removing coord change matrices

include/gpu/GrFragmentStage.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrFragmentStage_DEFINED
 #define GrFragmentStage_DEFINED
 
 #include "GrFragmentProcessor.h"
-#include "SkMatrix.h"
 
 /**
- * Wraps a GrFragmentProcessor. It also contains a coord change matrix. This matrix should be
- * concat'ed with all the processor's coord transforms that apply to local coords, unless
- * explicit local coords are provided with the draw.
+ * Wraps a GrFragmentProcessor, basically a copyable SkAutoTUnref
  */
 class GrFragmentStage {
 public:
-    explicit GrFragmentStage(const GrFragmentProcessor* proc)
-    : fProc(SkRef(proc)) {
-        fCoordChangeMatrixSet = false;
+    explicit GrFragmentStage(const GrFragmentProcessor* proc) : fProc(SkRef(proc)) {}
+
+    GrFragmentStage(const GrFragmentStage& other) { fProc.reset(SkRef(other.fProc.get())); }
+
+    const GrFragmentProcessor* processor() const { return fProc.get(); }
+
+    bool operator==(const GrFragmentStage& that) const {
+        return this->processor() == that.processor();
     }
 
-    GrFragmentStage(const GrFragmentStage& other) {
-        fCoordChangeMatrixSet = other.fCoordChangeMatrixSet;
-        if (other.fCoordChangeMatrixSet) {
-            fCoordChangeMatrix = other.fCoordChangeMatrix;
-        }
-        fProc.reset(SkRef(other.fProc.get()));
-    }
-
-    static bool AreCompatible(const GrFragmentStage& a, const GrFragmentStage& b,
-                              bool usingExplicitLocalCoords) {
-        SkASSERT(a.fProc.get());
-        SkASSERT(b.fProc.get());
-
-        if (!a.getProcessor()->isEqual(*b.getProcessor())) {
-            return false;
-        }
-
-        // We always track the coord change matrix, but it has no effect when explicit local coords
-        // are used.
-        if (usingExplicitLocalCoords) {
-            return true;
-        }
-
-        if (a.fCoordChangeMatrixSet != b.fCoordChangeMatrixSet) {
-            return false;
-        }
-
-        if (!a.fCoordChangeMatrixSet) {
-            return true;
-        }
-
-        return a.fCoordChangeMatrix == b.fCoordChangeMatrix;
-    }
-
-    /**
-     * This is called when the coordinate system in which the geometry is specified will change.
-     *
-     * @param matrix    The transformation from the old coord system in which geometry is specified
-     *                  to the new one from which it will actually be drawn.
-     */
-    void localCoordChange(const SkMatrix& matrix) {
-        if (fCoordChangeMatrixSet) {
-            fCoordChangeMatrix.preConcat(matrix);
-        } else {
-            fCoordChangeMatrixSet = true;
-            fCoordChangeMatrix = matrix;
-        }
-    }
-
-    class SavedCoordChange {
-    public:
-        SkDEBUGCODE(SavedCoordChange() : fEffectUniqueID(SK_InvalidUniqueID) {})
-    private:
-        bool fCoordChangeMatrixSet;
-        SkMatrix fCoordChangeMatrix;
-        SkDEBUGCODE(mutable uint32_t fEffectUniqueID;)
-
-        friend class GrFragmentStage;
-    };
-
-    /**
-     * This gets the current coordinate system change. It is the accumulation of
-     * localCoordChange calls since the effect was installed. It is used when then caller
-     * wants to temporarily change the source geometry coord system, draw something, and then
-     * restore the previous coord system (e.g. temporarily draw in device coords).
-     */
-    void saveCoordChange(SavedCoordChange* savedCoordChange) const {
-        savedCoordChange->fCoordChangeMatrixSet = fCoordChangeMatrixSet;
-        if (fCoordChangeMatrixSet) {
-            savedCoordChange->fCoordChangeMatrix = fCoordChangeMatrix;
-        }
-        SkASSERT(SK_InvalidUniqueID == savedCoordChange->fEffectUniqueID);
-        SkDEBUGCODE(savedCoordChange->fEffectUniqueID = fProc->getUniqueID();)
-    }
-
-    /**
-     * This balances the saveCoordChange call.
-     */
-    void restoreCoordChange(const SavedCoordChange& savedCoordChange) {
-        fCoordChangeMatrixSet = savedCoordChange.fCoordChangeMatrixSet;
-        if (fCoordChangeMatrixSet) {
-            fCoordChangeMatrix = savedCoordChange.fCoordChangeMatrix;
-        }
-        SkASSERT(savedCoordChange.fEffectUniqueID == fProc->getUniqueID());
-        SkDEBUGCODE(savedCoordChange.fEffectUniqueID = SK_InvalidUniqueID);
-    }
-
-    /**
-     * Gets the matrix representing all changes of coordinate system since the GrProcessor was
-     * installed in the stage.
-     */
-    const SkMatrix& getCoordChangeMatrix() const {
-        if (fCoordChangeMatrixSet) {
-            return fCoordChangeMatrix;
-        } else {
-            return SkMatrix::I();
-        }
-    }
-
-    const GrFragmentProcessor* getProcessor() const { return fProc.get(); }
+    bool operator!=(const GrFragmentStage& that) const { return !(*this == that); }
 
 protected:
-    bool                                    fCoordChangeMatrixSet;
-    SkMatrix                                fCoordChangeMatrix;
     SkAutoTUnref<const GrFragmentProcessor> fProc;
 };
 
 #endif