support gradients and stroke+fill

core/fpdfapi/fpdf_render/fpdf_render_pattern.cpp

Index: core/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
diff --git a/core/fpdfapi/fpdf_render/fpdf_render_pattern.cpp b/core/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
index d4dd8ec211317006ca1c0914506365449c4c8f46..94f38c5186abe97f724101fa7577b100f26f095f 100644
--- a/core/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
+++ b/core/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
@@ -859,6 +859,11 @@ void CPDF_RenderStatus::DrawShading(CPDF_ShadingPattern* pPattern,
     rect.Transform(pMatrix);
     clip_rect.Intersect(rect.GetOutterRect());
   }
+  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_SHADING &&
+      m_pDevice->GetDeviceDriver()->DrawShading(pPattern, pMatrix, alpha,
+                                                bAlphaMode)) {
+    return;
+  }
   CPDF_DeviceBuffer buffer;
   buffer.Initialize(m_pContext, m_pDevice, &clip_rect, m_pCurObj, 150);

[dsinclair, 2016/03/24 17:43:38]

Can the rest of this be moved to a function? Would also be nice to know when we
can remove this, if we get to all skia, can this chunk be removed? Or if we
remove AGG?

[caryclark, 2016/03/25 20:47:56]

I don't know yet what if any of this code can be completely obsoleted. For
instance, because some shaders' functional descriptions are implemented directly
with PostScript, it's unlikely that all of this code will ever be replaced by
Skia native code.

The good news is that nothing here depends on or uses AGG, but it's premature to
restructure anticipating the portions that may be removed.

   CFX_Matrix FinalMatrix = *pMatrix;