--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file mptr_jpeg.cpp
+** \brief ppm Target Module
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+** General Public License for more details.
+** \endlegal
+**
+** === N O T E S ===========================================================
+**
+** ========================================================================= */
+
+/*! \todo Support 16 bit JPEG files
+** \todo Support for paletted JPEG files
+** \todo Support GAMMA correction
+** \todo Fix memory leaks
+*/
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+# include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "mptr_jpeg.h"
+#include <synfig/importer.h>
+#include <synfig/time.h>
+#include <synfig/general.h>
+
+
+#include <cstdio>
+#include <algorithm>
+#include <functional>
+#endif
+
+/* === M A C R O S ========================================================= */
+
+using namespace synfig;
+using namespace std;
+using namespace etl;
+
+#define JPEG_CHECK_BYTES 8
+
+/* === G L O B A L S ======================================================= */
+
+SYNFIG_IMPORTER_INIT(jpeg_mptr);
+SYNFIG_IMPORTER_SET_NAME(jpeg_mptr,"jpeg");
+SYNFIG_IMPORTER_SET_EXT(jpeg_mptr,"jpg");
+SYNFIG_IMPORTER_SET_VERSION(jpeg_mptr,"0.1");
+SYNFIG_IMPORTER_SET_CVS_ID(jpeg_mptr,"$Id$");
+
+/* === M E T H O D S ======================================================= */
+
+struct my_error_mgr {
+ struct jpeg_error_mgr pub; /* "public" fields */
+
+ jmp_buf setjmp_buffer; /* for return to caller */
+};
+
+typedef struct my_error_mgr * my_error_ptr;
+
+/*
+ * Here's the routine that will replace the standard error_exit method:
+ */
+
+void
+jpeg_mptr::my_error_exit (j_common_ptr cinfo)
+{
+ /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
+ my_error_ptr myerr = (my_error_ptr) cinfo->err;
+
+ /* Always display the message. */
+ /* We could postpone this until after returning, if we chose. */
+ (*cinfo->err->output_message) (cinfo);
+
+ /* Return control to the setjmp point */
+ longjmp(myerr->setjmp_buffer, 1);
+}
+
+
+
+
+
+jpeg_mptr::jpeg_mptr(const char *file_name)
+{
+ struct my_error_mgr jerr;
+ filename=file_name;
+
+ /* Open the file pointer */
+ FILE *file = fopen(file_name, "rb");
+ if (!file)
+ {
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*1");
+ return;
+ }
+
+ /* Step 1: allocate and initialize JPEG decompression object */
+
+ /* We set up the normal JPEG error routines, then override error_exit. */
+ cinfo.err = jpeg_std_error(&jerr.pub);
+ jerr.pub.error_exit = my_error_exit;
+ /* Establish the setjmp return context for my_error_exit to use. */
+ if (setjmp(jerr.setjmp_buffer)) {
+ /* If we get here, the JPEG code has signaled an error.
+ * We need to clean up the JPEG object, close the input file, and return.
+ */
+ jpeg_destroy_decompress(&cinfo);
+ fclose(file);
+ throw String("error on importer construction, *WRITEME*2");
+ }
+ /* Now we can initialize the JPEG decompression object. */
+ jpeg_create_decompress(&cinfo);
+
+ /* Step 2: specify data source (eg, a file) */
+
+ jpeg_stdio_src(&cinfo, file);
+
+ /* Step 3: read file parameters with jpeg_read_header() */
+
+ (void) jpeg_read_header(&cinfo, TRUE);
+ /* We can ignore the return value from jpeg_read_header since
+ * (a) suspension is not possible with the stdio data source, and
+ * (b) we passed TRUE to reject a tables-only JPEG file as an error.
+ * See libjpeg.doc for more info.
+ */
+
+ /* Step 4: set parameters for decompression */
+
+ /* In this example, we don't need to change any of the defaults set by
+ * jpeg_read_header(), so we do nothing here.
+ */
+
+ /* Step 5: Start decompressor */
+
+ (void) jpeg_start_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ JSAMPARRAY buffer; /* Output row buffer */
+ int row_stride; /* physical row width in output buffer */
+ row_stride = cinfo.output_width * cinfo.output_components;
+ /* Make a one-row-high sample array that will go away when done with image */
+ buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+
+ if(!buffer)
+ {
+ synfig::error("jpeg_mptr: error: alloc of \"buffer\" failed (bug?)");
+ throw String("alloc of \"buffer\" failed (bug?)");
+ }
+
+ int x;
+ int y;
+ surface_buffer.set_wh(cinfo.output_width,cinfo.output_height);
+
+ switch(cinfo.output_components)
+ {
+ case 3:
+ for(y=0;y<surface_buffer.get_h();y++)
+ {
+ int x;
+ jpeg_read_scanlines(&cinfo, buffer, 1);
+ for(x=0;x<surface_buffer.get_w();x++)
+ {
+ float r=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+0]);
+ float g=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+1]);
+ float b=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+2]);
+ surface_buffer[y][x]=Color(
+ r,
+ g,
+ b,
+ 1.0
+ );
+/*
+ surface_buffer[y][x]=Color(
+ (float)(unsigned char)buffer[0][x*3+0]*(1.0/255.0),
+ (float)(unsigned char)buffer[0][x*3+1]*(1.0/255.0),
+ (float)(unsigned char)buffer[0][x*3+2]*(1.0/255.0),
+ 1.0
+ );
+*/
+ }
+ }
+ break;
+
+ case 1:
+ for(y=0;y<surface_buffer.get_h();y++)
+ {
+ jpeg_read_scanlines(&cinfo, buffer, 1);
+ for(x=0;x<surface_buffer.get_w();x++)
+ {
+ float gray=gamma().g_U8_to_F32((unsigned char)buffer[0][x]);
+// float gray=(float)(unsigned char)buffer[0][x]*(1.0/255.0);
+ surface_buffer[y][x]=Color(
+ gray,
+ gray,
+ gray,
+ 1.0
+ );
+ }
+ }
+ break;
+
+ default:
+ synfig::error("jpeg_mptr: error: Unsupported color type");
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*6");
+ return;
+ }
+
+ /* Step 7: Finish decompression */
+
+ (void) jpeg_finish_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* Step 8: Release JPEG decompression object */
+
+ /* This is an important step since it will release a good deal of memory. */
+ jpeg_destroy_decompress(&cinfo);
+
+ /* After finish_decompress, we can close the input file.
+ * Here we postpone it until after no more JPEG errors are possible,
+ * so as to simplify the setjmp error logic above. (Actually, I don't
+ * think that jpeg_destroy can do an error exit, but why assume anything...)
+ */
+ fclose(file);
+}
+
+jpeg_mptr::~jpeg_mptr()
+{
+}
+
+bool
+jpeg_mptr::get_frame(synfig::Surface &surface,Time, synfig::ProgressCallback */*cb*/)
+{
+ surface=surface_buffer;
+ return true;
+}
projects / synfig.git / blobdiff