cairo image drawing corrections.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@24301 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,12 @@
+2006-12-31 Fred Kiefer <FredKiefer@gmx.de>
+	
+	* Source/cairo/CairoGState.m (-setOffset:, -DPSinitmatrix): Use
+	cairo functions to handle offset.
+	* Source/cairo/CairoGState.m (-GSCurrentCTM): Changed order of
+	transformations. 
+	* Source/cairo/CairoGState.m (-compositeGState:...fraction:):
+	Corrected cases for flipped surface.
+
 2006-12-31 Richard Frith-Macdonald <rfm@gnu.org>
 
 	* configure.ac:  Explicitly add freetype libs and flags when building

Source/cairo/CairoGState.m

@@ -1,4 +1,3 @@
-
 /*
  * CairoGState.m
 
@@ -125,6 +124,19 @@
   [self DPSinitgraphics];
 }
 
+- (void) setOffset: (NSPoint)theOffset
+{
+  NSSize size = {0, 0};
+
+  if (_surface != nil)
+    {
+      size = [_surface size];
+    }
+  [super setOffset: theOffset];
+  cairo_surface_set_device_offset([_surface surface], -theOffset.x, 
+				  theOffset.y - size.height);
+}
+
 /*
  * Color operations
  */
@@ -395,22 +407,15 @@
     {
       cairo_matrix_t local_matrix;
 
+      // cairo draws the other way around.
       cairo_matrix_init_scale(&local_matrix, 1, -1);
 
       if (_surface != nil)
         {
-	  cairo_matrix_translate(&local_matrix, -offset.x, -offset.y);
+	  cairo_matrix_translate(&local_matrix, 0,  -[_surface size].height);
 	}
       cairo_set_matrix(_ct, &local_matrix);
     }
-  else if (_surface != nil)
-    {
-      cairo_matrix_t local_matrix;
-
-      cairo_matrix_init_translate(&local_matrix, -offset.x, 
-				  offset.y - [_surface size].height);
-      cairo_set_matrix(_ct, &local_matrix);
-    }
 }
 
 - (void) DPSrotate: (float)angle
@@ -437,24 +442,20 @@
 
   transform = [NSAffineTransform transform];
   cairo_get_matrix(_ct, &local_matrix);
-/*
+
-  NSLog(@"Before flip %f %f, %f, %f, %f, %f", local_matrix.xx, local_matrix.yx, 
+  // Undo changes in DPSinitmatrix
-	local_matrix.xy, local_matrix.yy, local_matrix.x0, local_matrix.y0);
-*/
   if (!viewIsFlipped)
     {
-      if (_surface)
-	{
-	  cairo_matrix_init_translate(&flip_matrix, 0, -[_surface size].height);
-	  cairo_matrix_multiply(&local_matrix, &local_matrix, &flip_matrix);
-	}
       cairo_matrix_init_scale(&flip_matrix, 1, -1);
       cairo_matrix_multiply(&local_matrix, &local_matrix, &flip_matrix);
+
+      if (_surface)
+	{
+	  cairo_matrix_init_translate(&flip_matrix, 0, [_surface size].height);
+	  cairo_matrix_multiply(&local_matrix, &local_matrix, &flip_matrix);
 	}
-/*
+    }
-  NSLog(@"After flip %f %f, %f, %f, %f, %f", local_matrix.xx, local_matrix.yx, 
+
-	local_matrix.xy, local_matrix.yy, local_matrix.x0, local_matrix.y0);
-*/ 
   tstruct.m11 = local_matrix.xx;
   tstruct.m12 = local_matrix.yx;
   tstruct.m21 = local_matrix.xy;
@@ -972,41 +973,37 @@ _set_op(cairo_t * ct, NSCompositingOperation op)
   double minx, miny;
   double width, height;
 
+  cairo_save(_ct);
+  cairo_new_path(_ct);
+  _set_op(_ct, op);
+
+  src = cairo_get_target(source->_ct);
+  if (src == cairo_get_target(_ct))
+    {
  /*
+      NSLog(@"Copy onto self");
       NSLog(NSStringFromRect(aRect));
       NSLog(NSStringFromPoint(aPoint));
       NSLog(@"src %p(%p,%@) des %p(%p,%@)", 
 	    source,cairo_get_target(source->_ct),NSStringFromSize([source->_surface size]),
 	    self,cairo_get_target(_ct),NSStringFromSize([_surface size]));
   */
-
-  cairo_save(_ct);
-  //cairo_new_path(_ct);
-  _set_op(_ct, op);
-
-  src = cairo_get_target(source->_ct);
-  if (src == cairo_get_target(_ct))
-    {
-      //NSLog(@"Copy onto self");
     }
 
   minx = NSMinX(aRect);
   miny = NSMinY(aRect);
   width = NSWidth(aRect);
   height = NSHeight(aRect);
-  /*
+
-  cairo_user_to_device(source->_ct, &minx, &miny);
-  cairo_user_to_device_distance(source->_ct, &width, &height);
-  cairo_device_to_user(_ct, &minx, &miny);
-  cairo_device_to_user_distance(_ct, &width, &height);
-  NSLog(@"Rect %@  = %f, %f, %f, %f", NSStringFromRect(aRect), minx, miny, width, height);
-  */
   if (viewIsFlipped)
     {
-/*
       if (!source->viewIsFlipped)
         {
-	  // Undo flipping of the source coordinate system
+	  cairo_set_source_surface(_ct, src, aPoint.x - minx, aPoint.y - miny - height);
+	}
+      else 
+        {
+	  // Both flipped
 	  cairo_pattern_t *cpattern;
 	  cairo_matrix_t local_matrix;
 	  
@@ -1017,18 +1014,13 @@ _set_op(cairo_t * ct, NSCompositingOperation op)
 	  cairo_set_source(_ct, cpattern);
 	  cairo_pattern_destroy(cpattern);
 	}
-      else 
-*/
-        {
-	  cairo_set_source_surface(_ct, src, aPoint.x - minx, aPoint.y - miny - height);
-	}
       cairo_rectangle(_ct, aPoint.x, aPoint.y - height, width, height);
     }
   else 
     {
       if (!source->viewIsFlipped)
         {
-	  // Undo flipping of the source coordinate system
+	  // Both non-flipped. 
 	  cairo_pattern_t *cpattern;
 	  cairo_matrix_t local_matrix;