Changeset 2758 for libpipiTweet

Timestamp:

Aug 23, 2008, 3:07:35 PM (13 years ago)

Author:

Sam Hocevar

Message:

• Add pipi_dither_ediff(), a generic error diffusion dithering algorithm that uses an image as the error diffusion kernel.

Location:

libpipi/trunk/pipi

Files:

• Makefile.am (modified) (1 diff)
• context.c (modified) (1 diff)
• dither/ediff.c (added)
• pipi.h (modified) (1 diff)

libpipi/trunk/pipi/Makefile.am

@@ -65 +65 @@
 
 dither_sources = \
+        dither/ediff.c \
         dither/floydsteinberg.c \
         dither/jajuni.c \

libpipi/trunk/pipi/context.c

@@ -101 +101 @@
         else if(!strcmp(method, "sost"))
             dst = pipi_dither_ostromoukhov(src, 1);
+        else if(!strcmp(method, "ediff"))
+        {
+            if(ctx->nimages < 2)
+                return -1;
+            dst = pipi_dither_ediff(ctx->images[ctx->nimages - 2], src, 0);
+            pipi_free(ctx->images[ctx->nimages - 2]);
+            ctx->nimages--;
+        }
         else if(!strcmp(method, "ordered"))
         {

libpipi/trunk/pipi/pipi.h

@@ -148 +148 @@
 extern pipi_image_t *pipi_reduce(pipi_image_t *, int, double const *);
 
+extern pipi_image_t *pipi_dither_ediff(pipi_image_t *, pipi_image_t *,
+                                       pipi_scan_t);
 extern pipi_image_t *pipi_dither_floydsteinberg(pipi_image_t *, pipi_scan_t);
 extern pipi_image_t *pipi_dither_jajuni(pipi_image_t *, pipi_scan_t);