| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkDevice.h" |
| #include "SkDeviceProperties.h" |
| #include "SkDraw.h" |
| #include "SkMetaData.h" |
| #include "SkPatchUtils.h" |
| #include "SkShader.h" |
| #include "SkTextBlob.h" |
| |
| SkBaseDevice::SkBaseDevice() |
| : fLeakyProperties(SkNEW_ARGS(SkDeviceProperties, (SkDeviceProperties::kLegacyLCD_InitType))) |
| #ifdef SK_DEBUG |
| , fAttachedToCanvas(false) |
| #endif |
| { |
| fOrigin.setZero(); |
| fMetaData = NULL; |
| } |
| |
| SkBaseDevice::SkBaseDevice(const SkDeviceProperties& dp) |
| : fLeakyProperties(SkNEW_ARGS(SkDeviceProperties, (dp))) |
| #ifdef SK_DEBUG |
| , fAttachedToCanvas(false) |
| #endif |
| { |
| fOrigin.setZero(); |
| fMetaData = NULL; |
| } |
| |
| SkBaseDevice::~SkBaseDevice() { |
| SkDELETE(fLeakyProperties); |
| SkDELETE(fMetaData); |
| } |
| |
| SkMetaData& SkBaseDevice::getMetaData() { |
| // metadata users are rare, so we lazily allocate it. If that changes we |
| // can decide to just make it a field in the device (rather than a ptr) |
| if (NULL == fMetaData) { |
| fMetaData = new SkMetaData; |
| } |
| return *fMetaData; |
| } |
| |
| SkImageInfo SkBaseDevice::imageInfo() const { |
| return SkImageInfo::MakeUnknown(); |
| } |
| |
| const SkBitmap& SkBaseDevice::accessBitmap(bool changePixels) { |
| const SkBitmap& bitmap = this->onAccessBitmap(); |
| if (changePixels) { |
| bitmap.notifyPixelsChanged(); |
| } |
| return bitmap; |
| } |
| |
| SkPixelGeometry SkBaseDevice::CreateInfo::AdjustGeometry(const SkImageInfo& info, |
| Usage usage, |
| SkPixelGeometry geo) { |
| switch (usage) { |
| case kGeneral_Usage: |
| break; |
| case kSaveLayer_Usage: |
| if (info.alphaType() != kOpaque_SkAlphaType) { |
| geo = kUnknown_SkPixelGeometry; |
| } |
| break; |
| case kImageFilter_Usage: |
| geo = kUnknown_SkPixelGeometry; |
| break; |
| } |
| return geo; |
| } |
| |
| void SkBaseDevice::initForRootLayer(SkPixelGeometry geo) { |
| // For now we don't expect to change the geometry for the root-layer, but we make the call |
| // anyway to document logically what is going on. |
| // |
| fLeakyProperties->setPixelGeometry(CreateInfo::AdjustGeometry(this->imageInfo(), |
| kGeneral_Usage, |
| geo)); |
| } |
| |
| SkSurface* SkBaseDevice::newSurface(const SkImageInfo&, const SkSurfaceProps&) { return NULL; } |
| |
| const void* SkBaseDevice::peekPixels(SkImageInfo*, size_t*) { return NULL; } |
| |
| void SkBaseDevice::drawDRRect(const SkDraw& draw, const SkRRect& outer, |
| const SkRRect& inner, const SkPaint& paint) { |
| SkPath path; |
| path.addRRect(outer); |
| path.addRRect(inner); |
| path.setFillType(SkPath::kEvenOdd_FillType); |
| |
| const SkMatrix* preMatrix = NULL; |
| const bool pathIsMutable = true; |
| this->drawPath(draw, path, paint, preMatrix, pathIsMutable); |
| } |
| |
| void SkBaseDevice::drawPatch(const SkDraw& draw, const SkPoint cubics[12], const SkColor colors[4], |
| const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) { |
| SkPatchUtils::VertexData data; |
| |
| SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, draw.fMatrix); |
| |
| // It automatically adjusts lodX and lodY in case it exceeds the number of indices. |
| // If it fails to generate the vertices, then we do not draw. |
| if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) { |
| this->drawVertices(draw, SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints, |
| data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount, |
| paint); |
| } |
| } |
| |
| void SkBaseDevice::drawTextBlob(const SkDraw& draw, const SkTextBlob* blob, SkScalar x, SkScalar y, |
| const SkPaint &paint) { |
| |
| SkPaint runPaint = paint; |
| |
| SkTextBlob::RunIterator it(blob); |
| while (!it.done()) { |
| size_t textLen = it.glyphCount() * sizeof(uint16_t); |
| const SkPoint& offset = it.offset(); |
| // applyFontToPaint() always overwrites the exact same attributes, |
| // so it is safe to not re-seed the paint. |
| it.applyFontToPaint(&runPaint); |
| runPaint.setFlags(this->filterTextFlags(runPaint)); |
| |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: |
| this->drawText(draw, it.glyphs(), textLen, x + offset.x(), y + offset.y(), runPaint); |
| break; |
| case SkTextBlob::kHorizontal_Positioning: |
| this->drawPosText(draw, it.glyphs(), textLen, it.pos(), 1, |
| SkPoint::Make(x, y + offset.y()), runPaint); |
| break; |
| case SkTextBlob::kFull_Positioning: |
| this->drawPosText(draw, it.glyphs(), textLen, it.pos(), 2, |
| SkPoint::Make(x, y), runPaint); |
| break; |
| default: |
| SkFAIL("unhandled positioning mode"); |
| } |
| |
| it.next(); |
| } |
| } |
| |
| bool SkBaseDevice::readPixels(const SkImageInfo& info, void* dstP, size_t rowBytes, int x, int y) { |
| #ifdef SK_DEBUG |
| SkASSERT(info.width() > 0 && info.height() > 0); |
| SkASSERT(dstP); |
| SkASSERT(rowBytes >= info.minRowBytes()); |
| SkASSERT(x >= 0 && y >= 0); |
| |
| const SkImageInfo& srcInfo = this->imageInfo(); |
| SkASSERT(x + info.width() <= srcInfo.width()); |
| SkASSERT(y + info.height() <= srcInfo.height()); |
| #endif |
| return this->onReadPixels(info, dstP, rowBytes, x, y); |
| } |
| |
| bool SkBaseDevice::writePixels(const SkImageInfo& info, const void* pixels, size_t rowBytes, |
| int x, int y) { |
| #ifdef SK_DEBUG |
| SkASSERT(info.width() > 0 && info.height() > 0); |
| SkASSERT(pixels); |
| SkASSERT(rowBytes >= info.minRowBytes()); |
| SkASSERT(x >= 0 && y >= 0); |
| |
| const SkImageInfo& dstInfo = this->imageInfo(); |
| SkASSERT(x + info.width() <= dstInfo.width()); |
| SkASSERT(y + info.height() <= dstInfo.height()); |
| #endif |
| return this->onWritePixels(info, pixels, rowBytes, x, y); |
| } |
| |
| bool SkBaseDevice::onWritePixels(const SkImageInfo&, const void*, size_t, int, int) { |
| return false; |
| } |
| |
| bool SkBaseDevice::onReadPixels(const SkImageInfo&, void*, size_t, int x, int y) { |
| return false; |
| } |
| |
| void* SkBaseDevice::accessPixels(SkImageInfo* info, size_t* rowBytes) { |
| SkImageInfo tmpInfo; |
| size_t tmpRowBytes; |
| if (NULL == info) { |
| info = &tmpInfo; |
| } |
| if (NULL == rowBytes) { |
| rowBytes = &tmpRowBytes; |
| } |
| return this->onAccessPixels(info, rowBytes); |
| } |
| |
| void* SkBaseDevice::onAccessPixels(SkImageInfo* info, size_t* rowBytes) { |
| return NULL; |
| } |
| |
| bool SkBaseDevice::EXPERIMENTAL_drawPicture(SkCanvas*, const SkPicture*, const SkMatrix*, |
| const SkPaint*) { |
| // The base class doesn't perform any accelerated picture rendering |
| return false; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////// |
| |
| uint32_t SkBaseDevice::filterTextFlags(const SkPaint& paint) const { |
| uint32_t flags = paint.getFlags(); |
| |
| if (!paint.isLCDRenderText() || !paint.isAntiAlias()) { |
| return flags; |
| } |
| |
| if (kUnknown_SkPixelGeometry == fLeakyProperties->pixelGeometry() |
| || this->onShouldDisableLCD(paint)) { |
| |
| flags &= ~SkPaint::kLCDRenderText_Flag; |
| flags |= SkPaint::kGenA8FromLCD_Flag; |
| } |
| |
| return flags; |
| } |
| |