From 830b576dd1ea76402fff0d188281ba39380605e5 Mon Sep 17 00:00:00 2001
From: Franz Marini <marini@pcmenelao.mi.infn.it>
Date: Tue, 28 Aug 2001 12:50:15 +0000
Subject: [PATCH] ok, just wrote this little function to do pixel drawing with
 blending. In fact, I wrote it just for the Bezier drawing function, but I
 thought it could be useful in other cases too. Have fun, Lightman :)

SVN revision: 5302
---
 src/Imlib2.h   |  1 +
 src/api.c      | 24 ++++++++++++++++++++++++
 src/rgbadraw.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/rgbadraw.h |  3 +++
 4 files changed, 76 insertions(+)

diff --git a/src/Imlib2.h b/src/Imlib2.h
index 634403c..9b51088 100644
--- a/src/Imlib2.h
+++ b/src/Imlib2.h
@@ -354,6 +354,7 @@ extern "C"
                                                 int height);
 
 /* drawing on images */
+   Imlib_Updates imlib_image_draw_pixel(int x, int y, char make_updates);
    Imlib_Updates imlib_image_draw_line(int x1, int y1, int x2, int y2,
                                        char make_updates);
    int imlib_clip_line(int x0, int y0, int x1, int y1, int xmin, int xmax,
diff --git a/src/api.c b/src/api.c
index 906bdfb..fbaf49c 100644
--- a/src/api.c
+++ b/src/api.c
@@ -3221,6 +3221,30 @@ imlib_apply_color_modifier_to_rectangle(int x, int y, int width, int height)
                          (ImlibColorModifier *) ctx->color_modifier);
 }
 
+Imlib_Updates
+imlib_image_draw_pixel(int x, int y, char make_updates)
+{
+   ImlibImage *im;
+
+   if (!ctx) ctx = imlib_context_new();
+   CHECK_PARAM_POINTER_RETURN("imlib_image_draw_pixel", "image", ctx->image,
+		              NULL);
+   CAST_IMAGE(im, ctx->image);
+   if ((!(im->data)) && (im->loader) && (im->loader->load))
+      im->loader->load(im, NULL, 0, 1);
+   if (!(im->data))
+      return NULL;
+   __imlib_DirtyImage(im);
+   __imlib_DirtyPixmapsForImage(im);
+   return (Imlib_Updates) __imlib_draw_pixel(im, x, y,
+                                             (DATA8) ctx->color.red,
+					     (DATA8) ctx->color.green,
+					     (DATA8) ctx->color.blue,
+					     (DATA8) ctx->color.alpha,
+					     ctx->operation,
+					     (char) make_updates);
+}  
+
 Imlib_Updates
 imlib_image_draw_line(int x1, int y1, int x2, int y2, char make_updates)
 {
diff --git a/src/rgbadraw.c b/src/rgbadraw.c
index e152698..e5f71c0 100644
--- a/src/rgbadraw.c
+++ b/src/rgbadraw.c
@@ -441,6 +441,54 @@ __imlib_TileImageVert(ImlibImage * im)
    im->data = data;
 }
 
+ImlibUpdate *
+__imlib_draw_pixel(ImlibImage *im, int x, int y, DATA8 r, DATA8 g, DATA8 b,
+		   DATA8 a, ImlibOp op, char make_updates)
+{
+   int tmp;
+   DATA32 *p;
+
+   /*clip to edges */
+   if ((x < 0) || (x >= im->w) || (y < 0) || (y >= im->h))
+      return NULL;
+
+   switch(op)
+   {
+     case OP_COPY:
+	p = &(im->data[im->w * y + x]);
+	BLEND(r, g, b, a, p);
+	if (!make_updates)
+	   return NULL;
+	return __imlib_AddUpdate(NULL, x, y, 1, 1);
+	break;
+     case OP_ADD:
+	p = &(im->data[im->w * y + x]);
+	BLEND_ADD(r, g, b, a, p);
+	if (!make_updates)
+	   return NULL;
+	return __imlib_AddUpdate(NULL, x, y, 1, 1);
+	break;
+     case OP_SUBTRACT:
+	p = &(im->data[im->w * y + x]);
+	BLEND_SUB(r, g, b, a, p);
+	if (!make_updates)
+	   return NULL;
+	return __imlib_AddUpdate(NULL, x, y, 1, 1);
+	break;
+     case OP_RESHADE:
+	p = &(im->data[im->w * y + x]);
+	BLEND_RE(r, g, b, a, p);
+	if (!make_updates)
+	   return NULL;
+	return __imlib_AddUpdate(NULL, x, y, 1, 1);
+	break;
+     default:
+	break;
+   }
+   return NULL;
+}
+
+
 ImlibUpdate *
 __imlib_draw_line(ImlibImage * im, int x1, int y1, int x2, int y2, DATA8 r,
                   DATA8 g, DATA8 b, DATA8 a, ImlibOp op, char make_updates)
diff --git a/src/rgbadraw.h b/src/rgbadraw.h
index 3d14c7b..1125231 100644
--- a/src/rgbadraw.h
+++ b/src/rgbadraw.h
@@ -136,6 +136,9 @@ void __imlib_BlurImage(ImlibImage * im, int rad);
 void __imlib_SharpenImage(ImlibImage * im, int rad);
 void __imlib_TileImageHoriz(ImlibImage * im);
 void __imlib_TileImageVert(ImlibImage * im);
+ImlibUpdate *__imlib_draw_pixel(ImlibImage *im, int x, int y, DATA8 r, 
+		                DATA8 g, DATA8 b, DATA8 a, ImlibOp op,
+				char make_updates);
 ImlibUpdate *__imlib_draw_line(ImlibImage * im, int x1, int y1, int x2,
                                int y2, DATA8 r, DATA8 g, DATA8 b, DATA8 a,
                                ImlibOp op, char make_updates);