SkiaCanvasProxy.cpp revision afbd0f1fef46ef0ddf633dfde0de724db3da1405 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "SkiaCanvasProxy.h"
18
19#include <cutils/log.h>
20#include <SkPatchUtils.h>
21#include <SkPaint.h>
22#include <SkPath.h>
23#include <SkPixelRef.h>
24#include <SkRect.h>
25#include <SkRRect.h>
26
27#include <memory>
28
29namespace android {
30namespace uirenderer {
31
32SkiaCanvasProxy::SkiaCanvasProxy(Canvas* canvas, bool filterHwuiCalls)
33        : INHERITED(canvas->width(), canvas->height())
34        , mCanvas(canvas)
35        , mFilterHwuiCalls(filterHwuiCalls) {}
36
37void SkiaCanvasProxy::onDrawPaint(const SkPaint& paint) {
38    mCanvas->drawPaint(paint);
39}
40
41void SkiaCanvasProxy::onDrawPoints(PointMode pointMode, size_t count, const SkPoint pts[],
42        const SkPaint& paint) {
43    if (!pts || count == 0) {
44        return;
45    }
46
47    // convert the SkPoints into floats
48    static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
49    const size_t floatCount = count << 1;
50    const float* floatArray = &pts[0].fX;
51
52    switch (pointMode) {
53        case kPoints_PointMode: {
54            mCanvas->drawPoints(floatArray, floatCount, paint);
55            break;
56        }
57        case kLines_PointMode: {
58            mCanvas->drawLines(floatArray, floatCount, paint);
59            break;
60        }
61        case kPolygon_PointMode: {
62            SkPaint strokedPaint(paint);
63            strokedPaint.setStyle(SkPaint::kStroke_Style);
64
65            SkPath path;
66            for (size_t i = 0; i < count - 1; i++) {
67                path.moveTo(pts[i]);
68                path.lineTo(pts[i+1]);
69                this->drawPath(path, strokedPaint);
70                path.rewind();
71            }
72            break;
73        }
74        default:
75            LOG_ALWAYS_FATAL("Unknown point type");
76    }
77}
78
79void SkiaCanvasProxy::onDrawOval(const SkRect& rect, const SkPaint& paint) {
80    mCanvas->drawOval(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
81}
82
83void SkiaCanvasProxy::onDrawRect(const SkRect& rect, const SkPaint& paint) {
84    mCanvas->drawRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
85}
86
87void SkiaCanvasProxy::onDrawRRect(const SkRRect& roundRect, const SkPaint& paint) {
88    if (!roundRect.isComplex()) {
89        const SkRect& rect = roundRect.rect();
90        SkVector radii = roundRect.getSimpleRadii();
91        mCanvas->drawRoundRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
92                               radii.fX, radii.fY, paint);
93    } else {
94        SkPath path;
95        path.addRRect(roundRect);
96        mCanvas->drawPath(path, paint);
97    }
98}
99
100void SkiaCanvasProxy::onDrawPath(const SkPath& path, const SkPaint& paint) {
101    mCanvas->drawPath(path, paint);
102}
103
104void SkiaCanvasProxy::onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
105        const SkPaint* paint) {
106    SkPixelRef* pxRef = bitmap.pixelRef();
107
108    // HWUI doesn't support extractSubset(), so convert any subsetted bitmap into
109    // a drawBitmapRect(); pass through an un-subsetted bitmap.
110    if (pxRef && bitmap.dimensions() != pxRef->info().dimensions()) {
111        SkBitmap fullBitmap;
112        fullBitmap.setInfo(pxRef->info());
113        fullBitmap.setPixelRef(pxRef, 0, 0);
114        SkIPoint origin = bitmap.pixelRefOrigin();
115        mCanvas->drawBitmap(fullBitmap, origin.fX, origin.fY,
116                            origin.fX + bitmap.dimensions().width(),
117                            origin.fY + bitmap.dimensions().height(),
118                            left, top,
119                            left + bitmap.dimensions().width(),
120                            top + bitmap.dimensions().height(),
121                            paint);
122    } else {
123        mCanvas->drawBitmap(bitmap, left, top, paint);
124    }
125}
126
127void SkiaCanvasProxy::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* srcPtr,
128        const SkRect& dst, const SkPaint* paint, SrcRectConstraint) {
129    SkRect src = (srcPtr) ? *srcPtr : SkRect::MakeWH(bitmap.width(), bitmap.height());
130    // TODO: if bitmap is a subset, do we need to add pixelRefOrigin to src?
131    mCanvas->drawBitmap(bitmap, src.fLeft, src.fTop, src.fRight, src.fBottom,
132                        dst.fLeft, dst.fTop, dst.fRight, dst.fBottom, paint);
133}
134
135void SkiaCanvasProxy::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
136        const SkRect& dst, const SkPaint*) {
137    //TODO make nine-patch drawing a method on Canvas.h
138    SkDEBUGFAIL("SkiaCanvasProxy::onDrawBitmapNine is not yet supported");
139}
140
141void SkiaCanvasProxy::onDrawVertices(VertexMode mode, int vertexCount, const SkPoint vertices[],
142        const SkPoint texs[], const SkColor colors[], SkXfermode*, const uint16_t indices[],
143        int indexCount, const SkPaint& paint) {
144    if (mFilterHwuiCalls) {
145        return;
146    }
147    // convert the SkPoints into floats
148    static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
149    const int floatCount = vertexCount << 1;
150    const float* vArray = &vertices[0].fX;
151    const float* tArray = (texs) ? &texs[0].fX : NULL;
152    const int* cArray = (colors) ? (int*)colors : NULL;
153    mCanvas->drawVertices(mode, floatCount, vArray, tArray, cArray, indices, indexCount, paint);
154}
155
156SkSurface* SkiaCanvasProxy::onNewSurface(const SkImageInfo&, const SkSurfaceProps&) {
157    SkDEBUGFAIL("SkiaCanvasProxy::onNewSurface is not supported");
158    return NULL;
159}
160
161void SkiaCanvasProxy::willSave() {
162    mCanvas->save(android::SaveFlags::MatrixClip);
163}
164
165static inline SaveFlags::Flags saveFlags(SkCanvas::SaveLayerFlags layerFlags) {
166    SaveFlags::Flags saveFlags = 0;
167
168    if (!(layerFlags & SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag)) {
169        saveFlags |= SaveFlags::ClipToLayer;
170    }
171
172    if (!(layerFlags & SkCanvas::kIsOpaque_SaveLayerFlag)) {
173        saveFlags |= SaveFlags::HasAlphaLayer;
174    }
175
176    return saveFlags;
177}
178
179SkCanvas::SaveLayerStrategy SkiaCanvasProxy::getSaveLayerStrategy(const SaveLayerRec& saveLayerRec) {
180    SkRect rect;
181    if (saveLayerRec.fBounds) {
182        rect = *saveLayerRec.fBounds;
183    } else if (!mCanvas->getClipBounds(&rect)) {
184        rect = SkRect::MakeEmpty();
185    }
186    mCanvas->saveLayer(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, saveLayerRec.fPaint,
187                       saveFlags(saveLayerRec.fSaveLayerFlags));
188    return SkCanvas::kNoLayer_SaveLayerStrategy;
189}
190
191void SkiaCanvasProxy::willRestore() {
192    mCanvas->restore();
193}
194
195void SkiaCanvasProxy::didConcat(const SkMatrix& matrix) {
196    mCanvas->concat(matrix);
197}
198
199void SkiaCanvasProxy::didSetMatrix(const SkMatrix& matrix) {
200    mCanvas->setMatrix(matrix);
201}
202
203void SkiaCanvasProxy::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
204        const SkPaint& paint) {
205    SkPath path;
206    path.addRRect(outer);
207    path.addRRect(inner);
208    path.setFillType(SkPath::kEvenOdd_FillType);
209    this->drawPath(path, paint);
210}
211
212/**
213 * Utility class that converts the incoming text & paint from the given encoding
214 * into glyphIDs.
215 */
216class GlyphIDConverter {
217public:
218    GlyphIDConverter(const void* text, size_t byteLength, const SkPaint& origPaint) {
219        paint = origPaint;
220        if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
221            glyphIDs = (uint16_t*)text;
222            count = byteLength >> 1;
223        } else {
224             // ensure space for one glyph per ID given UTF8 encoding.
225            storage.reset(new uint16_t[byteLength]);
226            glyphIDs = storage.get();
227            count = paint.textToGlyphs(text, byteLength, storage.get());
228            paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
229        }
230    }
231
232    SkPaint paint;
233    uint16_t* glyphIDs;
234    int count;
235private:
236    std::unique_ptr<uint16_t[]> storage;
237};
238
239void SkiaCanvasProxy::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
240        const SkPaint& origPaint) {
241    // convert to glyphIDs if necessary
242    GlyphIDConverter glyphs(text, byteLength, origPaint);
243
244    // compute the glyph positions
245    std::unique_ptr<SkPoint[]> pointStorage(new SkPoint[glyphs.count]);
246    std::unique_ptr<SkScalar[]> glyphWidths(new SkScalar[glyphs.count]);
247    glyphs.paint.getTextWidths(glyphs.glyphIDs, glyphs.count << 1, glyphWidths.get());
248
249    // compute conservative bounds
250    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
251    //       but even more conservative bounds if this  is too slow.
252    SkRect bounds;
253    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
254
255    // adjust for non-left alignment
256    if (glyphs.paint.getTextAlign() != SkPaint::kLeft_Align) {
257        SkScalar stop = 0;
258        for (int i = 0; i < glyphs.count; i++) {
259            stop += glyphWidths[i];
260        }
261        if (glyphs.paint.getTextAlign() == SkPaint::kCenter_Align) {
262            stop = SkScalarHalf(stop);
263        }
264        if (glyphs.paint.isVerticalText()) {
265            y -= stop;
266        } else {
267            x -= stop;
268        }
269    }
270
271    // setup the first glyph position and adjust bounds if needed
272    int xBaseline = 0;
273    int yBaseline = 0;
274    if (mCanvas->drawTextAbsolutePos()) {
275        bounds.offset(x,y);
276        xBaseline = x;
277        yBaseline = y;
278    }
279    pointStorage[0].set(xBaseline, yBaseline);
280
281    // setup the remaining glyph positions
282    if (glyphs.paint.isVerticalText()) {
283        for (int i = 1; i < glyphs.count; i++) {
284            pointStorage[i].set(xBaseline, glyphWidths[i-1] + pointStorage[i-1].fY);
285        }
286    } else {
287        for (int i = 1; i < glyphs.count; i++) {
288            pointStorage[i].set(glyphWidths[i-1] + pointStorage[i-1].fX, yBaseline);
289        }
290    }
291
292    static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
293    mCanvas->drawText(glyphs.glyphIDs, &pointStorage[0].fX, glyphs.count, glyphs.paint,
294                      x, y, bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
295}
296
297void SkiaCanvasProxy::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
298        const SkPaint& origPaint) {
299    // convert to glyphIDs if necessary
300    GlyphIDConverter glyphs(text, byteLength, origPaint);
301
302    // convert to relative positions if necessary
303    int x, y;
304    const SkPoint* posArray;
305    std::unique_ptr<SkPoint[]> pointStorage;
306    if (mCanvas->drawTextAbsolutePos()) {
307        x = 0;
308        y = 0;
309        posArray = pos;
310    } else {
311        x = pos[0].fX;
312        y = pos[0].fY;
313        pointStorage.reset(new SkPoint[glyphs.count]);
314        for (int i = 0; i < glyphs.count; i++) {
315            pointStorage[i].fX = pos[i].fX - x;
316            pointStorage[i].fY = pos[i].fY - y;
317        }
318        posArray = pointStorage.get();
319    }
320
321    // compute conservative bounds
322    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
323    //       but even more conservative bounds if this  is too slow.
324    SkRect bounds;
325    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
326    bounds.offset(x, y);
327
328    static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
329    mCanvas->drawText(glyphs.glyphIDs, &posArray[0].fX, glyphs.count, glyphs.paint, x, y,
330                      bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
331}
332
333void SkiaCanvasProxy::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
334        SkScalar constY, const SkPaint& paint) {
335    const size_t pointCount = byteLength >> 1;
336    std::unique_ptr<SkPoint[]> pts(new SkPoint[pointCount]);
337    for (size_t i = 0; i < pointCount; i++) {
338        pts[i].set(xpos[i], constY);
339    }
340    this->onDrawPosText(text, byteLength, pts.get(), paint);
341}
342
343void SkiaCanvasProxy::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
344        const SkMatrix* matrix, const SkPaint& origPaint) {
345    // convert to glyphIDs if necessary
346    GlyphIDConverter glyphs(text, byteLength, origPaint);
347    mCanvas->drawTextOnPath(glyphs.glyphIDs, glyphs.count, path, 0, 0, glyphs.paint);
348}
349
350void SkiaCanvasProxy::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
351        const SkPaint& paint) {
352    SkDEBUGFAIL("SkiaCanvasProxy::onDrawTextBlob is not supported");
353}
354
355void SkiaCanvasProxy::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
356        const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
357    if (mFilterHwuiCalls) {
358        return;
359    }
360    SkPatchUtils::VertexData data;
361
362    SkMatrix matrix;
363    mCanvas->getMatrix(&matrix);
364    SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix);
365
366    // It automatically adjusts lodX and lodY in case it exceeds the number of indices.
367    // If it fails to generate the vertices, then we do not draw.
368    if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) {
369        this->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints,
370                           data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount,
371                           paint);
372    }
373}
374
375void SkiaCanvasProxy::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) {
376    mCanvas->clipRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, op);
377}
378
379void SkiaCanvasProxy::onClipRRect(const SkRRect& roundRect, SkRegion::Op op, ClipEdgeStyle) {
380    SkPath path;
381    path.addRRect(roundRect);
382    mCanvas->clipPath(&path, op);
383}
384
385void SkiaCanvasProxy::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) {
386    mCanvas->clipPath(&path, op);
387}
388
389void SkiaCanvasProxy::onClipRegion(const SkRegion& region, SkRegion::Op op) {
390    mCanvas->clipRegion(&region, op);
391}
392
393}; // namespace uirenderer
394}; // namespace android
395