| /* |
| * 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 "SkPathMeasure.h" |
| #include "SkRasterClip.h" |
| #include "SkShader.h" |
| #include "SkTextBlob.h" |
| #include "SkTextToPathIter.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; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static void morphpoints(SkPoint dst[], const SkPoint src[], int count, |
| SkPathMeasure& meas, const SkMatrix& matrix) { |
| SkMatrix::MapXYProc proc = matrix.getMapXYProc(); |
| |
| for (int i = 0; i < count; i++) { |
| SkPoint pos; |
| SkVector tangent; |
| |
| proc(matrix, src[i].fX, src[i].fY, &pos); |
| SkScalar sx = pos.fX; |
| SkScalar sy = pos.fY; |
| |
| if (!meas.getPosTan(sx, &pos, &tangent)) { |
| // set to 0 if the measure failed, so that we just set dst == pos |
| tangent.set(0, 0); |
| } |
| |
| /* This is the old way (that explains our approach but is way too slow |
| SkMatrix matrix; |
| SkPoint pt; |
| |
| pt.set(sx, sy); |
| matrix.setSinCos(tangent.fY, tangent.fX); |
| matrix.preTranslate(-sx, 0); |
| matrix.postTranslate(pos.fX, pos.fY); |
| matrix.mapPoints(&dst[i], &pt, 1); |
| */ |
| dst[i].set(pos.fX - SkScalarMul(tangent.fY, sy), |
| pos.fY + SkScalarMul(tangent.fX, sy)); |
| } |
| } |
| |
| /* TODO |
| |
| Need differentially more subdivisions when the follow-path is curvy. Not sure how to |
| determine that, but we need it. I guess a cheap answer is let the caller tell us, |
| but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out. |
| */ |
| static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas, |
| const SkMatrix& matrix) { |
| SkPath::Iter iter(src, false); |
| SkPoint srcP[4], dstP[3]; |
| SkPath::Verb verb; |
| |
| while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) { |
| switch (verb) { |
| case SkPath::kMove_Verb: |
| morphpoints(dstP, srcP, 1, meas, matrix); |
| dst->moveTo(dstP[0]); |
| break; |
| case SkPath::kLine_Verb: |
| // turn lines into quads to look bendy |
| srcP[0].fX = SkScalarAve(srcP[0].fX, srcP[1].fX); |
| srcP[0].fY = SkScalarAve(srcP[0].fY, srcP[1].fY); |
| morphpoints(dstP, srcP, 2, meas, matrix); |
| dst->quadTo(dstP[0], dstP[1]); |
| break; |
| case SkPath::kQuad_Verb: |
| morphpoints(dstP, &srcP[1], 2, meas, matrix); |
| dst->quadTo(dstP[0], dstP[1]); |
| break; |
| case SkPath::kCubic_Verb: |
| morphpoints(dstP, &srcP[1], 3, meas, matrix); |
| dst->cubicTo(dstP[0], dstP[1], dstP[2]); |
| break; |
| case SkPath::kClose_Verb: |
| dst->close(); |
| break; |
| default: |
| SkDEBUGFAIL("unknown verb"); |
| break; |
| } |
| } |
| } |
| |
| void SkBaseDevice::drawTextOnPath(const SkDraw& draw, const void* text, size_t byteLength, |
| const SkPath& follow, const SkMatrix* matrix, |
| const SkPaint& paint) { |
| SkASSERT(byteLength == 0 || text != NULL); |
| |
| // nothing to draw |
| if (text == NULL || byteLength == 0 || draw.fRC->isEmpty()) { |
| return; |
| } |
| |
| SkTextToPathIter iter((const char*)text, byteLength, paint, true); |
| SkPathMeasure meas(follow, false); |
| SkScalar hOffset = 0; |
| |
| // need to measure first |
| if (paint.getTextAlign() != SkPaint::kLeft_Align) { |
| SkScalar pathLen = meas.getLength(); |
| if (paint.getTextAlign() == SkPaint::kCenter_Align) { |
| pathLen = SkScalarHalf(pathLen); |
| } |
| hOffset += pathLen; |
| } |
| |
| const SkPath* iterPath; |
| SkScalar xpos; |
| SkMatrix scaledMatrix; |
| SkScalar scale = iter.getPathScale(); |
| |
| scaledMatrix.setScale(scale, scale); |
| |
| while (iter.next(&iterPath, &xpos)) { |
| if (iterPath) { |
| SkPath tmp; |
| SkMatrix m(scaledMatrix); |
| |
| tmp.setIsVolatile(true); |
| m.postTranslate(xpos + hOffset, 0); |
| if (matrix) { |
| m.postConcat(*matrix); |
| } |
| morphpath(&tmp, *iterPath, meas, m); |
| this->drawPath(draw, tmp, iter.getPaint(), NULL, true); |
| } |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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; |
| } |
| |