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/*
* 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;
}
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