Initial import of sane-backends version 1.0.24-1.2

1 files changed, 235 insertions, 0 deletions

diff --git a/sanei/sanei_jpeg.c b/sanei/sanei_jpeg.c
new file mode 100644
index 0000000..7b66dae
--- /dev/null
+++ b/sanei/sanei_jpeg.c
@@ -0,0 +1,235 @@
+/*
+   Code for JPEG decompression by the Independent JPEG Group.  Please see
+   README.jpeg in the top level directory.
+ */
+
+#include "../include/sane/config.h"
+
+#ifdef HAVE_LIBJPEG
+
+#include "../include/sane/sanei_jpeg.h"
+
+typedef struct
+  {
+    struct djpeg_dest_struct pub;	/* public fields */
+
+    /* Usually these two pointers point to the same place: */
+    char *iobuffer;		/* fwrite's I/O buffer */
+    JSAMPROW pixrow;		/* decompressor output buffer */
+    size_t buffer_width;	/* width of I/O buffer */
+    JDIMENSION samples_per_row;	/* JSAMPLEs per output row */
+  }
+ppm_dest_struct;
+
+typedef ppm_dest_struct *ppm_dest_ptr;
+
+/*
+ * For 12-bit JPEG data, we either downscale the values to 8 bits
+ * (to write standard byte-per-sample PPM/PGM files), or output
+ * nonstandard word-per-sample PPM/PGM files.  Downscaling is done
+ * if PPM_NORAWWORD is defined (this can be done in the Makefile
+ * or in jconfig.h).
+ * (When the core library supports data precision reduction, a cleaner
+ * implementation will be to ask for that instead.)
+ */
+
+#if BITS_IN_JSAMPLE==8
+#define PUTPPMSAMPLE(ptr,v)  *ptr++=(char) (v)
+#define BYTESPERSAMPLE 1
+#define PPM_MAXVAL 255
+#else
+#ifdef PPM_NORAWWORD
+#define PUTPPMSAMPLE(ptr,v)  *ptr++=(char) ((v) >> (BITS_IN_JSAMPLE-8))
+#define BYTESPERSAMPLE 1
+#define PPM_MAXVAL 255
+#else
+/* The word-per-sample format always puts the LSB first. */
+#define PUTPPMSAMPLE(ptr,v)			\
+	{ register int val_=v;		\
+		*ptr++=(char) (val_ & 0xFF);	\
+		*ptr++=(char) ((val_ >> 8) & 0xFF);	\
+	}
+#define BYTESPERSAMPLE 2
+#define PPM_MAXVAL ((1<<BITS_IN_JSAMPLE)-1)
+#endif
+#endif
+
+METHODDEF (void)
+sanei_jpeg_start_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
+{
+  cinfo = cinfo;
+  dinfo = dinfo;
+  /* header image is supplied for us */
+
+}
+
+METHODDEF (void)
+sanei_jpeg_finish_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
+{
+  cinfo = cinfo;
+  dinfo = dinfo;
+
+  /* nothing to do */
+}
+
+/*
+ * Write some pixel data.
+ * In this module rows_supplied will always be 1.
+ *
+ * put_pixel_rows handles the "normal" 8-bit case where the decompressor
+ * output buffer is physically the same as the fwrite buffer.
+ */
+
+METHODDEF (void)
+sanei_jpeg_put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
+			   JDIMENSION rows_supplied, char *data)
+{
+  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
+  cinfo = cinfo;
+  dinfo = dinfo;
+  rows_supplied = rows_supplied;
+
+  memcpy (data, dest->iobuffer, dest->buffer_width);
+}
+
+
+/*
+ * This code is used when we have to copy the data and apply a pixel
+ * format translation.  Typically this only happens in 12-bit mode.
+ */
+
+METHODDEF (void)
+sanei_jpeg_copy_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
+			    JDIMENSION rows_supplied, char *data)
+{
+  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
+  register char *bufferptr;
+  register JSAMPROW ptr;
+  register JDIMENSION col;
+
+  cinfo = cinfo;
+  dinfo = dinfo;
+  rows_supplied = rows_supplied;
+
+  ptr = dest->pub.buffer[0];
+  bufferptr = dest->iobuffer;
+  for (col = dest->samples_per_row; col > 0; col--)
+    {
+      PUTPPMSAMPLE (bufferptr, GETJSAMPLE (*ptr++));
+    }
+  memcpy (data, dest->iobuffer, dest->buffer_width);
+}
+
+
+/*
+ * Write some pixel data when color quantization is in effect.
+ * We have to demap the color index values to straight data.
+ */
+
+METHODDEF (void)
+sanei_jpeg_put_demapped_rgb (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
+			     JDIMENSION rows_supplied, char *data)
+{
+
+  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
+  register char *bufferptr;
+  register int pixval;
+  register JSAMPROW ptr;
+  register JSAMPROW color_map0 = cinfo->colormap[0];
+  register JSAMPROW color_map1 = cinfo->colormap[1];
+  register JSAMPROW color_map2 = cinfo->colormap[2];
+  register JDIMENSION col;
+
+  rows_supplied = rows_supplied;
+
+  ptr = dest->pub.buffer[0];
+  bufferptr = dest->iobuffer;
+  for (col = cinfo->output_width; col > 0; col--)
+    {
+      pixval = GETJSAMPLE (*ptr++);
+      PUTPPMSAMPLE (bufferptr, GETJSAMPLE (color_map0[pixval]));
+      PUTPPMSAMPLE (bufferptr, GETJSAMPLE (color_map1[pixval]));
+      PUTPPMSAMPLE (bufferptr, GETJSAMPLE (color_map2[pixval]));
+    }
+  memcpy (data, dest->iobuffer, dest->buffer_width);
+}
+
+
+METHODDEF (void)
+sanei_jpeg_put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
+			      JDIMENSION rows_supplied, char *data)
+{
+  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
+  register char *bufferptr;
+  register JSAMPROW ptr;
+  register JSAMPROW color_map = cinfo->colormap[0];
+  register JDIMENSION col;
+
+  rows_supplied = rows_supplied;
+
+  ptr = dest->pub.buffer[0];
+  bufferptr = dest->iobuffer;
+  for (col = cinfo->output_width; col > 0; col--)
+    {
+      PUTPPMSAMPLE (bufferptr,
+		    GETJSAMPLE (color_map[GETJSAMPLE (*ptr++)]));
+    }
+  memcpy (data, dest->iobuffer, dest->buffer_width);
+}
+
+GLOBAL (djpeg_dest_ptr)
+sanei_jpeg_jinit_write_ppm (j_decompress_ptr cinfo)
+{
+
+  ppm_dest_ptr dest;
+
+  /* Create module interface object, fill in method pointers */
+  dest = (ppm_dest_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF (ppm_dest_struct));
+  dest->pub.start_output = sanei_jpeg_start_output_ppm;
+  dest->pub.finish_output = sanei_jpeg_finish_output_ppm;
+
+  /* Calculate output image dimensions so we can allocate space */
+  jpeg_calc_output_dimensions (cinfo);
+
+  /* Create physical I/O buffer.  Note we make this near on a PC. */
+  dest->samples_per_row = cinfo->output_width * cinfo->out_color_components;
+  dest->buffer_width = dest->samples_per_row * (BYTESPERSAMPLE * SIZEOF (char));
+  dest->iobuffer = (char *) (*cinfo->mem->alloc_small)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width);
+
+  if (cinfo->quantize_colors || BITS_IN_JSAMPLE != 8 ||
+      SIZEOF (JSAMPLE) != SIZEOF (char))
+    {
+      /* When quantizing, we need an output buffer for clrmap indexes
+       * that's separate from the physical I/O buffer.  We also need a
+       * separate buffer if pixel format translation must take place.
+       */
+      dest->pub.buffer = (*cinfo->mem->alloc_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE,
+	 cinfo->output_width * cinfo->output_components,
+	 (JDIMENSION) 1);
+      dest->pub.buffer_height = 1;
+      if (!cinfo->quantize_colors)
+	dest->pub.put_pixel_rows = sanei_jpeg_copy_pixel_rows;
+      else if (cinfo->out_color_space == JCS_GRAYSCALE)
+	dest->pub.put_pixel_rows = sanei_jpeg_put_demapped_gray;
+      else
+	dest->pub.put_pixel_rows = sanei_jpeg_put_demapped_rgb;
+    }
+  else
+    {
+      /* We will fwrite() directly from decompressor output buffer. */
+      /* Synthesize a JSAMPARRAY pointer structure */
+      /* Cast here implies near->far pointer conversion on PCs */
+      dest->pixrow = (JSAMPROW) dest->iobuffer;
+      dest->pub.buffer = &dest->pixrow;
+      dest->pub.buffer_height = 1;
+      dest->pub.put_pixel_rows = sanei_jpeg_put_pixel_rows;
+    }
+
+  return (djpeg_dest_ptr) dest;
+}
+
+#endif