1 /* === S Y N F I G ========================================================= */
2 /*! \file mptr_jpeg.cpp
3 ** \brief ppm Target Module
8 ** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
10 ** This package is free software; you can redistribute it and/or
11 ** modify it under the terms of the GNU General Public License as
12 ** published by the Free Software Foundation; either version 2 of
13 ** the License, or (at your option) any later version.
15 ** This package is distributed in the hope that it will be useful,
16 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ** General Public License for more details.
21 ** === N O T E S ===========================================================
23 ** ========================================================================= */
25 /*! \todo Support 16 bit JPEG files
26 ** \todo Support for paletted JPEG files
27 ** \todo Support GAMMA correction
28 ** \todo Fix memory leaks
31 /* === H E A D E R S ======================================================= */
40 #include "mptr_jpeg.h"
41 #include <synfig/importer.h>
42 #include <synfig/time.h>
43 #include <synfig/general.h>
51 /* === M A C R O S ========================================================= */
53 using namespace synfig;
57 #define JPEG_CHECK_BYTES 8
59 /* === G L O B A L S ======================================================= */
61 SYNFIG_IMPORTER_INIT(jpeg_mptr);
62 SYNFIG_IMPORTER_SET_NAME(jpeg_mptr,"jpeg");
63 SYNFIG_IMPORTER_SET_EXT(jpeg_mptr,"jpg");
64 SYNFIG_IMPORTER_SET_VERSION(jpeg_mptr,"0.1");
65 SYNFIG_IMPORTER_SET_CVS_ID(jpeg_mptr,"$Id$");
67 /* === M E T H O D S ======================================================= */
70 struct jpeg_error_mgr pub; /* "public" fields */
72 jmp_buf setjmp_buffer; /* for return to caller */
75 typedef struct my_error_mgr * my_error_ptr;
78 * Here's the routine that will replace the standard error_exit method:
82 jpeg_mptr::my_error_exit (j_common_ptr cinfo)
84 /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
85 my_error_ptr myerr = (my_error_ptr) cinfo->err;
87 /* Always display the message. */
88 /* We could postpone this until after returning, if we chose. */
89 (*cinfo->err->output_message) (cinfo);
91 /* Return control to the setjmp point */
92 longjmp(myerr->setjmp_buffer, 1);
99 jpeg_mptr::jpeg_mptr(const char *file_name)
101 struct my_error_mgr jerr;
104 /* Open the file pointer */
105 FILE *file = fopen(file_name, "rb");
108 //! \todo THROW SOMETHING
109 throw String("error on importer construction, *WRITEME*1");
113 /* Step 1: allocate and initialize JPEG decompression object */
115 /* We set up the normal JPEG error routines, then override error_exit. */
116 cinfo.err = jpeg_std_error(&jerr.pub);
117 jerr.pub.error_exit = my_error_exit;
118 /* Establish the setjmp return context for my_error_exit to use. */
119 if (setjmp(jerr.setjmp_buffer)) {
120 /* If we get here, the JPEG code has signaled an error.
121 * We need to clean up the JPEG object, close the input file, and return.
123 jpeg_destroy_decompress(&cinfo);
125 throw String("error on importer construction, *WRITEME*2");
127 /* Now we can initialize the JPEG decompression object. */
128 jpeg_create_decompress(&cinfo);
130 /* Step 2: specify data source (eg, a file) */
132 jpeg_stdio_src(&cinfo, file);
134 /* Step 3: read file parameters with jpeg_read_header() */
136 (void) jpeg_read_header(&cinfo, TRUE);
137 /* We can ignore the return value from jpeg_read_header since
138 * (a) suspension is not possible with the stdio data source, and
139 * (b) we passed TRUE to reject a tables-only JPEG file as an error.
140 * See libjpeg.doc for more info.
143 /* Step 4: set parameters for decompression */
145 /* In this example, we don't need to change any of the defaults set by
146 * jpeg_read_header(), so we do nothing here.
149 /* Step 5: Start decompressor */
151 (void) jpeg_start_decompress(&cinfo);
152 /* We can ignore the return value since suspension is not possible
153 * with the stdio data source.
156 JSAMPARRAY buffer; /* Output row buffer */
157 int row_stride; /* physical row width in output buffer */
158 row_stride = cinfo.output_width * cinfo.output_components;
159 /* Make a one-row-high sample array that will go away when done with image */
160 buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
164 synfig::error("jpeg_mptr: error: alloc of \"buffer\" failed (bug?)");
165 throw String("alloc of \"buffer\" failed (bug?)");
170 surface_buffer.set_wh(cinfo.output_width,cinfo.output_height);
172 switch(cinfo.output_components)
175 for(y=0;y<surface_buffer.get_h();y++)
178 jpeg_read_scanlines(&cinfo, buffer, 1);
179 for(x=0;x<surface_buffer.get_w();x++)
181 float r=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+0]);
182 float g=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+1]);
183 float b=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+2]);
184 surface_buffer[y][x]=Color(
191 surface_buffer[y][x]=Color(
192 (float)(unsigned char)buffer[0][x*3+0]*(1.0/255.0),
193 (float)(unsigned char)buffer[0][x*3+1]*(1.0/255.0),
194 (float)(unsigned char)buffer[0][x*3+2]*(1.0/255.0),
203 for(y=0;y<surface_buffer.get_h();y++)
205 jpeg_read_scanlines(&cinfo, buffer, 1);
206 for(x=0;x<surface_buffer.get_w();x++)
208 float gray=gamma().g_U8_to_F32((unsigned char)buffer[0][x]);
209 // float gray=(float)(unsigned char)buffer[0][x]*(1.0/255.0);
210 surface_buffer[y][x]=Color(
221 synfig::error("jpeg_mptr: error: Unsupported color type");
222 //! \todo THROW SOMETHING
223 throw String("error on importer construction, *WRITEME*6");
227 /* Step 7: Finish decompression */
229 (void) jpeg_finish_decompress(&cinfo);
230 /* We can ignore the return value since suspension is not possible
231 * with the stdio data source.
234 /* Step 8: Release JPEG decompression object */
236 /* This is an important step since it will release a good deal of memory. */
237 jpeg_destroy_decompress(&cinfo);
239 /* After finish_decompress, we can close the input file.
240 * Here we postpone it until after no more JPEG errors are possible,
241 * so as to simplify the setjmp error logic above. (Actually, I don't
242 * think that jpeg_destroy can do an error exit, but why assume anything...)
247 jpeg_mptr::~jpeg_mptr()
252 jpeg_mptr::get_frame(synfig::Surface &surface,Time, synfig::ProgressCallback */*cb*/)
254 surface.mirror(surface_buffer);