Split GrSWMaskHelper into its own files

http://codereview.appspot.com/6350046/



git-svn-id: http://skia.googlecode.com/svn/trunk@4380 2bbb7eff-a529-9590-31e7-b0007b416f81

5 files changed, 246 insertions, 220 deletions

diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index 0c4353a3e0..cb543e1979 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -15,9 +15,7 @@
 #include "SkRasterClip.h"
 #include "GrAAConvexPathRenderer.h"
 #include "GrAAHairLinePathRenderer.h"
-
-// TODO: move GrSWMaskHelper out of GrSoftwarePathRender.h & remove this include
-#include "GrSoftwarePathRenderer.h"
+#include "GrSWMaskHelper.h"
 
 //#define GR_AA_CLIP 1
 //#define GR_SW_CLIP 1
diff --git a/src/gpu/GrSWMaskHelper.cpp b/src/gpu/GrSWMaskHelper.cpp
new file mode 100644
index 0000000000..f67336fe6c
--- /dev/null
+++ b/src/gpu/GrSWMaskHelper.cpp
@@ -0,0 +1,181 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrSWMaskHelper.h"
+#include "GrDrawState.h"
+#include "GrGpu.h"
+
+// TODO: try to remove this #include
+#include "GrContext.h"
+
+namespace {
+/*
+ * Convert a boolean operation into a transfer mode code
+ */
+SkXfermode::Mode op_to_mode(SkRegion::Op op) {
+
+    static const SkXfermode::Mode modeMap[] = {
+        SkXfermode::kDstOut_Mode,   // kDifference_Op
+        SkXfermode::kMultiply_Mode, // kIntersect_Op
+        SkXfermode::kSrcOver_Mode,  // kUnion_Op
+        SkXfermode::kXor_Mode,      // kXOR_Op
+        SkXfermode::kClear_Mode,    // kReverseDifference_Op
+        SkXfermode::kSrc_Mode,      // kReplace_Op
+    };
+
+    return modeMap[op];
+}
+
+////////////////////////////////////////////////////////////////////////////////
+SkPath::FillType gr_fill_to_sk_fill(GrPathFill fill) {
+    switch (fill) {
+        case kWinding_GrPathFill:
+            return SkPath::kWinding_FillType;
+        case kEvenOdd_GrPathFill:
+            return SkPath::kEvenOdd_FillType;
+        case kInverseWinding_GrPathFill:
+            return SkPath::kInverseWinding_FillType;
+        case kInverseEvenOdd_GrPathFill:
+            return SkPath::kInverseEvenOdd_FillType;
+        default:
+            GrCrash("Unexpected fill.");
+            return SkPath::kWinding_FillType;
+    }
+}
+
+}
+
+/**
+ * Draw a single rect element of the clip stack into the accumulation bitmap
+ */
+void GrSWMaskHelper::draw(const GrRect& clientRect, SkRegion::Op op, 
+                          bool antiAlias, GrColor color) {
+    SkPaint paint;
+
+    SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
+
+    paint.setXfermode(mode);
+    paint.setAntiAlias(antiAlias);
+    paint.setColor(color);
+
+    fDraw.drawRect(clientRect, paint);
+
+    SkSafeUnref(mode);
+}
+
+/**
+ * Draw a single path element of the clip stack into the accumulation bitmap
+ */
+void GrSWMaskHelper::draw(const SkPath& clientPath, SkRegion::Op op,
+                          GrPathFill fill, bool antiAlias, GrColor color) {
+
+    SkPaint paint;
+    SkPath tmpPath;
+    const SkPath* pathToDraw = &clientPath;
+    if (kHairLine_GrPathFill == fill) {
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setStrokeWidth(SK_Scalar1);
+    } else {
+        paint.setStyle(SkPaint::kFill_Style);
+        SkPath::FillType skfill = gr_fill_to_sk_fill(fill);
+        if (skfill != pathToDraw->getFillType()) {
+            tmpPath = *pathToDraw;
+            tmpPath.setFillType(skfill);
+            pathToDraw = &tmpPath;
+        }
+    }
+    SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
+
+    paint.setXfermode(mode);
+    paint.setAntiAlias(antiAlias);
+    paint.setColor(color);
+
+    fDraw.drawPath(*pathToDraw, paint);
+
+    SkSafeUnref(mode);
+}
+
+bool GrSWMaskHelper::init(const GrIRect& pathDevBounds, 
+                          const GrPoint* translate,
+                          bool useMatrix) {
+    if (useMatrix) {    
+        fMatrix = fContext->getMatrix();
+    } else {
+        fMatrix.setIdentity();
+    }
+
+    if (NULL != translate) {
+        fMatrix.postTranslate(translate->fX, translate->fY);
+    }
+
+    fMatrix.postTranslate(-pathDevBounds.fLeft * SK_Scalar1,
+                          -pathDevBounds.fTop * SK_Scalar1);
+    GrIRect bounds = GrIRect::MakeWH(pathDevBounds.width(),
+                                     pathDevBounds.height());
+
+    fBM.setConfig(SkBitmap::kA8_Config, bounds.fRight, bounds.fBottom);
+    if (!fBM.allocPixels()) {
+        return false;
+    }
+    sk_bzero(fBM.getPixels(), fBM.getSafeSize());
+
+    sk_bzero(&fDraw, sizeof(fDraw));
+    fRasterClip.setRect(bounds);
+    fDraw.fRC    = &fRasterClip;
+    fDraw.fClip  = &fRasterClip.bwRgn();
+    fDraw.fMatrix = &fMatrix;
+    fDraw.fBitmap = &fBM;
+    return true;
+}
+
+/**
+ * Get a texture (from the texture cache) of the correct size & format
+ */
+bool GrSWMaskHelper::getTexture(GrAutoScratchTexture* tex) {
+    GrTextureDesc desc;
+    desc.fWidth = fBM.width();
+    desc.fHeight = fBM.height();
+    desc.fConfig = kAlpha_8_GrPixelConfig;
+
+    tex->set(fContext, desc);
+    GrTexture* texture = tex->texture();
+
+    if (NULL == texture) {
+        return false;
+    }
+
+    return true;
+}
+
+/**
+ * Move the result of the software mask generation back to the gpu
+ */
+void GrSWMaskHelper::toTexture(GrTexture *texture, bool clearToWhite) {
+    SkAutoLockPixels alp(fBM);
+
+    // The destination texture is almost always larger than "fBM". Clear
+    // it appropriately so we don't get mask artifacts outside of the path's
+    // bounding box
+    
+    // "texture" needs to be installed as the render target for the clear
+    // and the texture upload but cannot remain the render target upon
+    // returned. Callers typically use it as a texture and it would then
+    // be both source and dest.
+    GrDrawState::AutoRenderTargetRestore artr(fContext->getGpu()->drawState(), 
+                                              texture->asRenderTarget());
+
+    if (clearToWhite) {
+        fContext->getGpu()->clear(NULL, SK_ColorWHITE);
+    } else {
+        fContext->getGpu()->clear(NULL, 0x00000000);
+    }
+
+    texture->writePixels(0, 0, fBM.width(), fBM.height(), 
+                         kAlpha_8_GrPixelConfig,
+                         fBM.getPixels(), fBM.rowBytes());
+}
+
diff --git a/src/gpu/GrSWMaskHelper.h b/src/gpu/GrSWMaskHelper.h
new file mode 100644
index 0000000000..b789f99131
--- /dev/null
+++ b/src/gpu/GrSWMaskHelper.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrSWMaskHelper_DEFINED
+#define GrSWMaskHelper_DEFINED
+
+#include "GrColor.h"
+#include "GrMatrix.h"
+#include "GrNoncopyable.h"
+#include "SkBitmap.h"
+#include "SkDraw.h"
+#include "SkRasterClip.h"
+#include "SkRegion.h"
+
+class GrAutoScratchTexture;
+class GrContext;
+class GrTexture;
+class SkPath;
+
+/**
+ * The GrSWMaskHelper helps generate clip masks using the software rendering
+ * path.
+ */
+class GrSWMaskHelper : public GrNoncopyable {
+public:
+    GrSWMaskHelper(GrContext* context) 
+    : fContext(context) {
+    }
+
+    void draw(const GrRect& clientRect, SkRegion::Op op, 
+              bool antiAlias, GrColor color);
+
+    void draw(const SkPath& clientPath, SkRegion::Op op, 
+              GrPathFill fill, bool antiAlias, GrColor color);
+
+    bool init(const GrIRect& pathDevBounds, 
+              const GrPoint* translate,
+              bool useMatrix);
+
+    bool getTexture(GrAutoScratchTexture* tex);
+
+    void toTexture(GrTexture* texture, bool clearToWhite);
+
+    void clear(GrColor color) {
+        fBM.eraseColor(color);
+    }
+
+protected:
+private:
+    GrContext*      fContext;
+    GrMatrix        fMatrix;
+    SkBitmap        fBM;
+    SkDraw          fDraw;
+    SkRasterClip    fRasterClip;
+
+    typedef GrNoncopyable INHERITED;
+};
+
+#endif GrSWMaskHelper_DEFINED
diff --git a/src/gpu/GrSoftwarePathRenderer.cpp b/src/gpu/GrSoftwarePathRenderer.cpp
index 5e4f6f1735..2566a53db6 100644
--- a/src/gpu/GrSoftwarePathRenderer.cpp
+++ b/src/gpu/GrSoftwarePathRenderer.cpp
@@ -7,13 +7,8 @@
  */
 
 #include "GrSoftwarePathRenderer.h"
-#include "GrPaint.h"
-#include "SkPaint.h"
-#include "GrRenderTarget.h" 
 #include "GrContext.h"
-#include "SkDraw.h"
-#include "SkRasterClip.h"
-#include "GrGpu.h"
+#include "GrSWMaskHelper.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 bool GrSoftwarePathRenderer::canDrawPath(const SkPath& path,
@@ -36,23 +31,6 @@ bool GrSoftwarePathRenderer::canDrawPath(const SkPath& path,
 namespace {
 
 ////////////////////////////////////////////////////////////////////////////////
-SkPath::FillType gr_fill_to_sk_fill(GrPathFill fill) {
-    switch (fill) {
-        case kWinding_GrPathFill:
-            return SkPath::kWinding_FillType;
-        case kEvenOdd_GrPathFill:
-            return SkPath::kEvenOdd_FillType;
-        case kInverseWinding_GrPathFill:
-            return SkPath::kInverseWinding_FillType;
-        case kInverseEvenOdd_GrPathFill:
-            return SkPath::kInverseEvenOdd_FillType;
-        default:
-            GrCrash("Unexpected fill.");
-            return SkPath::kWinding_FillType;
-    }
-}
-
-////////////////////////////////////////////////////////////////////////////////
 // gets device coord bounds of path (not considering the fill) and clip. The
 // path bounds will be a subset of the clip bounds. returns false if 
 // path bounds would be empty.
@@ -98,157 +76,6 @@ bool get_path_and_clip_bounds(const GrDrawTarget* target,
     return true;
 }
 
-
-/*
- * Convert a boolean operation into a transfer mode code
- */
-SkXfermode::Mode op_to_mode(SkRegion::Op op) {
-
-    static const SkXfermode::Mode modeMap[] = {
-        SkXfermode::kDstOut_Mode,   // kDifference_Op
-        SkXfermode::kMultiply_Mode, // kIntersect_Op
-        SkXfermode::kSrcOver_Mode,  // kUnion_Op
-        SkXfermode::kXor_Mode,      // kXOR_Op
-        SkXfermode::kClear_Mode,    // kReverseDifference_Op
-        SkXfermode::kSrc_Mode,      // kReplace_Op
-    };
-
-    return modeMap[op];
-}
-
-}
-
-/**
- * Draw a single rect element of the clip stack into the accumulation bitmap
- */
-void GrSWMaskHelper::draw(const GrRect& clientRect, SkRegion::Op op, 
-                          bool antiAlias, GrColor color) {
-    SkPaint paint;
-
-    SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
-
-    paint.setXfermode(mode);
-    paint.setAntiAlias(antiAlias);
-    paint.setColor(color);
-
-    fDraw.drawRect(clientRect, paint);
-
-    SkSafeUnref(mode);
-}
-
-/**
- * Draw a single path element of the clip stack into the accumulation bitmap
- */
-void GrSWMaskHelper::draw(const SkPath& clientPath, SkRegion::Op op,
-                          GrPathFill fill, bool antiAlias, GrColor color) {
-
-    SkPaint paint;
-    SkPath tmpPath;
-    const SkPath* pathToDraw = &clientPath;
-    if (kHairLine_GrPathFill == fill) {
-        paint.setStyle(SkPaint::kStroke_Style);
-        paint.setStrokeWidth(SK_Scalar1);
-    } else {
-        paint.setStyle(SkPaint::kFill_Style);
-        SkPath::FillType skfill = gr_fill_to_sk_fill(fill);
-        if (skfill != pathToDraw->getFillType()) {
-            tmpPath = *pathToDraw;
-            tmpPath.setFillType(skfill);
-            pathToDraw = &tmpPath;
-        }
-    }
-    SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
-
-    paint.setXfermode(mode);
-    paint.setAntiAlias(antiAlias);
-    paint.setColor(color);
-
-    fDraw.drawPath(*pathToDraw, paint);
-
-    SkSafeUnref(mode);
-}
-
-bool GrSWMaskHelper::init(const GrIRect& pathDevBounds, 
-                          const GrPoint* translate,
-                          bool useMatrix) {
-    if (useMatrix) {    
-        fMatrix = fContext->getMatrix();
-    } else {
-        fMatrix.setIdentity();
-    }
-
-    if (NULL != translate) {
-        fMatrix.postTranslate(translate->fX, translate->fY);
-    }
-
-    fMatrix.postTranslate(-pathDevBounds.fLeft * SK_Scalar1,
-                          -pathDevBounds.fTop * SK_Scalar1);
-    GrIRect bounds = GrIRect::MakeWH(pathDevBounds.width(),
-                                     pathDevBounds.height());
-
-    fBM.setConfig(SkBitmap::kA8_Config, bounds.fRight, bounds.fBottom);
-    if (!fBM.allocPixels()) {
-        return false;
-    }
-    sk_bzero(fBM.getPixels(), fBM.getSafeSize());
-
-    sk_bzero(&fDraw, sizeof(fDraw));
-    fRasterClip.setRect(bounds);
-    fDraw.fRC    = &fRasterClip;
-    fDraw.fClip  = &fRasterClip.bwRgn();
-    fDraw.fMatrix = &fMatrix;
-    fDraw.fBitmap = &fBM;
-    return true;
-}
-
-/**
- * Get a texture (from the texture cache) of the correct size & format
- */
-bool GrSWMaskHelper::getTexture(GrAutoScratchTexture* tex) {
-    GrTextureDesc desc;
-    desc.fWidth = fBM.width();
-    desc.fHeight = fBM.height();
-    desc.fConfig = kAlpha_8_GrPixelConfig;
-
-    tex->set(fContext, desc);
-    GrTexture* texture = tex->texture();
-
-    if (NULL == texture) {
-        return false;
-    }
-
-    return true;
-}
-
-/**
- * Move the result of the software mask generation back to the gpu
- */
-void GrSWMaskHelper::toTexture(GrTexture *texture, bool clearToWhite) {
-    SkAutoLockPixels alp(fBM);
-
-    // The destination texture is almost always larger than "fBM". Clear
-    // it appropriately so we don't get mask artifacts outside of the path's
-    // bounding box
-    
-    // "texture" needs to be installed as the render target for the clear
-    // and the texture upload but cannot remain the render target upon
-    // returned. Callers typically use it as a texture and it would then
-    // be both source and dest.
-    GrDrawState::AutoRenderTargetRestore artr(fContext->getGpu()->drawState(), 
-                                              texture->asRenderTarget());
-
-    if (clearToWhite) {
-        fContext->getGpu()->clear(NULL, SK_ColorWHITE);
-    } else {
-        fContext->getGpu()->clear(NULL, 0x00000000);
-    }
-
-    texture->writePixels(0, 0, fBM.width(), fBM.height(), 
-                         kAlpha_8_GrPixelConfig,
-                         fBM.getPixels(), fBM.rowBytes());
-}
-
-namespace {
 ////////////////////////////////////////////////////////////////////////////////
 /**
  * sw rasterizes path to A8 mask using the context's matrix and uploads to a 
diff --git a/src/gpu/GrSoftwarePathRenderer.h b/src/gpu/GrSoftwarePathRenderer.h
index cb84506d27..a42090cbe7 100644
--- a/src/gpu/GrSoftwarePathRenderer.h
+++ b/src/gpu/GrSoftwarePathRenderer.h
@@ -11,53 +11,10 @@
 
 #include "GrPathRenderer.h"
 
-#include "SkDraw.h"
-#include "SkRasterClip.h"
-
 class GrContext;
 class GrAutoScratchTexture;
 
 /**
- * The GrSWMaskHelper helps generate clip masks using the software rendering
- * path.
- */
-class GrSWMaskHelper : public GrNoncopyable {
-public:
-    GrSWMaskHelper(GrContext* context) 
-    : fContext(context) {
-
-    }
-
-    void draw(const GrRect& clientRect, SkRegion::Op op, 
-              bool antiAlias, GrColor color);
-
-    void draw(const SkPath& clientPath, SkRegion::Op op, 
-              GrPathFill fill, bool antiAlias, GrColor color);
-
-    bool init(const GrIRect& pathDevBounds, 
-              const GrPoint* translate,
-              bool useMatrix);
-
-    bool getTexture(GrAutoScratchTexture* tex);
-
-    void toTexture(GrTexture* texture, bool clearToWhite);
-
-    void clear(GrColor color) {
-        fBM.eraseColor(color);
-    }
-
-protected:
-private:
-    GrContext*      fContext;
-    GrMatrix        fMatrix;
-    SkBitmap        fBM;
-    SkDraw          fDraw;
-    SkRasterClip    fRasterClip;
-
-    typedef GrPathRenderer INHERITED;
-};
-
-/**
  * This class uses the software side to render a path to an SkBitmap and
  * then uploads the result to the gpu
  */