Move SkBitmapDevice functions to their own file

src/core/SkBitmapDevice.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBitmapDevice.h"
+#include "SkConfig8888.h"
+#include "SkDraw.h"
+#include "SkRasterClip.h"
+#include "SkShader.h"
+
+SK_DEFINE_INST_COUNT(SkBitmapDevice)
+
+#define CHECK_FOR_NODRAW_ANNOTATION(paint) \
+    do { if (paint.isNoDrawAnnotation()) { return; } } while (0)
+
+SkBitmapDevice::SkBitmapDevice(const SkBitmap& bitmap)
+    : fBitmap(bitmap) {
+    SkASSERT(SkBitmap::kARGB_4444_Config != bitmap.config());
+}
+
+SkBitmapDevice::SkBitmapDevice(const SkBitmap& bitmap, const SkDeviceProperties& deviceProperties)
+    : SkBaseDevice(deviceProperties)
+    , fBitmap(bitmap) {
+}
+
+SkBitmapDevice::SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque) {
+    fBitmap.setConfig(config, width, height);
+    fBitmap.allocPixels();
+    fBitmap.setIsOpaque(isOpaque);
+    if (!isOpaque) {
+        fBitmap.eraseColor(SK_ColorTRANSPARENT);
+    }
+}
+
+SkBitmapDevice::SkBitmapDevice(SkBitmap::Config config, int width, int height, bool isOpaque,
+                               const SkDeviceProperties& deviceProperties)
+    : SkBaseDevice(deviceProperties) {
+
+    fBitmap.setConfig(config, width, height);
+    fBitmap.allocPixels();
+    fBitmap.setIsOpaque(isOpaque);
+    if (!isOpaque) {
+        fBitmap.eraseColor(SK_ColorTRANSPARENT);
+    }
+}
+
+SkBitmapDevice::~SkBitmapDevice() {
+}
+
+void SkBitmapDevice::replaceBitmapBackendForRasterSurface(const SkBitmap& bm) {
+    SkASSERT(bm.width() == fBitmap.width());
+    SkASSERT(bm.height() == fBitmap.height());
+    fBitmap = bm;   // intent is to use bm's pixelRef (and rowbytes/config)
+    fBitmap.lockPixels();
+}
+
+SkBaseDevice* SkBitmapDevice::onCreateCompatibleDevice(SkBitmap::Config config,
+                                                       int width, int height,
+                                                       bool isOpaque,
+                                                       Usage usage) {
+    return SkNEW_ARGS(SkBitmapDevice,(config, width, height, isOpaque,
+                                      this->getDeviceProperties()));
+}
+
+void SkBitmapDevice::lockPixels() {
+    if (fBitmap.lockPixelsAreWritable()) {
+        fBitmap.lockPixels();
+    }
+}
+
+void SkBitmapDevice::unlockPixels() {
+    if (fBitmap.lockPixelsAreWritable()) {
+        fBitmap.unlockPixels();
+    }
+}
+
+void SkBitmapDevice::getGlobalBounds(SkIRect* bounds) const {
+    if (NULL != bounds) {
+        const SkIPoint& origin = this->getOrigin();
+        bounds->setXYWH(origin.x(), origin.y(),
+                        fBitmap.width(), fBitmap.height());
+    }
+}
+
+void SkBitmapDevice::clear(SkColor color) {
+    fBitmap.eraseColor(color);
+}
+
+const SkBitmap& SkBitmapDevice::onAccessBitmap() {
+    return fBitmap;
+}
+
+bool SkBitmapDevice::canHandleImageFilter(SkImageFilter*) {
+    return false;
+}
+
+bool SkBitmapDevice::filterImage(SkImageFilter* filter, const SkBitmap& src,
+                                 const SkMatrix& ctm, SkBitmap* result,
+                                 SkIPoint* offset) {
+    return false;
+}
+
+bool SkBitmapDevice::allowImageFilter(SkImageFilter*) {
+    return true;
+}
+
+bool SkBitmapDevice::onReadPixels(const SkBitmap& bitmap,
+                                  int x, int y,
+                                  SkCanvas::Config8888 config8888) {
+    SkASSERT(SkBitmap::kARGB_8888_Config == bitmap.config());
+    SkASSERT(!bitmap.isNull());
+    SkASSERT(SkIRect::MakeWH(this->width(), this->height()).contains(SkIRect::MakeXYWH(x, y, 
+                                                                          bitmap.width(), 
+                                                                          bitmap.height())));
+
+    SkIRect srcRect = SkIRect::MakeXYWH(x, y, bitmap.width(), bitmap.height());
+    const SkBitmap& src = this->accessBitmap(false);
+
+    SkBitmap subset;
+    if (!src.extractSubset(&subset, srcRect)) {
+        return false;
+    }
+    if (SkBitmap::kARGB_8888_Config != subset.config()) {
+        // It'd be preferable to do this directly to bitmap.
+        subset.copyTo(&subset, SkBitmap::kARGB_8888_Config);
+    }
+    SkAutoLockPixels alp(bitmap);
+    uint32_t* bmpPixels = reinterpret_cast<uint32_t*>(bitmap.getPixels());
+    SkCopyBitmapToConfig8888(bmpPixels, bitmap.rowBytes(), config8888, subset);
+    return true;
+}
+
+void SkBitmapDevice::writePixels(const SkBitmap& bitmap,
+                                 int x, int y,
+                                 SkCanvas::Config8888 config8888) {
+    if (bitmap.isNull() || bitmap.getTexture()) {
+        return;
+    }
+    const SkBitmap* sprite = &bitmap;
+    // check whether we have to handle a config8888 that doesn't match SkPMColor
+    if (SkBitmap::kARGB_8888_Config == bitmap.config() &&
+        SkCanvas::kNative_Premul_Config8888 != config8888 &&
+        kPMColorAlias != config8888) {
+
+        // We're going to have to convert from a config8888 to the native config
+        // First we clip to the device bounds.
+        SkBitmap dstBmp = this->accessBitmap(true);
+        SkIRect spriteRect = SkIRect::MakeXYWH(x, y,
+                                               bitmap.width(), bitmap.height());
+        SkIRect devRect = SkIRect::MakeWH(dstBmp.width(), dstBmp.height());
+        if (!spriteRect.intersect(devRect)) {
+            return;
+        }
+
+        // write directly to the device if it has pixels and is SkPMColor
+        bool drawSprite;
+        if (SkBitmap::kARGB_8888_Config == dstBmp.config() && !dstBmp.isNull()) {
+            // we can write directly to the dst when doing the conversion
+            dstBmp.extractSubset(&dstBmp, spriteRect);
+            drawSprite = false;
+        } else {
+            // we convert to a temporary bitmap and draw that as a sprite
+            dstBmp.setConfig(SkBitmap::kARGB_8888_Config,
+                             spriteRect.width(),
+                             spriteRect.height());
+            if (!dstBmp.allocPixels()) {
+                return;
+            }
+            drawSprite = true;
+        }
+
+        // copy pixels to dstBmp and convert from config8888 to native config.
+        SkAutoLockPixels alp(bitmap);
+        uint32_t* srcPixels = bitmap.getAddr32(spriteRect.fLeft - x,
+                                               spriteRect.fTop - y);
+        SkCopyConfig8888ToBitmap(dstBmp,
+                                 srcPixels,
+                                 bitmap.rowBytes(),
+                                 config8888);
+
+        if (drawSprite) {
+            // we've clipped the sprite when we made a copy
+            x = spriteRect.fLeft;
+            y = spriteRect.fTop;
+            sprite = &dstBmp;
+        } else {
+            return;
+        }
+    }
+
+    SkPaint paint;
+    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    SkRasterClip clip(SkIRect::MakeWH(fBitmap.width(), fBitmap.height()));
+    SkDraw  draw;
+    draw.fRC = &clip;
+    draw.fClip = &clip.bwRgn();
+    draw.fBitmap = &fBitmap; // canvas should have already called accessBitmap
+    draw.fMatrix = &SkMatrix::I();
+    this->drawSprite(draw, *sprite, x, y, paint);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void SkBitmapDevice::drawPaint(const SkDraw& draw, const SkPaint& paint) {
+    draw.drawPaint(paint);
+}
+
+void SkBitmapDevice::drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
+                                const SkPoint pts[], const SkPaint& paint) {
+    CHECK_FOR_NODRAW_ANNOTATION(paint);
+    draw.drawPoints(mode, count, pts, paint);
+}
+
+void SkBitmapDevice::drawRect(const SkDraw& draw, const SkRect& r, const SkPaint& paint) {
+    CHECK_FOR_NODRAW_ANNOTATION(paint);
+    draw.drawRect(r, paint);
+}
+
+void SkBitmapDevice::drawOval(const SkDraw& draw, const SkRect& oval, const SkPaint& paint) {
+    CHECK_FOR_NODRAW_ANNOTATION(paint);
+
+    SkPath path;
+    path.addOval(oval);
+    // call the VIRTUAL version, so any subclasses who do handle drawPath aren't
+    // required to override drawOval.
+    this->drawPath(draw, path, paint, NULL, true);
+}
+
+void SkBitmapDevice::drawRRect(const SkDraw& draw, const SkRRect& rrect, const SkPaint& paint) {
+    CHECK_FOR_NODRAW_ANNOTATION(paint);
+
+    SkPath  path;
+    path.addRRect(rrect);
+    // call the VIRTUAL version, so any subclasses who do handle drawPath aren't
+    // required to override drawRRect.
+    this->drawPath(draw, path, paint, NULL, true);
+}
+
+void SkBitmapDevice::drawPath(const SkDraw& draw, const SkPath& path,
+                              const SkPaint& paint, const SkMatrix* prePathMatrix,
+                              bool pathIsMutable) {
+    CHECK_FOR_NODRAW_ANNOTATION(paint);
+    draw.drawPath(path, paint, prePathMatrix, pathIsMutable);
+}
+
+void SkBitmapDevice::drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
+                                const SkMatrix& matrix, const SkPaint& paint) {
+    draw.drawBitmap(bitmap, matrix, paint);
+}
+
+void SkBitmapDevice::drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
+                                    const SkRect* src, const SkRect& dst,
+                                    const SkPaint& paint,
+                                    SkCanvas::DrawBitmapRectFlags flags) {
+    SkMatrix    matrix;
+    SkRect      bitmapBounds, tmpSrc, tmpDst;
+    SkBitmap    tmpBitmap;
+
+    bitmapBounds.isetWH(bitmap.width(), bitmap.height());
+
+    // Compute matrix from the two rectangles
+    if (src) {
+        tmpSrc = *src;
+    } else {
+        tmpSrc = bitmapBounds;
+    }
+    matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
+
+    const SkRect* dstPtr = &dst;
+    const SkBitmap* bitmapPtr = &bitmap;
+
+    // clip the tmpSrc to the bounds of the bitmap, and recompute dstRect if
+    // needed (if the src was clipped). No check needed if src==null.
+    if (src) {
+        if (!bitmapBounds.contains(*src)) {
+            if (!tmpSrc.intersect(bitmapBounds)) {
+                return; // nothing to draw
+            }
+            // recompute dst, based on the smaller tmpSrc
+            matrix.mapRect(&tmpDst, tmpSrc);
+            dstPtr = &tmpDst;
+        }
+
+        // since we may need to clamp to the borders of the src rect within
+        // the bitmap, we extract a subset.
+        SkIRect srcIR;
+        tmpSrc.roundOut(&srcIR);
+        if (!bitmap.extractSubset(&tmpBitmap, srcIR)) {
+            return;
+        }
+        bitmapPtr = &tmpBitmap;
+
+        // Since we did an extract, we need to adjust the matrix accordingly
+        SkScalar dx = 0, dy = 0;
+        if (srcIR.fLeft > 0) {
+            dx = SkIntToScalar(srcIR.fLeft);
+        }
+        if (srcIR.fTop > 0) {
+            dy = SkIntToScalar(srcIR.fTop);
+        }
+        if (dx || dy) {
+            matrix.preTranslate(dx, dy);
+        }
+
+        SkRect extractedBitmapBounds;
+        extractedBitmapBounds.isetWH(bitmapPtr->width(), bitmapPtr->height());
+        if (extractedBitmapBounds == tmpSrc) {
+            // no fractional part in src, we can just call drawBitmap
+            goto USE_DRAWBITMAP;
+        }
+    } else {
+        USE_DRAWBITMAP:
+        // We can go faster by just calling drawBitmap, which will concat the
+        // matrix with the CTM, and try to call drawSprite if it can. If not,
+        // it will make a shader and call drawRect, as we do below.
+        this->drawBitmap(draw, *bitmapPtr, matrix, paint);
+        return;
+    }
+
+    // construct a shader, so we can call drawRect with the dst
+    SkShader* s = SkShader::CreateBitmapShader(*bitmapPtr,
+                                               SkShader::kClamp_TileMode,
+                                               SkShader::kClamp_TileMode);
+    if (NULL == s) {
+        return;
+    }
+    s->setLocalMatrix(matrix);
+
+    SkPaint paintWithShader(paint);
+    paintWithShader.setStyle(SkPaint::kFill_Style);
+    paintWithShader.setShader(s)->unref();
+
+    // Call ourself, in case the subclass wanted to share this setup code
+    // but handle the drawRect code themselves.
+    this->drawRect(draw, *dstPtr, paintWithShader);
+}
+
+void SkBitmapDevice::drawSprite(const SkDraw& draw, const SkBitmap& bitmap,
+                                int x, int y, const SkPaint& paint) {
+    draw.drawSprite(bitmap, x, y, paint);
+}
+
+void SkBitmapDevice::drawText(const SkDraw& draw, const void* text, size_t len,
+                              SkScalar x, SkScalar y, const SkPaint& paint) {
+    draw.drawText((const char*)text, len, x, y, paint);
+}
+
+void SkBitmapDevice::drawPosText(const SkDraw& draw, const void* text, size_t len,
+                                 const SkScalar xpos[], SkScalar y,
+                                 int scalarsPerPos, const SkPaint& paint) {
+    draw.drawPosText((const char*)text, len, xpos, y, scalarsPerPos, paint);
+}
+
+void SkBitmapDevice::drawTextOnPath(const SkDraw& draw, const void* text,
+                                    size_t len, const SkPath& path,
+                                    const SkMatrix* matrix,
+                                    const SkPaint& paint) {
+    draw.drawTextOnPath((const char*)text, len, path, matrix, paint);
+}
+
+#ifdef SK_BUILD_FOR_ANDROID
+void SkBitmapDevice::drawPosTextOnPath(const SkDraw& draw, const void* text, size_t len,
+                                       const SkPoint pos[], const SkPaint& paint,
+                                       const SkPath& path, const SkMatrix* matrix) {
+    draw.drawPosTextOnPath((const char*)text, len, pos, paint, path, matrix);
+}
+#endif
+
+void SkBitmapDevice::drawVertices(const SkDraw& draw, SkCanvas::VertexMode vmode,
+                                  int vertexCount,
+                                  const SkPoint verts[], const SkPoint textures[],
+                                  const SkColor colors[], SkXfermode* xmode,
+                                  const uint16_t indices[], int indexCount,
+                                  const SkPaint& paint) {
+    draw.drawVertices(vmode, vertexCount, verts, textures, colors, xmode,
+                      indices, indexCount, paint);
+}
+
+void SkBitmapDevice::drawDevice(const SkDraw& draw, SkBaseDevice* device,
+                                int x, int y, const SkPaint& paint) {
+    const SkBitmap& src = device->accessBitmap(false);
+    draw.drawSprite(src, x, y, paint);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+bool SkBitmapDevice::filterTextFlags(const SkPaint& paint, TextFlags* flags) {
+    if (!paint.isLCDRenderText() || !paint.isAntiAlias()) {
+        // we're cool with the paint as is
+        return false;
+    }
+
+    if (SkBitmap::kARGB_8888_Config != fBitmap.config() ||
+        paint.getRasterizer() ||
+        paint.getPathEffect() ||
+        paint.isFakeBoldText() ||
+        paint.getStyle() != SkPaint::kFill_Style ||
+        !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode)) {
+        // turn off lcd
+        flags->fFlags = paint.getFlags() & ~SkPaint::kLCDRenderText_Flag;
+        flags->fHinting = paint.getHinting();
+        return true;
+    }
+    // we're cool with the paint as is
+    return false;
+}
+