Revert of Initial picture shader implementation

src/core/SkPictureShader.cpp

-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkPictureShader.h"
-
-#include "SkBitmap.h"
-#include "SkBitmapProcShader.h"
-#include "SkCanvas.h"
-#include "SkMatrixUtils.h"
-#include "SkPicture.h"
-#include "SkReadBuffer.h"
-
-#if SK_SUPPORT_GPU
-#include "GrContext.h"
-#endif
-
-SkPictureShader::SkPictureShader(SkPicture* picture, TileMode tmx, TileMode tmy)
-    : fPicture(picture)
-    , fTmx(tmx)
-    , fTmy(tmy) {
-    SkSafeRef(fPicture);
-}
-
-SkPictureShader::SkPictureShader(SkReadBuffer& buffer)
-        : INHERITED(buffer) {
-    fTmx = static_cast<SkShader::TileMode>(buffer.read32());
-    fTmy = static_cast<SkShader::TileMode>(buffer.read32());
-    if (buffer.readBool()) {
-        fPicture = SkPicture::CreateFromBuffer(buffer);
-    } else {
-        fPicture = NULL;
-    }
-}
-
-SkPictureShader::~SkPictureShader() {
-    SkSafeUnref(fPicture);
-}
-
-SkPictureShader* SkPictureShader::Create(SkPicture* picture, TileMode tmx, TileMode tmy) {
-    return SkNEW_ARGS(SkPictureShader, (picture, tmx, tmy));
-}
-
-void SkPictureShader::flatten(SkWriteBuffer& buffer) const {
-    this->INHERITED::flatten(buffer);
-
-    buffer.write32(fTmx);
-    buffer.write32(fTmy);
-    buffer.writeBool(NULL != fPicture);
-    if (fPicture) {
-        fPicture->flatten(buffer);
-    }
-}
-
-bool SkPictureShader::buildBitmapShader(const SkMatrix& matrix) const {
-    if (!fPicture || (0 == fPicture->width() && 0 == fPicture->height())) {
-        return false;
-    }
-
-    SkMatrix m;
-    if (this->hasLocalMatrix()) {
-        m.setConcat(matrix, this->getLocalMatrix());
-    } else {
-        m = matrix;
-    }
-
-    // Use a rotation-invariant scale
-    SkPoint scale;
-    if (!SkDecomposeUpper2x2(m, NULL, &scale, NULL)) {
-        // Decomposition failed, use an approximation.
-        scale.set(SkScalarSqrt(m.getScaleX() * m.getScaleX() + m.getSkewX() * m.getSkewX()),
-                  SkScalarSqrt(m.getScaleY() * m.getScaleY() + m.getSkewY() * m.getSkewY()));
-    }
-    SkSize scaledSize = SkSize::Make(scale.x() * fPicture->width(), scale.y() * fPicture->height());
-
-    SkISize tileSize = scaledSize.toRound();
-    if (tileSize.isEmpty()) {
-        return false;
-    }
-
-    // The actual scale, compensating for rounding.
-    SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fPicture->width(),
-                                    SkIntToScalar(tileSize.height()) / fPicture->height());
-
-    if (!fCachedShader || tileScale != fCachedTileScale) {
-        SkBitmap bm;
-        if (!bm.allocN32Pixels(tileSize.width(), tileSize.height())) {
-            return false;
-        }
-        bm.eraseColor(SK_ColorTRANSPARENT);
-
-        SkCanvas canvas(bm);
-        canvas.scale(tileScale.width(), tileScale.height());
-        canvas.drawPicture(*fPicture);
-
-        fCachedShader.reset(CreateBitmapShader(bm, fTmx, fTmy));
-        fCachedTileScale = tileScale;
-    }
-
-    SkMatrix shaderMatrix = this->getLocalMatrix();
-    shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height());
-    fCachedShader->setLocalMatrix(shaderMatrix);
-
-    return true;
-}
-
-bool SkPictureShader::setContext(const SkBitmap& device,
-                                 const SkPaint& paint,
-                                 const SkMatrix& matrix) {
-    if (!this->buildBitmapShader(matrix)) {
-        return false;
-    }
-
-    if (!this->INHERITED::setContext(device, paint, matrix)) {
-        return false;
-    }
-
-    SkASSERT(fCachedShader);
-    if (!fCachedShader->setContext(device, paint, matrix)) {
-        this->INHERITED::endContext();
-        return false;
-    }
-
-    return true;
-}
-
-void SkPictureShader::endContext() {
-    SkASSERT(fCachedShader);
-    fCachedShader->endContext();
-
-    this->INHERITED::endContext();
-}
-
-uint32_t SkPictureShader::getFlags() {
-    if (NULL != fCachedShader) {
-        return fCachedShader->getFlags();
-    }
-    return 0;
-}
-
-SkShader::ShadeProc SkPictureShader::asAShadeProc(void** ctx) {
-    if (fCachedShader) {
-        return fCachedShader->asAShadeProc(ctx);
-    }
-    return NULL;
-}
-
-void SkPictureShader::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
-    SkASSERT(fCachedShader);
-    fCachedShader->shadeSpan(x, y, dstC, count);
-}
-
-void SkPictureShader::shadeSpan16(int x, int y, uint16_t dstC[], int count) {
-    SkASSERT(fCachedShader);
-    fCachedShader->shadeSpan16(x, y, dstC, count);
-}
-
-#ifndef SK_IGNORE_TO_STRING
-void SkPictureShader::toString(SkString* str) const {
-    static const char* gTileModeName[SkShader::kTileModeCount] = {
-        "clamp", "repeat", "mirror"
-    };
-
-    str->appendf("PictureShader: [%d:%d] ",
-                 fPicture ? fPicture->width() : 0,
-                 fPicture ? fPicture->height() : 0);
-
-    str->appendf("(%s, %s)", gTileModeName[fTmx], gTileModeName[fTmy]);
-
-    this->INHERITED::toString(str);
-}
-#endif
-
-#if SK_SUPPORT_GPU
-GrEffectRef* SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint) const {
-    if (!this->buildBitmapShader(context->getMatrix())) {
-        return NULL;
-    }
-    SkASSERT(fCachedShader);
-    return fCachedShader->asNewEffect(context, paint);
-}
-#endif