| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Canvas.h" |
| |
| #include <SkCanvas.h> |
| #include <SkClipStack.h> |
| #include <SkDevice.h> |
| #include <SkDeque.h> |
| #include <SkDrawFilter.h> |
| #include <SkGraphics.h> |
| #include <SkShader.h> |
| #include <SkTArray.h> |
| #include <SkTemplates.h> |
| |
| namespace android { |
| |
| // Holds an SkCanvas reference plus additional native data. |
| class SkiaCanvas : public Canvas { |
| public: |
| explicit SkiaCanvas(const SkBitmap& bitmap); |
| |
| /** |
| * Create a new SkiaCanvas. |
| * |
| * @param canvas SkCanvas to handle calls made to this SkiaCanvas. Must |
| * not be NULL. This constructor will ref() the SkCanvas, and unref() |
| * it in its destructor. |
| */ |
| explicit SkiaCanvas(SkCanvas* canvas) : mCanvas(canvas) { |
| SkASSERT(canvas); |
| canvas->ref(); |
| } |
| |
| virtual SkCanvas* asSkCanvas() override { |
| return mCanvas.get(); |
| } |
| |
| virtual void setBitmap(const SkBitmap& bitmap) override; |
| |
| virtual bool isOpaque() override; |
| virtual int width() override; |
| virtual int height() override; |
| |
| virtual int getSaveCount() const override; |
| virtual int save(SkCanvas::SaveFlags flags) override; |
| virtual void restore() override; |
| virtual void restoreToCount(int saveCount) override; |
| |
| virtual int saveLayer(float left, float top, float right, float bottom, |
| const SkPaint* paint, SkCanvas::SaveFlags flags) override; |
| virtual int saveLayerAlpha(float left, float top, float right, float bottom, |
| int alpha, SkCanvas::SaveFlags flags) override; |
| |
| virtual void getMatrix(SkMatrix* outMatrix) const override; |
| virtual void setMatrix(const SkMatrix& matrix) override; |
| virtual void setLocalMatrix(const SkMatrix& matrix) override { this->setMatrix(matrix); } |
| virtual void concat(const SkMatrix& matrix) override; |
| virtual void rotate(float degrees) override; |
| virtual void scale(float sx, float sy) override; |
| virtual void skew(float sx, float sy) override; |
| virtual void translate(float dx, float dy) override; |
| |
| virtual bool getClipBounds(SkRect* outRect) const override; |
| virtual bool quickRejectRect(float left, float top, float right, float bottom) const override; |
| virtual bool quickRejectPath(const SkPath& path) const override; |
| virtual bool clipRect(float left, float top, float right, float bottom, |
| SkRegion::Op op) override; |
| virtual bool clipPath(const SkPath* path, SkRegion::Op op) override; |
| virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) override; |
| |
| virtual SkDrawFilter* getDrawFilter() override; |
| virtual void setDrawFilter(SkDrawFilter* drawFilter) override; |
| |
| virtual void drawColor(int color, SkXfermode::Mode mode) override; |
| virtual void drawPaint(const SkPaint& paint) override; |
| |
| virtual void drawPoint(float x, float y, const SkPaint& paint) override; |
| virtual void drawPoints(const float* points, int count, const SkPaint& paint) override; |
| virtual void drawLine(float startX, float startY, float stopX, float stopY, |
| const SkPaint& paint) override; |
| virtual void drawLines(const float* points, int count, const SkPaint& paint) override; |
| virtual void drawRect(float left, float top, float right, float bottom, |
| const SkPaint& paint) override; |
| virtual void drawRoundRect(float left, float top, float right, float bottom, |
| float rx, float ry, const SkPaint& paint) override; |
| virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) override; |
| virtual void drawOval(float left, float top, float right, float bottom, |
| const SkPaint& paint) override; |
| virtual void drawArc(float left, float top, float right, float bottom, |
| float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override; |
| virtual void drawPath(const SkPath& path, const SkPaint& paint) override; |
| virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, |
| const float* verts, const float* tex, const int* colors, |
| const uint16_t* indices, int indexCount, const SkPaint& paint) override; |
| |
| virtual void drawBitmap(const SkBitmap& bitmap, float left, float top, |
| const SkPaint* paint) override; |
| virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, |
| const SkPaint* paint) override; |
| virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, |
| float srcRight, float srcBottom, float dstLeft, float dstTop, |
| float dstRight, float dstBottom, const SkPaint* paint) override; |
| virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, |
| const float* vertices, const int* colors, const SkPaint* paint) override; |
| |
| virtual void drawText(const uint16_t* text, const float* positions, int count, |
| const SkPaint& paint, float x, float y, |
| float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, |
| float totalAdvance) override; |
| virtual void drawPosText(const uint16_t* text, const float* positions, int count, |
| int posCount, const SkPaint& paint) override; |
| virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, |
| float hOffset, float vOffset, const SkPaint& paint) override; |
| |
| virtual bool drawTextAbsolutePos() const override { return true; } |
| |
| private: |
| struct SaveRec { |
| int saveCount; |
| SkCanvas::SaveFlags saveFlags; |
| }; |
| |
| void recordPartialSave(SkCanvas::SaveFlags flags); |
| void saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount); |
| void applyClips(const SkTArray<SkClipStack::Element>& clips); |
| |
| void drawPoints(const float* points, int count, const SkPaint& paint, |
| SkCanvas::PointMode mode); |
| void drawTextDecorations(float x, float y, float length, const SkPaint& paint); |
| |
| SkAutoTUnref<SkCanvas> mCanvas; |
| SkAutoTDelete<SkDeque> mSaveStack; // lazily allocated, tracks partial saves. |
| }; |
| |
| Canvas* Canvas::create_canvas(const SkBitmap& bitmap) { |
| return new SkiaCanvas(bitmap); |
| } |
| |
| Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) { |
| return new SkiaCanvas(skiaCanvas); |
| } |
| |
| SkiaCanvas::SkiaCanvas(const SkBitmap& bitmap) { |
| mCanvas.reset(new SkCanvas(bitmap)); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas state operations: Replace Bitmap |
| // ---------------------------------------------------------------------------- |
| |
| class ClipCopier : public SkCanvas::ClipVisitor { |
| public: |
| ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {} |
| |
| virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) { |
| m_dstCanvas->clipRect(rect, op, antialias); |
| } |
| virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) { |
| m_dstCanvas->clipRRect(rrect, op, antialias); |
| } |
| virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) { |
| m_dstCanvas->clipPath(path, op, antialias); |
| } |
| |
| private: |
| SkCanvas* m_dstCanvas; |
| }; |
| |
| void SkiaCanvas::setBitmap(const SkBitmap& bitmap) { |
| SkCanvas* newCanvas = new SkCanvas(bitmap); |
| SkASSERT(newCanvas); |
| |
| if (!bitmap.isNull()) { |
| // Copy the canvas matrix & clip state. |
| newCanvas->setMatrix(mCanvas->getTotalMatrix()); |
| if (NULL != mCanvas->getDevice() && NULL != newCanvas->getDevice()) { |
| ClipCopier copier(newCanvas); |
| mCanvas->replayClips(&copier); |
| } |
| } |
| |
| // unrefs the existing canvas |
| mCanvas.reset(newCanvas); |
| |
| // clean up the old save stack |
| mSaveStack.reset(NULL); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas state operations |
| // ---------------------------------------------------------------------------- |
| |
| bool SkiaCanvas::isOpaque() { |
| return mCanvas->getDevice()->accessBitmap(false).isOpaque(); |
| } |
| |
| int SkiaCanvas::width() { |
| return mCanvas->getBaseLayerSize().width(); |
| } |
| |
| int SkiaCanvas::height() { |
| return mCanvas->getBaseLayerSize().height(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas state operations: Save (layer) |
| // ---------------------------------------------------------------------------- |
| |
| int SkiaCanvas::getSaveCount() const { |
| return mCanvas->getSaveCount(); |
| } |
| |
| int SkiaCanvas::save(SkCanvas::SaveFlags flags) { |
| int count = mCanvas->save(); |
| recordPartialSave(flags); |
| return count; |
| } |
| |
| void SkiaCanvas::restore() { |
| const SaveRec* rec = (NULL == mSaveStack.get()) |
| ? NULL |
| : static_cast<SaveRec*>(mSaveStack->back()); |
| int currentSaveCount = mCanvas->getSaveCount() - 1; |
| SkASSERT(NULL == rec || currentSaveCount >= rec->saveCount); |
| |
| if (NULL == rec || rec->saveCount != currentSaveCount) { |
| // Fast path - no record for this frame. |
| mCanvas->restore(); |
| return; |
| } |
| |
| bool preserveMatrix = !(rec->saveFlags & SkCanvas::kMatrix_SaveFlag); |
| bool preserveClip = !(rec->saveFlags & SkCanvas::kClip_SaveFlag); |
| |
| SkMatrix savedMatrix; |
| if (preserveMatrix) { |
| savedMatrix = mCanvas->getTotalMatrix(); |
| } |
| |
| SkTArray<SkClipStack::Element> savedClips; |
| if (preserveClip) { |
| saveClipsForFrame(savedClips, currentSaveCount); |
| } |
| |
| mCanvas->restore(); |
| |
| if (preserveMatrix) { |
| mCanvas->setMatrix(savedMatrix); |
| } |
| |
| if (preserveClip && !savedClips.empty()) { |
| applyClips(savedClips); |
| } |
| |
| mSaveStack->pop_back(); |
| } |
| |
| void SkiaCanvas::restoreToCount(int restoreCount) { |
| while (mCanvas->getSaveCount() > restoreCount) { |
| this->restore(); |
| } |
| } |
| |
| int SkiaCanvas::saveLayer(float left, float top, float right, float bottom, |
| const SkPaint* paint, SkCanvas::SaveFlags flags) { |
| SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); |
| int count = mCanvas->saveLayer(&bounds, paint, flags | SkCanvas::kMatrixClip_SaveFlag); |
| recordPartialSave(flags); |
| return count; |
| } |
| |
| int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom, |
| int alpha, SkCanvas::SaveFlags flags) { |
| SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); |
| int count = mCanvas->saveLayerAlpha(&bounds, alpha, flags | SkCanvas::kMatrixClip_SaveFlag); |
| recordPartialSave(flags); |
| return count; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags) |
| // ---------------------------------------------------------------------------- |
| |
| void SkiaCanvas::recordPartialSave(SkCanvas::SaveFlags flags) { |
| // A partial save is a save operation which doesn't capture the full canvas state. |
| // (either kMatrix_SaveFlags or kClip_SaveFlag is missing). |
| |
| // Mask-out non canvas state bits. |
| flags = static_cast<SkCanvas::SaveFlags>(flags & SkCanvas::kMatrixClip_SaveFlag); |
| |
| if (SkCanvas::kMatrixClip_SaveFlag == flags) { |
| // not a partial save. |
| return; |
| } |
| |
| if (NULL == mSaveStack.get()) { |
| mSaveStack.reset(SkNEW_ARGS(SkDeque, (sizeof(struct SaveRec), 8))); |
| } |
| |
| SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back()); |
| // Store the save counter in the SkClipStack domain. |
| // (0-based, equal to the number of save ops on the stack). |
| rec->saveCount = mCanvas->getSaveCount() - 1; |
| rec->saveFlags = flags; |
| } |
| |
| void SkiaCanvas::saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount) { |
| SkClipStack::Iter clipIterator(*mCanvas->getClipStack(), |
| SkClipStack::Iter::kTop_IterStart); |
| while (const SkClipStack::Element* elem = clipIterator.next()) { |
| if (elem->getSaveCount() < frameSaveCount) { |
| // done with the current frame. |
| break; |
| } |
| SkASSERT(elem->getSaveCount() == frameSaveCount); |
| clips.push_back(*elem); |
| } |
| } |
| |
| void SkiaCanvas::applyClips(const SkTArray<SkClipStack::Element>& clips) { |
| ClipCopier clipCopier(mCanvas); |
| |
| // The clip stack stores clips in device space. |
| SkMatrix origMatrix = mCanvas->getTotalMatrix(); |
| mCanvas->resetMatrix(); |
| |
| // We pushed the clips in reverse order. |
| for (int i = clips.count() - 1; i >= 0; --i) { |
| clips[i].replay(&clipCopier); |
| } |
| |
| mCanvas->setMatrix(origMatrix); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas state operations: Matrix |
| // ---------------------------------------------------------------------------- |
| |
| void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const { |
| *outMatrix = mCanvas->getTotalMatrix(); |
| } |
| |
| void SkiaCanvas::setMatrix(const SkMatrix& matrix) { |
| mCanvas->setMatrix(matrix); |
| } |
| |
| void SkiaCanvas::concat(const SkMatrix& matrix) { |
| mCanvas->concat(matrix); |
| } |
| |
| void SkiaCanvas::rotate(float degrees) { |
| mCanvas->rotate(degrees); |
| } |
| |
| void SkiaCanvas::scale(float sx, float sy) { |
| mCanvas->scale(sx, sy); |
| } |
| |
| void SkiaCanvas::skew(float sx, float sy) { |
| mCanvas->skew(sx, sy); |
| } |
| |
| void SkiaCanvas::translate(float dx, float dy) { |
| mCanvas->translate(dx, dy); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas state operations: Clips |
| // ---------------------------------------------------------------------------- |
| |
| // This function is a mirror of SkCanvas::getClipBounds except that it does |
| // not outset the edge of the clip to account for anti-aliasing. There is |
| // a skia bug to investigate pushing this logic into back into skia. |
| // (see https://code.google.com/p/skia/issues/detail?id=1303) |
| bool SkiaCanvas::getClipBounds(SkRect* outRect) const { |
| SkIRect ibounds; |
| if (!mCanvas->getClipDeviceBounds(&ibounds)) { |
| return false; |
| } |
| |
| SkMatrix inverse; |
| // if we can't invert the CTM, we can't return local clip bounds |
| if (!mCanvas->getTotalMatrix().invert(&inverse)) { |
| if (outRect) { |
| outRect->setEmpty(); |
| } |
| return false; |
| } |
| |
| if (NULL != outRect) { |
| SkRect r = SkRect::Make(ibounds); |
| inverse.mapRect(outRect, r); |
| } |
| return true; |
| } |
| |
| bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const { |
| SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); |
| return mCanvas->quickReject(bounds); |
| } |
| |
| bool SkiaCanvas::quickRejectPath(const SkPath& path) const { |
| return mCanvas->quickReject(path); |
| } |
| |
| bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { |
| SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); |
| mCanvas->clipRect(rect, op); |
| return !mCanvas->isClipEmpty(); |
| } |
| |
| bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) { |
| mCanvas->clipPath(*path, op); |
| return !mCanvas->isClipEmpty(); |
| } |
| |
| bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) { |
| SkPath rgnPath; |
| if (region->getBoundaryPath(&rgnPath)) { |
| // The region is specified in device space. |
| SkMatrix savedMatrix = mCanvas->getTotalMatrix(); |
| mCanvas->resetMatrix(); |
| mCanvas->clipPath(rgnPath, op); |
| mCanvas->setMatrix(savedMatrix); |
| } else { |
| mCanvas->clipRect(SkRect::MakeEmpty(), op); |
| } |
| return !mCanvas->isClipEmpty(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas state operations: Filters |
| // ---------------------------------------------------------------------------- |
| |
| SkDrawFilter* SkiaCanvas::getDrawFilter() { |
| return mCanvas->getDrawFilter(); |
| } |
| |
| void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) { |
| mCanvas->setDrawFilter(drawFilter); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas draw operations |
| // ---------------------------------------------------------------------------- |
| |
| void SkiaCanvas::drawColor(int color, SkXfermode::Mode mode) { |
| mCanvas->drawColor(color, mode); |
| } |
| |
| void SkiaCanvas::drawPaint(const SkPaint& paint) { |
| mCanvas->drawPaint(paint); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas draw operations: Geometry |
| // ---------------------------------------------------------------------------- |
| |
| void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint, |
| SkCanvas::PointMode mode) { |
| // convert the floats into SkPoints |
| count >>= 1; // now it is the number of points |
| SkAutoSTMalloc<32, SkPoint> storage(count); |
| SkPoint* pts = storage.get(); |
| for (int i = 0; i < count; i++) { |
| pts[i].set(points[0], points[1]); |
| points += 2; |
| } |
| mCanvas->drawPoints(mode, count, pts, paint); |
| } |
| |
| |
| void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) { |
| mCanvas->drawPoint(x, y, paint); |
| } |
| |
| void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) { |
| this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode); |
| } |
| |
| void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY, |
| const SkPaint& paint) { |
| mCanvas->drawLine(startX, startY, stopX, stopY, paint); |
| } |
| |
| void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) { |
| this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode); |
| } |
| |
| void SkiaCanvas::drawRect(float left, float top, float right, float bottom, |
| const SkPaint& paint) { |
| mCanvas->drawRectCoords(left, top, right, bottom, paint); |
| |
| } |
| |
| void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom, |
| float rx, float ry, const SkPaint& paint) { |
| SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); |
| mCanvas->drawRoundRect(rect, rx, ry, paint); |
| } |
| |
| void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) { |
| mCanvas->drawCircle(x, y, radius, paint); |
| } |
| |
| void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) { |
| SkRect oval = SkRect::MakeLTRB(left, top, right, bottom); |
| mCanvas->drawOval(oval, paint); |
| } |
| |
| void SkiaCanvas::drawArc(float left, float top, float right, float bottom, |
| float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) { |
| SkRect arc = SkRect::MakeLTRB(left, top, right, bottom); |
| mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint); |
| } |
| |
| void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) { |
| mCanvas->drawPath(path, paint); |
| } |
| |
| void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, |
| const float* verts, const float* texs, const int* colors, |
| const uint16_t* indices, int indexCount, const SkPaint& paint) { |
| #ifndef SK_SCALAR_IS_FLOAT |
| SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); |
| #endif |
| const int ptCount = vertexCount >> 1; |
| mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs, |
| (SkColor*)colors, NULL, indices, indexCount, paint); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas draw operations: Bitmaps |
| // ---------------------------------------------------------------------------- |
| |
| void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) { |
| mCanvas->drawBitmap(bitmap, left, top, paint); |
| } |
| |
| void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) { |
| SkAutoCanvasRestore acr(mCanvas, true); |
| mCanvas->concat(matrix); |
| mCanvas->drawBitmap(bitmap, 0, 0, paint); |
| } |
| |
| void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, |
| float srcRight, float srcBottom, float dstLeft, float dstTop, |
| float dstRight, float dstBottom, const SkPaint* paint) { |
| SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom); |
| SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom); |
| mCanvas->drawBitmapRectToRect(bitmap, &srcRect, dstRect, paint); |
| } |
| |
| void SkiaCanvas::drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, |
| const float* vertices, const int* colors, const SkPaint* paint) { |
| |
| const int ptCount = (meshWidth + 1) * (meshHeight + 1); |
| const int indexCount = meshWidth * meshHeight * 6; |
| |
| /* Our temp storage holds 2 or 3 arrays. |
| texture points [ptCount * sizeof(SkPoint)] |
| optionally vertex points [ptCount * sizeof(SkPoint)] if we need a |
| copy to convert from float to fixed |
| indices [ptCount * sizeof(uint16_t)] |
| */ |
| ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[] |
| storageSize += indexCount * sizeof(uint16_t); // indices[] |
| |
| |
| #ifndef SK_SCALAR_IS_FLOAT |
| SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); |
| #endif |
| SkAutoMalloc storage(storageSize); |
| SkPoint* texs = (SkPoint*)storage.get(); |
| uint16_t* indices = (uint16_t*)(texs + ptCount); |
| |
| // cons up texture coordinates and indices |
| { |
| const SkScalar w = SkIntToScalar(bitmap.width()); |
| const SkScalar h = SkIntToScalar(bitmap.height()); |
| const SkScalar dx = w / meshWidth; |
| const SkScalar dy = h / meshHeight; |
| |
| SkPoint* texsPtr = texs; |
| SkScalar y = 0; |
| for (int i = 0; i <= meshHeight; i++) { |
| if (i == meshHeight) { |
| y = h; // to ensure numerically we hit h exactly |
| } |
| SkScalar x = 0; |
| for (int j = 0; j < meshWidth; j++) { |
| texsPtr->set(x, y); |
| texsPtr += 1; |
| x += dx; |
| } |
| texsPtr->set(w, y); |
| texsPtr += 1; |
| y += dy; |
| } |
| SkASSERT(texsPtr - texs == ptCount); |
| } |
| |
| // cons up indices |
| { |
| uint16_t* indexPtr = indices; |
| int index = 0; |
| for (int i = 0; i < meshHeight; i++) { |
| for (int j = 0; j < meshWidth; j++) { |
| // lower-left triangle |
| *indexPtr++ = index; |
| *indexPtr++ = index + meshWidth + 1; |
| *indexPtr++ = index + meshWidth + 2; |
| // upper-right triangle |
| *indexPtr++ = index; |
| *indexPtr++ = index + meshWidth + 2; |
| *indexPtr++ = index + 1; |
| // bump to the next cell |
| index += 1; |
| } |
| // bump to the next row |
| index += 1; |
| } |
| SkASSERT(indexPtr - indices == indexCount); |
| SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize); |
| } |
| |
| // double-check that we have legal indices |
| #ifdef SK_DEBUG |
| { |
| for (int i = 0; i < indexCount; i++) { |
| SkASSERT((unsigned)indices[i] < (unsigned)ptCount); |
| } |
| } |
| #endif |
| |
| // cons-up a shader for the bitmap |
| SkPaint tmpPaint; |
| if (paint) { |
| tmpPaint = *paint; |
| } |
| SkShader* shader = SkShader::CreateBitmapShader(bitmap, |
| SkShader::kClamp_TileMode, |
| SkShader::kClamp_TileMode); |
| SkSafeUnref(tmpPaint.setShader(shader)); |
| |
| mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices, |
| texs, (const SkColor*)colors, NULL, indices, |
| indexCount, tmpPaint); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Canvas draw operations: Text |
| // ---------------------------------------------------------------------------- |
| |
| void SkiaCanvas::drawText(const uint16_t* text, const float* positions, int count, |
| const SkPaint& paint, float x, float y, |
| float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, |
| float totalAdvance) { |
| // Set align to left for drawing, as we don't want individual |
| // glyphs centered or right-aligned; the offset above takes |
| // care of all alignment. |
| SkPaint paintCopy(paint); |
| paintCopy.setTextAlign(SkPaint::kLeft_Align); |
| |
| SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats); |
| mCanvas->drawPosText(text, count << 1, reinterpret_cast<const SkPoint*>(positions), paintCopy); |
| } |
| |
| void SkiaCanvas::drawPosText(const uint16_t* text, const float* positions, int count, int posCount, |
| const SkPaint& paint) { |
| SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL; |
| int indx; |
| for (indx = 0; indx < posCount; indx++) { |
| posPtr[indx].fX = positions[indx << 1]; |
| posPtr[indx].fY = positions[(indx << 1) + 1]; |
| } |
| |
| SkPaint paintCopy(paint); |
| paintCopy.setTextEncoding(SkPaint::kUTF16_TextEncoding); |
| mCanvas->drawPosText(text, count, posPtr, paintCopy); |
| |
| delete[] posPtr; |
| } |
| |
| void SkiaCanvas::drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, |
| float hOffset, float vOffset, const SkPaint& paint) { |
| mCanvas->drawTextOnPathHV(glyphs, count << 1, path, hOffset, vOffset, paint); |
| } |
| |
| } // namespace android |
