new utility function which factors out massive code duplication from the

2005-12-14  Michael Natterer  <mitch@imendio.com>

	* gdk-pixbuf/io-jpeg.c (gdk_pixbuf__jpeg_image_load_lines): new
	utility function which factors out massive code duplication from
	the commit below.

1 files changed, 70 insertions, 108 deletions

diff --git a/gdk-pixbuf/io-jpeg.c b/gdk-pixbuf/io-jpeg.c
index 9c3c064f9..84376d51b 100644
--- a/gdk-pixbuf/io-jpeg.c
+++ b/gdk-pixbuf/io-jpeg.c
@@ -546,6 +546,65 @@ gdk_pixbuf__jpeg_image_stop_load (gpointer data, GError **error)
 }
 
 
+static gboolean
+gdk_pixbuf__jpeg_image_load_lines (JpegProgContext  *context,
+                                   GError          **error)
+{
+        struct jpeg_decompress_struct *cinfo = &context->cinfo;
+        guchar *lines[4];
+        guchar **lptr;
+        guchar *rowptr;
+        gint   nlines, i;
+
+        /* keep going until we've done all scanlines */
+        while (cinfo->output_scanline < cinfo->output_height) {
+                lptr = lines;
+                rowptr = context->dptr;
+                for (i=0; i < cinfo->rec_outbuf_height; i++) {
+                        *lptr++ = rowptr;
+                        rowptr += context->pixbuf->rowstride;
+                }
+
+                nlines = jpeg_read_scanlines (cinfo, lines,
+                                              cinfo->rec_outbuf_height);
+                if (nlines == 0)
+                        break;
+
+                switch (cinfo->out_color_space) {
+                case JCS_GRAYSCALE:
+                        explode_gray_into_buf (cinfo, lines);
+                        break;
+                case JCS_RGB:
+                        /* do nothing */
+                        break;
+                case JCS_CMYK:
+                        convert_cmyk_to_rgb (cinfo, lines);
+                        break;
+                default:
+                        if (error && *error == NULL) {
+                                g_set_error (error,
+                                             GDK_PIXBUF_ERROR,
+                                             GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
+                                             _("Unsupported JPEG color space (%s)"),
+                                             colorspace_name (cinfo->out_color_space));
+                        }
+
+                        return FALSE;
+                }
+
+                context->dptr += nlines * context->pixbuf->rowstride;
+
+                /* send updated signal */
+                (* context->updated_func) (context->pixbuf,
+                                           0,
+                                           cinfo->output_scanline - 1,
+                                           cinfo->image_width,
+                                           nlines,
+                                           context->user_data);
+        }
+
+        return TRUE;
+}
 
 
 /*
@@ -705,75 +764,18 @@ gdk_pixbuf__jpeg_image_load_increment (gpointer data,
 			context->did_prescan = TRUE;
 		} else if (!cinfo->buffered_image) {
                         /* we're decompressing unbuffered so
-                         * get scanline by scanline from jpeg lib
-                         *
-                         * except for handling multiple passes this is
-                         * virtually identical to the next branch
+                         * simply get scanline by scanline from jpeg lib
                          */
-			guchar *lines[4];
-			guchar **lptr;
-			guchar *rowptr;
-			gint   nlines, i;
-
-			/* keep going until we've done all scanlines */
-			while (cinfo->output_scanline < cinfo->output_height) {
-				lptr = lines;
-				rowptr = context->dptr;
-				for (i=0; i < cinfo->rec_outbuf_height; i++) {
-					*lptr++ = rowptr;
-					rowptr += context->pixbuf->rowstride;
-				}
-
-				nlines = jpeg_read_scanlines (cinfo, lines,
-							      cinfo->rec_outbuf_height);
-				if (nlines == 0)
-					break;
-
-				switch (cinfo->out_color_space) {
-				    case JCS_GRAYSCALE:
-					    explode_gray_into_buf (cinfo, lines);
-					    break;
-				    case JCS_RGB:
-					    /* do nothing */
-					    break;
-				    case JCS_CMYK:
-					    convert_cmyk_to_rgb (cinfo, lines);
-					    break;
-				    default:
-					    if (error && *error == NULL) {
-						    g_set_error (error,
-								 GDK_PIXBUF_ERROR,
-								 GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
-								 _("Unsupported JPEG color space (%s)"),
-								 colorspace_name (cinfo->out_color_space));
-					    }
-
-					    return FALSE;
-				}
-
-				context->dptr += nlines * context->pixbuf->rowstride;
-
-				/* send updated signal */
-				(* context->updated_func) (context->pixbuf,
-							   0,
-							   cinfo->output_scanline-1,
-							   cinfo->image_width,
-							   nlines,
-							   context->user_data);
-			}
+                        if (! gdk_pixbuf__jpeg_image_load_lines (context,
+                                                                 error))
+                                return FALSE;
 
 			if (cinfo->output_scanline >= cinfo->output_height)
 				return TRUE;
 		} else {
-                        /* we're decompressing so feed jpeg lib scanlines
-                         *
-                         * except for handling multiple passes this is
-                         * virtually identical to the previous branch
+                        /* we're decompressing buffered (progressive)
+                         * so feed jpeg lib scanlines
                          */
-			guchar *lines[4];
-			guchar **lptr;
-			guchar *rowptr;
-			gint   nlines, i;
 
 			/* keep going until we've done all passes */
 			while (!jpeg_input_complete (cinfo)) {
@@ -785,53 +787,13 @@ gdk_pixbuf__jpeg_image_load_increment (gpointer data,
 					else
 						break;
 				}
-				/* keep going until we've done all scanlines */
-				while (cinfo->output_scanline < cinfo->output_height) {
-					lptr = lines;
-					rowptr = context->dptr;
-					for (i=0; i < cinfo->rec_outbuf_height; i++) {
-						*lptr++ = rowptr;
-						rowptr += context->pixbuf->rowstride;
-					}
-					
-					nlines = jpeg_read_scanlines (cinfo, lines,
-								      cinfo->rec_outbuf_height);
-					if (nlines == 0)
-						break;
 
-					switch (cinfo->out_color_space) {
-					    case JCS_GRAYSCALE:
-						    explode_gray_into_buf (cinfo, lines);
-						    break;
-					    case JCS_RGB:
-						    /* do nothing */
-						    break;
-					    case JCS_CMYK:
-						    convert_cmyk_to_rgb (cinfo, lines);
-						    break;
-					    default:
-						    if (error && *error == NULL) {
-							    g_set_error (error,
-									 GDK_PIXBUF_ERROR,
-									 GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
-									 _("Unsupported JPEG color space (%s)"),
-									 colorspace_name (cinfo->out_color_space)); 
-						    }
-						    
-						    return FALSE;
-					}
+                                /* get scanlines from jpeg lib */
+                                if (! gdk_pixbuf__jpeg_image_load_lines (context,
+                                                                         error))
+                                        return FALSE;
 
-					context->dptr += nlines * context->pixbuf->rowstride;
-					
-				        /* send updated signal */
-					(* context->updated_func) (context->pixbuf,
-								   0, 
-								   cinfo->output_scanline-1,
-								   cinfo->image_width, 
-								   nlines,
-								   context->user_data);
-				}
-				if (cinfo->output_scanline >= cinfo->output_height && 
+				if (cinfo->output_scanline >= cinfo->output_height &&
 				    jpeg_finish_output (cinfo))
 					context->in_output = FALSE;
 				else