Extract most of the mutable state of SkShader into a separate Context object.

src/core/SkCanvas.cpp

 
 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkCanvas.h"
@@ skipping 73 matching lines @@
         const int count = fPixelRef ? fPixelRef->getLockCount() : 0;
         SkASSERT(count == fLockCount);
     }
 
 private:
     const SkPixelRef* fPixelRef;
     int               fLockCount;
 };
 #endif
 
-class AutoCheckNoSetContext {
-public:
-    AutoCheckNoSetContext(const SkPaint& paint) : fPaint(paint) {
-        this->assertNoSetContext(fPaint);
-    }
-    ~AutoCheckNoSetContext() {
-        this->assertNoSetContext(fPaint);
-    }
-
-private:
-    const SkPaint& fPaint;
-
-    void assertNoSetContext(const SkPaint& paint) {
-        SkShader* s = paint.getShader();
-        if (s) {
-            SkASSERT(!s->setContextHasBeenCalled());
-        }
-    }
-};
-
 #define CHECK_LOCKCOUNT_BALANCE(bitmap)  AutoCheckLockCountBalance clcb(bitmap)
-#define CHECK_SHADER_NOSETCONTEXT(paint) AutoCheckNoSetContext     cshsc(paint)
 
 #else
     #define CHECK_LOCKCOUNT_BALANCE(bitmap)
-    #define CHECK_SHADER_NOSETCONTEXT(paint)
 #endif
 
 typedef SkTLazy<SkPaint> SkLazyPaint;
 
 void SkCanvas::predrawNotify() {
     if (fSurfaceBase) {
         fSurfaceBase->aboutToDraw(SkSurface::kRetain_ContentChangeMode);
     }
 }
 
@@ skipping 1798 matching lines @@
     if (NULL != fSurfaceBase) {
         fSurfaceBase->aboutToDraw(SkSurface::kDiscard_ContentChangeMode);
     }
 }
 
 void SkCanvas::drawPaint(const SkPaint& paint) {
     this->internalDrawPaint(paint);
 }
 
 void SkCanvas::internalDrawPaint(const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     LOOPER_BEGIN(paint, SkDrawFilter::kPaint_Type, NULL)
 
     while (iter.next()) {
         iter.fDevice->drawPaint(iter, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawPoints(PointMode mode, size_t count, const SkPoint pts[],
                           const SkPaint& paint) {
     if ((long)count <= 0) {
         return;
     }
 
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     SkRect r, storage;
     const SkRect* bounds = NULL;
     if (paint.canComputeFastBounds()) {
         // special-case 2 points (common for drawing a single line)
         if (2 == count) {
             r.set(pts[0], pts[1]);
         } else {
             r.set(pts, SkToInt(count));
         }
         bounds = &paint.computeFastStrokeBounds(r, &storage);
         if (this->quickReject(*bounds)) {
             return;
         }
     }
 
     SkASSERT(pts != NULL);
 
     LOOPER_BEGIN(paint, SkDrawFilter::kPoint_Type, bounds)
 
     while (iter.next()) {
         iter.fDevice->drawPoints(iter, mode, count, pts, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawRect(const SkRect& r, const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     SkRect storage;
     const SkRect* bounds = NULL;
     if (paint.canComputeFastBounds()) {
         bounds = &paint.computeFastBounds(r, &storage);
         if (this->quickReject(*bounds)) {
             return;
         }
     }
 
     LOOPER_BEGIN(paint, SkDrawFilter::kRect_Type, bounds)
 
     while (iter.next()) {
         iter.fDevice->drawRect(iter, r, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawOval(const SkRect& oval, const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     SkRect storage;
     const SkRect* bounds = NULL;
     if (paint.canComputeFastBounds()) {
         bounds = &paint.computeFastBounds(oval, &storage);
         if (this->quickReject(*bounds)) {
             return;
         }
     }
 
     LOOPER_BEGIN(paint, SkDrawFilter::kOval_Type, bounds)
 
     while (iter.next()) {
         iter.fDevice->drawOval(iter, oval, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     SkRect storage;
     const SkRect* bounds = NULL;
     if (paint.canComputeFastBounds()) {
         bounds = &paint.computeFastBounds(rrect.getBounds(), &storage);
         if (this->quickReject(*bounds)) {
             return;
         }
     }
 
     if (rrect.isRect()) {
@@ skipping 10 matching lines @@
 
     while (iter.next()) {
         iter.fDevice->drawRRect(iter, rrect, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
                             const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     SkRect storage;
     const SkRect* bounds = NULL;
     if (paint.canComputeFastBounds()) {
         bounds = &paint.computeFastBounds(outer.getBounds(), &storage);
         if (this->quickReject(*bounds)) {
             return;
         }
     }
 
     LOOPER_BEGIN(paint, SkDrawFilter::kRRect_Type, bounds)
 
     while (iter.next()) {
         iter.fDevice->drawDRRect(iter, outer, inner, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawPath(const SkPath& path, const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     if (!path.isFinite()) {
         return;
     }
 
     SkRect storage;
     const SkRect* bounds = NULL;
     if (!path.isInverseFillType() && paint.canComputeFastBounds()) {
         const SkRect& pathBounds = path.getBounds();
         bounds = &paint.computeFastBounds(pathBounds, &storage);
         if (this->quickReject(*bounds)) {
@@ skipping 255 matching lines @@
                                              start.fY);
             r.fTop = offset;
             r.fBottom = offset + height;
             DrawRect(draw, paint, r, textSize);
         }
     }
 }
 
 void SkCanvas::drawText(const void* text, size_t byteLength,
                         SkScalar x, SkScalar y, const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
     while (iter.next()) {
         SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint());
         iter.fDevice->drawText(iter, text, byteLength, x, y, dfp.paint());
         DrawTextDecorations(iter, dfp.paint(),
                             static_cast<const char*>(text), byteLength, x, y);
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawPosText(const void* text, size_t byteLength,
                            const SkPoint pos[], const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
     while (iter.next()) {
         SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint());
         iter.fDevice->drawPosText(iter, text, byteLength, &pos->fX, 0, 2,
                                   dfp.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawPosTextH(const void* text, size_t byteLength,
                             const SkScalar xpos[], SkScalar constY,
                             const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
     while (iter.next()) {
         SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint());
         iter.fDevice->drawPosText(iter, text, byteLength, xpos, constY, 1,
                                   dfp.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawTextOnPath(const void* text, size_t byteLength,
                               const SkPath& path, const SkMatrix* matrix,
                               const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
     while (iter.next()) {
         iter.fDevice->drawTextOnPath(iter, text, byteLength, path,
                                      matrix, looper.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::drawVertices(VertexMode vmode, int vertexCount,
                             const SkPoint verts[], const SkPoint texs[],
                             const SkColor colors[], SkXfermode* xmode,
                             const uint16_t indices[], int indexCount,
                             const SkPaint& paint) {
-    CHECK_SHADER_NOSETCONTEXT(paint);
-
     LOOPER_BEGIN(paint, SkDrawFilter::kPath_Type, NULL)
 
     while (iter.next()) {
         iter.fDevice->drawVertices(iter, vmode, vertexCount, verts, texs,
                                    colors, xmode, indices, indexCount,
                                    looper.paint());
     }
 
     LOOPER_END
 }
@@ skipping 234 matching lines @@
     if (!bitmap.installPixels(info, pixels, rowBytes)) {
         return NULL;
     }
 
     // should this functionality be moved into allocPixels()?
     if (!bitmap.info().isOpaque()) {
         bitmap.eraseColor(0);
     }
     return SkNEW_ARGS(SkCanvas, (bitmap));
 }