collapse some unused type hierarchy

SkBitmapProcState is the only subclass of SkBitmapProcInfo, and
BitmapProcShaderContext the only subclass of BitmapProcInfoContext.

This folds it all together, and should be a no-op refactor.

Change-Id: I971c03dbbebfcd1651ddac2f1b624329f415cc35
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/313439
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/src/shaders/SkBitmapProcShader.cpp b/src/shaders/SkBitmapProcShader.cpp
index d630c45..a168b1a 100644
--- a/src/shaders/SkBitmapProcShader.cpp
+++ b/src/shaders/SkBitmapProcShader.cpp
@@ -11,48 +11,30 @@
 #include "src/core/SkBitmapProcState.h"
 #include "src/core/SkXfermodePriv.h"
 
-static bool only_scale_and_translate(const SkMatrix& matrix) {
-    unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask;
-    return (matrix.getType() & ~mask) == 0;
-}
-
-class BitmapProcInfoContext : public SkShaderBase::Context {
+class BitmapProcShaderContext : public SkShaderBase::Context {
 public:
-    // The info has been allocated elsewhere, but we are responsible for calling its destructor.
-    BitmapProcInfoContext(const SkShaderBase& shader, const SkShaderBase::ContextRec& rec,
-                            SkBitmapProcInfo* info)
+    BitmapProcShaderContext(const SkShaderBase& shader, const SkShaderBase::ContextRec& rec,
+                            SkBitmapProcState* state)
         : INHERITED(shader, rec)
-        , fInfo(info)
+        , fState(state)
+        , fFlags(0)
     {
-        fFlags = 0;
-        if (fInfo->fPixmap.isOpaque() && (255 == this->getPaintAlpha())) {
+        if (fState->fPixmap.isOpaque() && (255 == this->getPaintAlpha())) {
             fFlags |= SkShaderBase::kOpaqueAlpha_Flag;
         }
 
-        if (1 == fInfo->fPixmap.height() && only_scale_and_translate(this->getTotalInverse())) {
+        auto only_scale_and_translate = [](const SkMatrix& matrix) {
+            unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask;
+            return (matrix.getType() & ~mask) == 0;
+        };
+
+        if (1 == fState->fPixmap.height() && only_scale_and_translate(this->getTotalInverse())) {
             fFlags |= SkShaderBase::kConstInY32_Flag;
         }
     }
 
     uint32_t getFlags() const override { return fFlags; }
 
-private:
-    SkBitmapProcInfo*   fInfo;
-    uint32_t            fFlags;
-
-    typedef SkShaderBase::Context INHERITED;
-};
-
-///////////////////////////////////////////////////////////////////////////////////////////////////
-
-class BitmapProcShaderContext : public BitmapProcInfoContext {
-public:
-    BitmapProcShaderContext(const SkShaderBase& shader, const SkShaderBase::ContextRec& rec,
-                            SkBitmapProcState* state)
-        : INHERITED(shader, rec, state)
-        , fState(state)
-    {}
-
     void shadeSpan(int x, int y, SkPMColor dstC[], int count) override {
         const SkBitmapProcState& state = *fState;
         if (state.getShaderProc32()) {
@@ -85,8 +67,9 @@
 
 private:
     SkBitmapProcState*  fState;
+    uint32_t            fFlags;
 
-    typedef BitmapProcInfoContext INHERITED;
+    typedef SkShaderBase::Context INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////