From 30dbcc1a232448214ab5bc3da7b974d97a7345da Mon Sep 17 00:00:00 2001
From: Adrian Johnson <ajohnson@redneon.com>
Date: Wed, 3 Jun 2009 22:08:57 +0930
Subject: [PATCH] Implement text in pattern colorspace for the cairo backend

---
 poppler/CairoOutputDev.cc |   47 +++++++++++++++++++++++++++++++++++++++++++++
 poppler/CairoOutputDev.h  |   19 ++++++++++++++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/poppler/CairoOutputDev.cc b/poppler/CairoOutputDev.cc
index 5d4cb82..199e5ea 100644
--- a/poppler/CairoOutputDev.cc
+++ b/poppler/CairoOutputDev.cc
@@ -124,6 +124,7 @@ CairoOutputDev::CairoOutputDev() {
   stroke_opacity = 1.0;
   fill_opacity = 1.0;
   textClipPath = NULL;
+  haveCSPattern = gFalse;
   cairo = NULL;
   currentFont = NULL;
   prescaleImages = gTrue;
@@ -507,6 +508,15 @@ void CairoOutputDev::updateFont(GfxState *state) {
   cairo_set_font_matrix (cairo, &matrix);
 }
 
+void CairoOutputDev::updateRender(GfxState *state) {
+  int rm;
+  rm = state->getRender();
+  if (rm == 7 && haveCSPattern) {
+    haveCSPattern = gFalse;
+    restoreState(state);
+  }
+}
+
 void CairoOutputDev::doPath(cairo_t *cairo, GfxState *state, GfxPath *path) {
   GfxSubpath *subpath;
   int i, j;
@@ -758,7 +768,40 @@ void CairoOutputDev::type3D1(GfxState *state, double wx, double wy,
   t3_glyph_has_bbox = gTrue;
 }
 
+void CairoOutputDev::beginTextObject(GfxState *state) {
+  if (state->getFillColorSpace()->getMode() == csPattern) {
+    haveCSPattern = gTrue;
+    saveState(state);
+    savedRender = state->getRender();
+    state->setRender(7); // Set clip to text path
+  }
+}
+
 void CairoOutputDev::endTextObject(GfxState *state) {
+  if (haveCSPattern) {
+    state->setRender(savedRender);
+    haveCSPattern = gFalse;
+    if (state->getFillColorSpace()->getMode() != csPattern) {
+      if (textClipPath) {
+	cairo_new_path (cairo);
+	cairo_append_path (cairo, textClipPath);
+	cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_WINDING);
+	cairo_set_source (cairo, fill_pattern);
+	cairo_fill (cairo);
+	if (cairo_shape) {
+	  cairo_new_path (cairo_shape);
+	  cairo_append_path (cairo_shape, textClipPath);
+	  cairo_set_fill_rule (cairo_shape, CAIRO_FILL_RULE_WINDING);
+	  cairo_fill (cairo_shape);
+	}
+	cairo_path_destroy (textClipPath);
+	textClipPath = NULL;
+      }
+      restoreState(state);
+      updateFillColor(state);
+    }
+  }
+
   if (textClipPath) {
     // clip the accumulated text path
     cairo_append_path (cairo, textClipPath);
@@ -1057,6 +1100,10 @@ void CairoOutputDev::clearSoftMask(GfxState * /*state*/) {
   mask = NULL;
 }
 
+void CairoOutputDev::endMaskClip(GfxState *state) {
+  clearSoftMask(state);
+}
+
 void CairoOutputDev::drawImageMask(GfxState *state, Object *ref, Stream *str,
 				    int width, int height, GBool invert,
 				    GBool inlineImg) {
diff --git a/poppler/CairoOutputDev.h b/poppler/CairoOutputDev.h
index 5ec2bf0..7a9283f 100644
--- a/poppler/CairoOutputDev.h
+++ b/poppler/CairoOutputDev.h
@@ -135,6 +135,7 @@ public:
 
   //----- update text state
   virtual void updateFont(GfxState *state);
+  virtual void updateRender(GfxState *state);
 
   //----- path painting
   virtual void stroke(GfxState *state);
@@ -157,8 +158,22 @@ public:
 			       double dx, double dy,
 			       CharCode code, Unicode *u, int uLen);
   virtual void endType3Char(GfxState *state);
+  virtual void beginTextObject(GfxState *state);
+  virtual GBool deviceHasTextClip(GfxState *state) { return textClipPath && haveCSPattern; }
   virtual void endTextObject(GfxState *state);
 
+  // If current colorspace is pattern,
+  // does this device support text in pattern colorspace?
+  virtual GBool supportTextCSPattern(GfxState *state) {
+      return state->getFillColorSpace()->getMode() == csPattern; }
+
+  // If current colorspace is pattern,
+  // need this device special handling for masks in pattern colorspace?
+  virtual GBool fillMaskCSPattern(GfxState * state) {
+      return state->getFillColorSpace()->getMode() == csPattern; }
+
+  virtual void endMaskClip(GfxState *state);
+
   //----- grouping operators
   virtual void beginMarkedContent(char *name, Dict *properties);
   virtual void endMarkedContent(GfxState *state);  
@@ -276,6 +291,10 @@ protected:
       cairo_pattern_t *mask;
       struct MaskStack *next;
   } *maskStack;
+
+  GBool haveCSPattern;	// set if text has been drawn with a
+                        //   clipping render mode because of pattern colorspace
+  int savedRender;	// use if pattern colorspace
 };
 
 //------------------------------------------------------------------------
-- 
1.6.0.4