_create_decompress(&cinfo); |
| 217 | set_stream_src(&cinfo, stream); |
| 218 | success = SplashDecodeJpeg(splash, &cinfo); |
| 219 | |
| 220 | done: |
| 221 | jpeg_destroy_decompress(&cinfo); |
| 222 | return success; |
| 223 | } |