From 410223aec5614206e8fb485e181791bd3abd80f7 Mon Sep 17 00:00:00 2001
From: Tavmjong Bah <tavmjong@free.fr>
Date: Tue, 12 Nov 2013 15:28:10 +0100
Subject: Partial fix for blocker bug 1163449: "Imported bitmap appear blurry
 when zoomed in" Setting style to include "image-rendering:optimizeSpeed" will
 cause nearest neighbor filter to be used in downscaling.

(bzr r12796)
---
 src/display/drawing-context.h |  4 ++++
 src/display/drawing-image.cpp | 25 ++++++++++++++++++-------
 2 files changed, 22 insertions(+), 7 deletions(-)

(limited to 'src/display')

diff --git a/src/display/drawing-context.h b/src/display/drawing-context.h
index d4f0dbfc3..35be9a86b 100644
--- a/src/display/drawing-context.h
+++ b/src/display/drawing-context.h
@@ -111,6 +111,10 @@ public:
     void setSource(DrawingSurface *s);
     void setSourceCheckerboard();
 
+    void patternSetFilter(cairo_filter_t filter) {
+        cairo_pattern_set_filter(cairo_get_source(_ct), filter);
+    }
+
     Geom::Rect targetLogicalBounds() const;
 
     cairo_t *raw() { return _ct; }
diff --git a/src/display/drawing-image.cpp b/src/display/drawing-image.cpp
index a9c0499c2..1b9214c49 100644
--- a/src/display/drawing-image.cpp
+++ b/src/display/drawing-image.cpp
@@ -108,13 +108,6 @@ unsigned DrawingImage::_renderItem(DrawingContext &ct, Geom::IntRect const &/*ar
 
     if (!outline) {
         if (!_pixbuf) return RENDER_OK;
-        
-        // if (_style) {
-            // _style->image_rendering.computed
-            // See: http://www.w3.org/TR/SVG/painting.html#ImageRenderingProperty
-            //      http://www.w3.org/TR/css4-images/#the-image-rendering
-            //      style.h/style.cpp
-        // }
 
         Inkscape::DrawingContext::Save save(ct);
         ct.transform(_ctm);
@@ -126,6 +119,24 @@ unsigned DrawingImage::_renderItem(DrawingContext &ct, Geom::IntRect const &/*ar
         ct.scale(_scale);
         ct.setSource(_pixbuf->getSurfaceRaw(), 0, 0);
 
+        if (_style) {
+            // See: http://www.w3.org/TR/SVG/painting.html#ImageRenderingProperty
+            //      http://www.w3.org/TR/css4-images/#the-image-rendering
+            //      style.h/style.cpp
+            switch (_style->image_rendering.computed) {
+                case SP_CSS_COLOR_RENDERING_AUTO:
+                    // Do nothing
+                    break;
+                case SP_CSS_COLOR_RENDERING_OPTIMIZEQUALITY:
+                    ct.patternSetFilter( CAIRO_FILTER_BEST );
+                    break;
+                case SP_CSS_COLOR_RENDERING_OPTIMIZESPEED:
+                default:
+                    ct.patternSetFilter( CAIRO_FILTER_NEAREST );
+                    break;
+            }
+        }
+
         ct.paint(_opacity);
 
     } else { // outline; draw a rect instead
-- 
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