Pass a CPDF_ImageObject* into CPDF_ImageRenderer::Start().

Instead of passing in a CPDF_PageObject* and then converting it to an
image, which is always what it is.

Change-Id: I146a476147f4b344417982b5ace002b9bd7b3d80
Reviewed-on: https://pdfium-review.googlesource.com/9810
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
index e6280772c8..e04bd0c0f8 100644
--- a/core/fpdfapi/render/cpdf_imagerenderer.cpp
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -161,13 +161,14 @@ bool CPDF_ImageRenderer::StartRenderDIBSource() {
 }
 
 bool CPDF_ImageRenderer::Start(CPDF_RenderStatus* pStatus,
-                               CPDF_PageObject* pObj,
+                               CPDF_ImageObject* pImageObject,
                                const CFX_Matrix* pObj2Device,
                                bool bStdCS,
                                int blendType) {
+  ASSERT(pImageObject);
   m_pRenderStatus = pStatus;
   m_bStdCS = bStdCS;
-  m_pImageObject = pObj->AsImage();
+  m_pImageObject = pImageObject;
   m_BlendType = blendType;
   m_pObj2Device = pObj2Device;
   CPDF_Dictionary* pOC = m_pImageObject->GetImage()->GetOC();