SkiaCanvasProxy.cpp revision 20c2b3ef74ac96fee5ef1daa7959c434d6caeb97 
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
22namespace android {
23namespace uirenderer {
24
25SkiaCanvasProxy::SkiaCanvasProxy(Canvas* canvas, bool filterHwuiCalls)
26        : INHERITED(canvas->width(), canvas->height())
27        , mCanvas(canvas)
28        , mFilterHwuiCalls(filterHwuiCalls) {}
29
30void SkiaCanvasProxy::onDrawPaint(const SkPaint& paint) {
31    mCanvas->drawPaint(paint);
32}
33
34void SkiaCanvasProxy::onDrawPoints(PointMode pointMode, size_t count, const SkPoint pts[],
35        const SkPaint& paint) {
36    if (!pts || count == 0) {
37        return;
38    }
39
40    // convert the SkPoints into floats
41    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
42    const size_t floatCount = count << 1;
43    const float* floatArray = &pts[0].fX;
44
45    switch (pointMode) {
46        case kPoints_PointMode: {
47            mCanvas->drawPoints(floatArray, floatCount, paint);
48            break;
49        }
50        case kLines_PointMode: {
51            mCanvas->drawLines(floatArray, floatCount, paint);
52            break;
53        }
54        case kPolygon_PointMode: {
55            SkPaint strokedPaint(paint);
56            strokedPaint.setStyle(SkPaint::kStroke_Style);
57
58            SkPath path;
59            for (size_t i = 0; i < count - 1; i++) {
60                path.moveTo(pts[i]);
61                path.lineTo(pts[i+1]);
62                this->drawPath(path, strokedPaint);
63                path.rewind();
64            }
65            break;
66        }
67        default:
68            LOG_ALWAYS_FATAL("Unknown point type");
69    }
70}
71
72void SkiaCanvasProxy::onDrawOval(const SkRect& rect, const SkPaint& paint) {
73    mCanvas->drawOval(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
74}
75
76void SkiaCanvasProxy::onDrawRect(const SkRect& rect, const SkPaint& paint) {
77    mCanvas->drawRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
78}
79
80void SkiaCanvasProxy::onDrawRRect(const SkRRect& roundRect, const SkPaint& paint) {
81    if (!roundRect.isComplex()) {
82        const SkRect& rect = roundRect.rect();
83        SkVector radii = roundRect.getSimpleRadii();
84        mCanvas->drawRoundRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
85                               radii.fX, radii.fY, paint);
86    } else {
87        SkPath path;
88        path.addRRect(roundRect);
89        mCanvas->drawPath(path, paint);
90    }
91}
92
93void SkiaCanvasProxy::onDrawPath(const SkPath& path, const SkPaint& paint) {
94    mCanvas->drawPath(path, paint);
95}
96
97void SkiaCanvasProxy::onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
98        const SkPaint* paint) {
99    mCanvas->drawBitmap(bitmap, left, top, paint);
100}
101
102void SkiaCanvasProxy::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* srcPtr,
103        const SkRect& dst, const SkPaint* paint, DrawBitmapRectFlags) {
104    SkRect src = (srcPtr) ? *srcPtr : SkRect::MakeWH(bitmap.width(), bitmap.height());
105    mCanvas->drawBitmap(bitmap, src.fLeft, src.fTop, src.fRight, src.fBottom,
106                        dst.fLeft, dst.fTop, dst.fRight, dst.fBottom, paint);
107}
108
109void SkiaCanvasProxy::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
110        const SkRect& dst, const SkPaint*) {
111    //TODO make nine-patch drawing a method on Canvas.h
112    SkDEBUGFAIL("SkiaCanvasProxy::onDrawBitmapNine is not yet supported");
113}
114
115void SkiaCanvasProxy::onDrawSprite(const SkBitmap& bitmap, int left, int top,
116        const SkPaint* paint) {
117    mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
118    mCanvas->setMatrix(SkMatrix::I());
119    mCanvas->drawBitmap(bitmap, left, top, paint);
120    mCanvas->restore();
121}
122
123void SkiaCanvasProxy::onDrawVertices(VertexMode mode, int vertexCount, const SkPoint vertices[],
124        const SkPoint texs[], const SkColor colors[], SkXfermode*, const uint16_t indices[],
125        int indexCount, const SkPaint& paint) {
126    if (mFilterHwuiCalls) {
127        return;
128    }
129    // convert the SkPoints into floats
130    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
131    const int floatCount = vertexCount << 1;
132    const float* vArray = &vertices[0].fX;
133    const float* tArray = (texs) ? &texs[0].fX : NULL;
134    const int* cArray = (colors) ? (int*)colors : NULL;
135    mCanvas->drawVertices(mode, floatCount, vArray, tArray, cArray, indices, indexCount, paint);
136}
137
138SkSurface* SkiaCanvasProxy::onNewSurface(const SkImageInfo&, const SkSurfaceProps&) {
139    SkDEBUGFAIL("SkiaCanvasProxy::onNewSurface is not supported");
140    return NULL;
141}
142
143void SkiaCanvasProxy::willSave() {
144    mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
145}
146
147SkCanvas::SaveLayerStrategy SkiaCanvasProxy::willSaveLayer(const SkRect* rectPtr,
148        const SkPaint* paint, SaveFlags flags) {
149    SkRect rect;
150    if (rectPtr) {
151        rect = *rectPtr;
152    } else if(!mCanvas->getClipBounds(&rect)) {
153        rect = SkRect::MakeEmpty();
154    }
155    mCanvas->saveLayer(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint, flags);
156    return SkCanvas::kNoLayer_SaveLayerStrategy;
157}
158
159void SkiaCanvasProxy::willRestore() {
160    mCanvas->restore();
161}
162
163void SkiaCanvasProxy::didConcat(const SkMatrix& matrix) {
164    mCanvas->concat(matrix);
165}
166
167void SkiaCanvasProxy::didSetMatrix(const SkMatrix& matrix) {
168    mCanvas->setMatrix(matrix);
169}
170
171void SkiaCanvasProxy::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
172        const SkPaint& paint) {
173    SkPath path;
174    path.addRRect(outer);
175    path.addRRect(inner);
176    path.setFillType(SkPath::kEvenOdd_FillType);
177    this->drawPath(path, paint);
178}
179
180/**
181 * Utility class that converts the incoming text & paint from the given encoding
182 * into glyphIDs.
183 */
184class GlyphIDConverter {
185public:
186    GlyphIDConverter(const void* text, size_t byteLength, const SkPaint& origPaint) {
187        paint = origPaint;
188        if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
189            glyphIDs = (uint16_t*)text;
190            count = byteLength >> 1;
191        } else {
192            storage.reset(byteLength); // ensures space for one glyph per ID given UTF8 encoding.
193            glyphIDs = storage.get();
194            count = paint.textToGlyphs(text, byteLength, storage.get());
195            paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
196        }
197    }
198
199    SkPaint paint;
200    uint16_t* glyphIDs;
201    int count;
202private:
203    SkAutoSTMalloc<32, uint16_t> storage;
204};
205
206void SkiaCanvasProxy::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
207        const SkPaint& origPaint) {
208    // convert to glyphIDs if necessary
209    GlyphIDConverter glyphs(text, byteLength, origPaint);
210
211    // compute the glyph positions
212    SkAutoSTMalloc<32, SkPoint> pointStorage(glyphs.count);
213    SkAutoSTMalloc<32, SkScalar> glyphWidths(glyphs.count);
214    glyphs.paint.getTextWidths(glyphs.glyphIDs, glyphs.count << 1, glyphWidths.get());
215
216    // compute conservative bounds
217    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
218    //       but even more conservative bounds if this  is too slow.
219    SkRect bounds;
220    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
221
222    // adjust for non-left alignment
223    if (glyphs.paint.getTextAlign() != SkPaint::kLeft_Align) {
224        SkScalar stop = 0;
225        for (int i = 0; i < glyphs.count; i++) {
226            stop += glyphWidths[i];
227        }
228        if (glyphs.paint.getTextAlign() == SkPaint::kCenter_Align) {
229            stop = SkScalarHalf(stop);
230        }
231        if (glyphs.paint.isVerticalText()) {
232            y -= stop;
233        } else {
234            x -= stop;
235        }
236    }
237
238    // setup the first glyph position and adjust bounds if needed
239    int xBaseline = 0;
240    int yBaseline = 0;
241    if (mCanvas->drawTextAbsolutePos()) {
242        bounds.offset(x,y);
243        xBaseline = x;
244        yBaseline = y;
245    }
246    pointStorage[0].set(xBaseline, yBaseline);
247
248    // setup the remaining glyph positions
249    if (glyphs.paint.isVerticalText()) {
250        for (int i = 1; i < glyphs.count; i++) {
251            pointStorage[i].set(xBaseline, glyphWidths[i-1] + pointStorage[i-1].fY);
252        }
253    } else {
254        for (int i = 1; i < glyphs.count; i++) {
255            pointStorage[i].set(glyphWidths[i-1] + pointStorage[i-1].fX, yBaseline);
256        }
257    }
258
259    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
260    mCanvas->drawText(glyphs.glyphIDs, &pointStorage[0].fX, glyphs.count, glyphs.paint,
261                      x, y, bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
262}
263
264void SkiaCanvasProxy::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
265        const SkPaint& origPaint) {
266    // convert to glyphIDs if necessary
267    GlyphIDConverter glyphs(text, byteLength, origPaint);
268
269    // convert to relative positions if necessary
270    int x, y;
271    const SkPoint* posArray;
272    SkAutoSTMalloc<32, SkPoint> pointStorage;
273    if (mCanvas->drawTextAbsolutePos()) {
274        x = 0;
275        y = 0;
276        posArray = pos;
277    } else {
278        x = pos[0].fX;
279        y = pos[0].fY;
280        posArray = pointStorage.reset(glyphs.count);
281        for (int i = 0; i < glyphs.count; i++) {
282            pointStorage[i].fX = pos[i].fX- x;
283            pointStorage[i].fY = pos[i].fY- y;
284        }
285    }
286
287    // compute conservative bounds
288    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
289    //       but even more conservative bounds if this  is too slow.
290    SkRect bounds;
291    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
292    bounds.offset(x, y);
293
294    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
295    mCanvas->drawText(glyphs.glyphIDs, &posArray[0].fX, glyphs.count, glyphs.paint, x, y,
296                      bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
297}
298
299void SkiaCanvasProxy::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
300        SkScalar constY, const SkPaint& paint) {
301    const size_t pointCount = byteLength >> 1;
302    SkAutoSTMalloc<32, SkPoint> storage(pointCount);
303    SkPoint* pts = storage.get();
304    for (size_t i = 0; i < pointCount; i++) {
305        pts[i].set(xpos[i], constY);
306    }
307    this->onDrawPosText(text, byteLength, pts, paint);
308}
309
310void SkiaCanvasProxy::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
311        const SkMatrix* matrix, const SkPaint& origPaint) {
312    // convert to glyphIDs if necessary
313    GlyphIDConverter glyphs(text, byteLength, origPaint);
314    mCanvas->drawTextOnPath(glyphs.glyphIDs, glyphs.count, path, 0, 0, glyphs.paint);
315}
316
317void SkiaCanvasProxy::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
318        const SkPaint& paint) {
319    SkDEBUGFAIL("SkiaCanvasProxy::onDrawTextBlob is not supported");
320}
321
322void SkiaCanvasProxy::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
323        const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
324    if (mFilterHwuiCalls) {
325        return;
326    }
327    SkPatchUtils::VertexData data;
328
329    SkMatrix matrix;
330    mCanvas->getMatrix(&matrix);
331    SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix);
332
333    // It automatically adjusts lodX and lodY in case it exceeds the number of indices.
334    // If it fails to generate the vertices, then we do not draw.
335    if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) {
336        this->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints,
337                           data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount,
338                           paint);
339    }
340}
341
342void SkiaCanvasProxy::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) {
343    mCanvas->clipRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, op);
344}
345
346void SkiaCanvasProxy::onClipRRect(const SkRRect& roundRect, SkRegion::Op op, ClipEdgeStyle) {
347    SkPath path;
348    path.addRRect(roundRect);
349    mCanvas->clipPath(&path, op);
350}
351
352void SkiaCanvasProxy::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) {
353    mCanvas->clipPath(&path, op);
354}
355
356void SkiaCanvasProxy::onClipRegion(const SkRegion& region, SkRegion::Op op) {
357    mCanvas->clipRegion(&region, op);
358}
359
360}; // namespace uirenderer
361}; // namespace android
362