pdfviewer: implementation of one type of pattern - simple tile patern, colored, with xstep and yste…

experimental/PdfViewer/SkPdfBasics.h

 #ifndef __DEFINED__SkPdfBasics
 #define __DEFINED__SkPdfBasics
 
 #include "SkCanvas.h"
 #include "SkPaint.h"
 #include "SkPdfConfig.h"
 
 #include <iostream>
 #include <cstdio>
 #include <map>
 #include <stack>
 
 class SkPdfFont;
 class SkPdfDoc;
 class SkPdfObject;
 class SkPdfResourceDictionary;
 class SkPdfSoftMaskDictionary;
 
 class SkNativeParsedPDF;
 class SkPdfAllocator;
 
 // TODO(edisonn): better class design.
-struct SkPdfColorOperator {
+class SkPdfColorOperator {
 
     /*
     color space   name or array     The current color space in which color values are to be interpreted
                                     (see Section 4.5, “Color Spaces”). There are two separate color space
                                     parameters: one for stroking and one for all other painting opera-
                                     tions. Initial value: DeviceGray.
      */
 
     // TODO(edisonn): implement the array part too
     // does not own the char*
+// TODO(edisonn): remove this public, let fields be private
+// TODO(edisonn): make color space an enum!
+public:
     NotOwnedString fColorSpace;
-
+    SkPdfObject* fPattern;
 
     /*
     color         (various)         The current color to be used during painting operations (see Section
                                     4.5, “Color Spaces”). The type and interpretation of this parameter
                                     depend on the current color space; for most color spaces, a color
                                     value consists of one to four numbers. There are two separate color
                                     parameters: one for stroking and one for all other painting opera-
                                     tions. Initial value: black.
      */
 
     SkColor fColor;
     double fOpacity;  // ca or CA
+
     // TODO(edisonn): add here other color space options.
 
+public:
     void setRGBColor(SkColor color) {
         // TODO(edisonn): ASSERT DeviceRGB is the color space.
+        fPattern = NULL;
         fColor = color;
     }
     // TODO(edisonn): double check the default values for all fields.
-    SkPdfColorOperator() : fColor(SK_ColorBLACK), fOpacity(1) {
-        NotOwnedString::init(&fColorSpace);
+    SkPdfColorOperator() : fPattern(NULL), fColor(SK_ColorBLACK), fOpacity(1) {
+        NotOwnedString::init(&fColorSpace, "DeviceRGB");
+    }
+
+    void setColorSpace(NotOwnedString* colorSpace) {
+        fColorSpace = *colorSpace;
+        fPattern = NULL;
+    }
+
+    void setPatternColorSpace(SkPdfObject* pattern) {
+        fColorSpace.fBuffer = (const unsigned char*)"Pattern";
+        fColorSpace.fBytes = 7;  // strlen("Pattern")
+        fPattern = pattern;
     }
 
     void applyGraphicsState(SkPaint* paint) {
         paint->setColor(SkColorSetA(fColor, (U8CPU)(fOpacity * 255)));
     }
 };
 
 // TODO(edisonn): better class design.
 struct SkPdfGraphicsState {
     // TODO(edisonn): deprecate and remove these!
@@ skipping 303 matching lines @@
     kPartial_PdfResult,
     kNYI_PdfResult,
     kIgnoreError_PdfResult,
     kError_PdfResult,
     kUnsupported_PdfResult,
 
     kCount_PdfResult
 };
 
 #endif  // __DEFINED__SkPdfBasics