vcl: Limit Cairo surface size to the clipping region to improve performance

Conflicts:
	vcl/unx/generic/gdi/openglx11cairotextrender.cxx

Change-Id: I469b34c9f1047a274550229391d3dfb578291df6

8 files changed, 57 insertions, 2 deletions

diff --git a/vcl/inc/cairotextrender.hxx b/vcl/inc/cairotextrender.hxx
index e5db2ab7e612..2b8a21ef68fb 100644
--- a/vcl/inc/cairotextrender.hxx
+++ b/vcl/inc/cairotextrender.hxx
@@ -77,6 +77,7 @@ class CairoTextRender : public TextRenderImpl
 protected:
     virtual GlyphCache& getPlatformGlyphCache() = 0;
     virtual cairo_surface_t* getCairoSurface() = 0;
+    virtual void getSurfaceOffset(double& nDX, double& nDY) = 0;
     virtual void drawSurface(cairo_t* cr) = 0;
 
 bool setFont( const FontSelectPattern *pEntry, int nFallbackLevel );
diff --git a/vcl/inc/openglgdiimpl.hxx b/vcl/inc/openglgdiimpl.hxx
index 3621aabb34e8..2c911eeb50d7 100644
--- a/vcl/inc/openglgdiimpl.hxx
+++ b/vcl/inc/openglgdiimpl.hxx
@@ -133,7 +133,9 @@ public:
 
     virtual void freeResources() SAL_OVERRIDE;
 
+    virtual const vcl::Region& getClipRegion() const;
     virtual bool setClipRegion( const vcl::Region& ) SAL_OVERRIDE;
+
     //
     // get the depth of the device
     virtual sal_uInt16 GetBitCount() const SAL_OVERRIDE;
diff --git a/vcl/opengl/gdiimpl.cxx b/vcl/opengl/gdiimpl.cxx
index 611b72dc86ce..1b4d9d01cf26 100644
--- a/vcl/opengl/gdiimpl.cxx
+++ b/vcl/opengl/gdiimpl.cxx
@@ -226,6 +226,11 @@ void OpenGLSalGraphicsImpl::ImplInitClipRegion()
     CHECK_GL_ERROR();
 }
 
+const vcl::Region& OpenGLSalGraphicsImpl::getClipRegion() const
+{
+    return maClipRegion;
+}
+
 bool OpenGLSalGraphicsImpl::setClipRegion( const vcl::Region& rClip )
 {
     SAL_INFO( "vcl.opengl", "::setClipRegion " << rClip );
diff --git a/vcl/unx/generic/gdi/cairotextrender.cxx b/vcl/unx/generic/gdi/cairotextrender.cxx
index 5b31b92fd42a..589b53ae2dd1 100644
--- a/vcl/unx/generic/gdi/cairotextrender.cxx
+++ b/vcl/unx/generic/gdi/cairotextrender.cxx
@@ -222,6 +222,10 @@ void CairoTextRender::DrawServerFontLayout( const ServerFontLayout& rLayout )
     if (const void *pOptions = Application::GetSettings().GetStyleSettings().GetCairoFontOptions())
         cairo_set_font_options(cr, static_cast<const cairo_font_options_t*>(pOptions));
 
+    double nDX, nDY;
+    getSurfaceOffset(nDX, nDY);
+    cairo_translate(cr, nDX, nDY);
+
     clipRegion(cr);
 
     cairo_set_source_rgb(cr,
diff --git a/vcl/unx/generic/gdi/openglx11cairotextrender.cxx b/vcl/unx/generic/gdi/openglx11cairotextrender.cxx
index f16fe966b4b7..7b4e6643eb1a 100644
--- a/vcl/unx/generic/gdi/openglx11cairotextrender.cxx
+++ b/vcl/unx/generic/gdi/openglx11cairotextrender.cxx
@@ -25,10 +25,32 @@ cairo_surface_t* OpenGLX11CairoTextRender::getCairoSurface()
     // static size_t id = 0;
     // OString aFileName = OString("/tmp/libo_logs/text_rendering") + OString::number(id++) + OString(".svg");
     // cairo_surface_t* surface = cairo_svg_surface_create(aFileName.getStr(), GetWidth(), GetHeight());
-    cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, GetWidth(), GetHeight());
+    cairo_surface_t* surface = NULL;
+    OpenGLSalGraphicsImpl *pImpl = dynamic_cast< OpenGLSalGraphicsImpl* >(mrParent.GetImpl());
+    if( pImpl )
+    {
+        Rectangle aClipRect = pImpl->getClipRegion().GetBoundRect();
+        if( aClipRect.GetWidth() == 0 || aClipRect.GetHeight() == 0 )
+        {
+            aClipRect.setWidth( GetWidth() );
+            aClipRect.setHeight( GetHeight() );
+        }
+        surface = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, aClipRect.GetWidth(), aClipRect.GetHeight() );
+    }
     return surface;
 }
 
+void OpenGLX11CairoTextRender::getSurfaceOffset( double& nDX, double& nDY )
+{
+    OpenGLSalGraphicsImpl *pImpl = dynamic_cast< OpenGLSalGraphicsImpl* >(mrParent.GetImpl());
+    if( pImpl )
+    {
+        Rectangle aClipRect = pImpl->getClipRegion().GetBoundRect();
+        nDX = -aClipRect.Left();
+        nDY = -aClipRect.Top();
+    }
+}
+
 void OpenGLX11CairoTextRender::drawSurface(cairo_t* cr)
 {
     // XXX: lfrb: GLES 2.0 doesn't support GL_UNSIGNED_INT_8_8_8_8_REV
@@ -42,7 +64,20 @@ void OpenGLX11CairoTextRender::drawSurface(cairo_t* cr)
     cairo_surface_flush( pSurface );
     unsigned char *pSrc = cairo_image_surface_get_data( pSurface );
 
-    SalTwoRect aRect(0, 0, nWidth, nHeight, 0, 0, nWidth, nHeight);
+    // XXX: lfrb: GLES 2.0 doesn't support GL_UNSIGNED_INT_8_8_8_8_REV
+    Rectangle aClipRect = pImpl->getClipRegion().GetBoundRect();
+
+    SalTwoRect aRect(0, 0, nWidth, nHeight,
+            aClipRect.Left(), aClipRect.Top(), nWidth, nHeight);
+    aRect.mnSrcX = 0;
+    aRect.mnSrcY = 0;
+    aRect.mnSrcWidth = nWidth;
+    aRect.mnSrcHeight = nHeight;
+    aRect.mnDestX = aClipRect.Left();
+    aRect.mnDestY = aClipRect.Top();
+    aRect.mnDestWidth = nWidth;
+    aRect.mnDestHeight = nHeight;
+
     // Cairo surface data is ARGB with premultiplied alpha and is Y-inverted
     OpenGLTexture aTexture( nWidth, nHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, pSrc );
     pImpl->PreDraw();
diff --git a/vcl/unx/generic/gdi/openglx11cairotextrender.hxx b/vcl/unx/generic/gdi/openglx11cairotextrender.hxx
index 87ef9483cacb..171949651635 100644
--- a/vcl/unx/generic/gdi/openglx11cairotextrender.hxx
+++ b/vcl/unx/generic/gdi/openglx11cairotextrender.hxx
@@ -18,6 +18,7 @@ public:
     OpenGLX11CairoTextRender(bool bPrinter, X11SalGraphics& rParent);
 
     virtual cairo_surface_t* getCairoSurface() SAL_OVERRIDE;
+    virtual void getSurfaceOffset(double& nDX, double& nDY) SAL_OVERRIDE;
     virtual void drawSurface(cairo_t* cr) SAL_OVERRIDE;
 };
 
diff --git a/vcl/unx/generic/gdi/x11cairotextrender.cxx b/vcl/unx/generic/gdi/x11cairotextrender.cxx
index 0449b98148b1..f3aa47d07800 100644
--- a/vcl/unx/generic/gdi/x11cairotextrender.cxx
+++ b/vcl/unx/generic/gdi/x11cairotextrender.cxx
@@ -77,6 +77,12 @@ cairo_surface_t* X11CairoTextRender::getCairoSurface()
     return surface;
 }
 
+void X11CairoTextRender::getSurfaceOffset( double& nDX, double& nDY )
+{
+    nDX = 0;
+    nDY = 0;
+}
+
 void X11CairoTextRender::clipRegion(cairo_t* cr)
 {
     Region pClipRegion = mrParent.mpClipRegion;
diff --git a/vcl/unx/generic/gdi/x11cairotextrender.hxx b/vcl/unx/generic/gdi/x11cairotextrender.hxx
index fb0c130ab292..1449b3aa0dc5 100644
--- a/vcl/unx/generic/gdi/x11cairotextrender.hxx
+++ b/vcl/unx/generic/gdi/x11cairotextrender.hxx
@@ -41,6 +41,7 @@ public:
 
     virtual GlyphCache& getPlatformGlyphCache() SAL_OVERRIDE;
     virtual cairo_surface_t* getCairoSurface() SAL_OVERRIDE;
+    virtual void getSurfaceOffset(double& nDX, double& nDY) SAL_OVERRIDE;
     virtual void clipRegion(cairo_t* cr) SAL_OVERRIDE;
     virtual void drawSurface(cairo_t* cr) SAL_OVERRIDE;
 };