Add public API for setting the blend mode on a page object.
BUG=pdfium:720
R=npm@chromium.org
Change-Id: I2a43b34da6946265ca06502b9ff19ad352fd18cb
Reviewed-on: https://pdfium-review.googlesource.com/5953
Commit-Queue: Nicolás Peña <npm@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>
diff --git a/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp b/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
index e9ea064..2cf10bd 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
+++ b/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
@@ -225,8 +225,12 @@
GraphicsData graphD;
graphD.fillAlpha = pPageObj->m_GeneralState.GetFillAlpha();
graphD.strokeAlpha = pPageObj->m_GeneralState.GetStrokeAlpha();
- if (graphD.fillAlpha == 1.0f && graphD.strokeAlpha == 1.0f)
+ int blend_type = pPageObj->m_GeneralState.GetBlendType();
+ if (graphD.fillAlpha == 1.0f && graphD.strokeAlpha == 1.0f &&
+ (blend_type == FXDIB_BLEND_UNSUPPORTED ||
+ blend_type == FXDIB_BLEND_NORMAL)) {
return;
+ }
CFX_ByteString name;
auto it = m_pPage->m_GraphicsMap.find(graphD);
@@ -234,8 +238,17 @@
name = it->second;
} else {
auto gsDict = pdfium::MakeUnique<CPDF_Dictionary>();
- gsDict->SetNewFor<CPDF_Number>("ca", graphD.fillAlpha);
- gsDict->SetNewFor<CPDF_Number>("CA", graphD.strokeAlpha);
+ if (graphD.fillAlpha != 1.0f)
+ gsDict->SetNewFor<CPDF_Number>("ca", graphD.fillAlpha);
+
+ if (graphD.strokeAlpha != 1.0f)
+ gsDict->SetNewFor<CPDF_Number>("CA", graphD.strokeAlpha);
+
+ if (blend_type != FXDIB_BLEND_UNSUPPORTED &&
+ blend_type != FXDIB_BLEND_NORMAL) {
+ gsDict->SetNewFor<CPDF_Name>("BM",
+ pPageObj->m_GeneralState.GetBlendMode());
+ }
CPDF_Object* pDict = m_pDocument->AddIndirectObject(std::move(gsDict));
uint32_t dwObjNum = pDict->GetObjNum();
name = RealizeResource(dwObjNum, "ExtGState");
diff --git a/core/fpdfapi/page/cpdf_generalstate.cpp b/core/fpdfapi/page/cpdf_generalstate.cpp
index e07a3ca..5407074 100644
--- a/core/fpdfapi/page/cpdf_generalstate.cpp
+++ b/core/fpdfapi/page/cpdf_generalstate.cpp
@@ -78,6 +78,43 @@
void CPDF_GeneralState::SetRenderIntent(const CFX_ByteString& ri) {
m_Ref.GetPrivateCopy()->m_RenderIntent = RI_StringToId(ri);
}
+CFX_ByteString CPDF_GeneralState::GetBlendMode() const {
+ switch (GetBlendType()) {
+ case FXDIB_BLEND_NORMAL:
+ return CFX_ByteString("Normal");
+ case FXDIB_BLEND_MULTIPLY:
+ return CFX_ByteString("Multiply");
+ case FXDIB_BLEND_SCREEN:
+ return CFX_ByteString("Screen");
+ case FXDIB_BLEND_OVERLAY:
+ return CFX_ByteString("Overlay");
+ case FXDIB_BLEND_DARKEN:
+ return CFX_ByteString("Darken");
+ case FXDIB_BLEND_LIGHTEN:
+ return CFX_ByteString("Lighten");
+ case FXDIB_BLEND_COLORDODGE:
+ return CFX_ByteString("ColorDodge");
+ case FXDIB_BLEND_COLORBURN:
+ return CFX_ByteString("ColorBurn");
+ case FXDIB_BLEND_HARDLIGHT:
+ return CFX_ByteString("HardLight");
+ case FXDIB_BLEND_SOFTLIGHT:
+ return CFX_ByteString("SoftLight");
+ case FXDIB_BLEND_DIFFERENCE:
+ return CFX_ByteString("Difference");
+ case FXDIB_BLEND_EXCLUSION:
+ return CFX_ByteString("Exclusion");
+ case FXDIB_BLEND_HUE:
+ return CFX_ByteString("Hue");
+ case FXDIB_BLEND_SATURATION:
+ return CFX_ByteString("Saturation");
+ case FXDIB_BLEND_COLOR:
+ return CFX_ByteString("Color");
+ case FXDIB_BLEND_LUMINOSITY:
+ return CFX_ByteString("Luminosity");
+ }
+ return CFX_ByteString("Normal");
+}
int CPDF_GeneralState::GetBlendType() const {
const StateData* pData = m_Ref.GetObject();
diff --git a/core/fpdfapi/page/cpdf_generalstate.h b/core/fpdfapi/page/cpdf_generalstate.h
index 4ec08ca..3568416 100644
--- a/core/fpdfapi/page/cpdf_generalstate.h
+++ b/core/fpdfapi/page/cpdf_generalstate.h
@@ -27,6 +27,7 @@
void SetRenderIntent(const CFX_ByteString& ri);
+ CFX_ByteString GetBlendMode() const;
int GetBlendType() const;
void SetBlendType(int type);
diff --git a/fpdfsdk/fpdfeditpage.cpp b/fpdfsdk/fpdfeditpage.cpp
index 37469ed..a474414 100644
--- a/fpdfsdk/fpdfeditpage.cpp
+++ b/fpdfsdk/fpdfeditpage.cpp
@@ -264,6 +264,15 @@
pPageObj->Transform(matrix);
}
+DLLEXPORT void STDCALL FPDFPageObj_SetBlendMode(FPDF_PAGEOBJECT page_object,
+ FPDF_BYTESTRING blend_mode) {
+ CPDF_PageObject* pPageObj = static_cast<CPDF_PageObject*>(page_object);
+ if (!pPageObj)
+ return;
+
+ pPageObj->m_GeneralState.SetBlendMode(blend_mode);
+}
+
DLLEXPORT void STDCALL FPDFPage_TransformAnnots(FPDF_PAGE page,
double a,
double b,
diff --git a/public/fpdf_edit.h b/public/fpdf_edit.h
index 677bdb2..2014e6f 100644
--- a/public/fpdf_edit.h
+++ b/public/fpdf_edit.h
@@ -311,6 +311,17 @@
float* right,
float* top);
+// Set the blend mode of |pageObject|.
+//
+// pageObject - handle to a page object.
+// blend_mode - string containing the blend mode.
+//
+// Blend mode can be one of following: Color, ColorBurn, ColorDodge, Darken,
+// Difference, Exclusion, HardLight, Hue, Lighten, Luminosity, Multiply, Normal,
+// Overlay, Saturation, Screen, SoftLight
+DLLEXPORT void STDCALL FPDFPageObj_SetBlendMode(FPDF_PAGEOBJECT page,
+ FPDF_BYTESTRING blend_mode);
+
// Set the stroke RGBA of a path. Range of values: 0 - 255.
//
// path - the handle to the path object.
