android_view_GLES20Canvas.cpp revision e2d345ea67e2960b37bfdc0fc8626d1bfa747404 
1/*
2 * Copyright (C) 2010 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#define LOG_TAG "OpenGLRenderer"
18
19#include "jni.h"
20#include <nativehelper/JNIHelp.h>
21#include <android_runtime/AndroidRuntime.h>
22#include <utils/ResourceTypes.h>
23
24#include <SkBitmap.h>
25#include <SkCanvas.h>
26#include <SkMatrix.h>
27#include <SkPaint.h>
28#include <SkRegion.h>
29#include <SkScalerContext.h>
30#include <SkTemplates.h>
31#include <SkXfermode.h>
32
33#include <OpenGLDebugRenderer.h>
34#include <OpenGLRenderer.h>
35#include <SkiaShader.h>
36#include <SkiaColorFilter.h>
37#include <Rect.h>
38
39#include "TextLayout.h"
40
41namespace android {
42
43using namespace uirenderer;
44
45/**
46 * Note: OpenGLRenderer JNI layer is generated and compiled only on supported
47 *       devices. This means all the logic must be compiled only when the
48 *       preprocessor variable USE_OPENGL_RENDERER is defined.
49 */
50#ifdef USE_OPENGL_RENDERER
51
52#define DEBUG_RENDERER 0
53
54// ----------------------------------------------------------------------------
55// Java APIs
56// ----------------------------------------------------------------------------
57
58static struct {
59    jclass clazz;
60    jmethodID set;
61} gRectClassInfo;
62
63// ----------------------------------------------------------------------------
64// Constructors
65// ----------------------------------------------------------------------------
66
67static OpenGLRenderer* android_view_GLES20Canvas_createRenderer(JNIEnv* env, jobject canvas) {
68#if DEBUG_RENDERER
69    return new OpenGLDebugRenderer;
70#else
71    return new OpenGLRenderer;
72#endif
73}
74
75static void android_view_GLES20Canvas_destroyRenderer(JNIEnv* env, jobject canvas,
76        OpenGLRenderer* renderer) {
77    delete renderer;
78}
79
80// ----------------------------------------------------------------------------
81// Setup
82// ----------------------------------------------------------------------------
83
84static void android_view_GLES20Canvas_setViewport(JNIEnv* env, jobject canvas,
85        OpenGLRenderer* renderer, jint width, jint height) {
86    renderer->setViewport(width, height);
87}
88
89static void android_view_GLES20Canvas_prepare(JNIEnv* env, jobject canvas,
90        OpenGLRenderer* renderer) {
91    renderer->prepare();
92}
93
94static void android_view_GLES20Canvas_finish(JNIEnv* env, jobject canvas,
95        OpenGLRenderer* renderer) {
96    renderer->finish();
97}
98
99static void android_view_GLES20Canvas_acquireContext(JNIEnv* env, jobject canvas,
100        OpenGLRenderer* renderer) {
101    renderer->acquireContext();
102}
103
104static void android_view_GLES20Canvas_releaseContext(JNIEnv* env, jobject canvas,
105        OpenGLRenderer* renderer) {
106    renderer->releaseContext();
107}
108
109// ----------------------------------------------------------------------------
110// State
111// ----------------------------------------------------------------------------
112
113static jint android_view_GLES20Canvas_save(JNIEnv* env, jobject canvas, OpenGLRenderer* renderer,
114        jint flags) {
115    return renderer->save(flags);
116}
117
118static jint android_view_GLES20Canvas_getSaveCount(JNIEnv* env, jobject canvas,
119        OpenGLRenderer* renderer) {
120    return renderer->getSaveCount();
121}
122
123static void android_view_GLES20Canvas_restore(JNIEnv* env, jobject canvas,
124        OpenGLRenderer* renderer) {
125    renderer->restore();
126}
127
128static void android_view_GLES20Canvas_restoreToCount(JNIEnv* env, jobject canvas,
129        OpenGLRenderer* renderer, jint saveCount) {
130    renderer->restoreToCount(saveCount);
131}
132
133// ----------------------------------------------------------------------------
134// Layers
135// ----------------------------------------------------------------------------
136
137static jint android_view_GLES20Canvas_saveLayer(JNIEnv* env, jobject canvas,
138        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
139        SkPaint* paint, jint saveFlags) {
140    return renderer->saveLayer(left, top, right, bottom, paint, saveFlags);
141}
142
143static jint android_view_GLES20Canvas_saveLayerAlpha(JNIEnv* env, jobject canvas,
144        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
145        jint alpha, jint saveFlags) {
146    return renderer->saveLayerAlpha(left, top, right, bottom, alpha, saveFlags);
147}
148
149// ----------------------------------------------------------------------------
150// Clipping
151// ----------------------------------------------------------------------------
152
153static bool android_view_GLES20Canvas_quickReject(JNIEnv* env, jobject canvas,
154        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
155        SkCanvas::EdgeType edge) {
156    return renderer->quickReject(left, top, right, bottom);
157}
158
159static bool android_view_GLES20Canvas_clipRectF(JNIEnv* env, jobject canvas,
160        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
161        SkRegion::Op op) {
162    return renderer->clipRect(left, top, right, bottom, op);
163}
164
165static bool android_view_GLES20Canvas_clipRect(JNIEnv* env, jobject canvas,
166        OpenGLRenderer* renderer, jint left, jint top, jint right, jint bottom,
167        SkRegion::Op op) {
168    return renderer->clipRect(float(left), float(top), float(right), float(bottom), op);
169}
170
171static bool android_view_GLES20Canvas_getClipBounds(JNIEnv* env, jobject canvas,
172        OpenGLRenderer* renderer, jobject rect) {
173    const android::uirenderer::Rect& bounds(renderer->getClipBounds());
174
175    env->CallVoidMethod(rect, gRectClassInfo.set,
176            int(bounds.left), int(bounds.top), int(bounds.right), int(bounds.bottom));
177
178    return !bounds.isEmpty();
179}
180
181// ----------------------------------------------------------------------------
182// Transforms
183// ----------------------------------------------------------------------------
184
185static void android_view_GLES20Canvas_translate(JNIEnv* env, jobject canvas,
186        OpenGLRenderer* renderer, jfloat dx, jfloat dy) {
187    renderer->translate(dx, dy);
188}
189
190static void android_view_GLES20Canvas_rotate(JNIEnv* env, jobject canvas,
191        OpenGLRenderer* renderer, jfloat degrees) {
192    renderer->rotate(degrees);
193}
194
195static void android_view_GLES20Canvas_scale(JNIEnv* env, jobject canvas,
196        OpenGLRenderer* renderer, jfloat sx, jfloat sy) {
197    renderer->scale(sx, sy);
198}
199
200static void android_view_GLES20Canvas_setMatrix(JNIEnv* env, jobject canvas,
201        OpenGLRenderer* renderer, SkMatrix* matrix) {
202    renderer->setMatrix(matrix);
203}
204
205static void android_view_GLES20Canvas_getMatrix(JNIEnv* env, jobject canvas,
206        OpenGLRenderer* renderer, SkMatrix* matrix) {
207    renderer->getMatrix(matrix);
208}
209
210static void android_view_GLES20Canvas_concatMatrix(JNIEnv* env, jobject canvas,
211        OpenGLRenderer* renderer, SkMatrix* matrix) {
212    renderer->concatMatrix(matrix);
213}
214
215// ----------------------------------------------------------------------------
216// Drawing
217// ----------------------------------------------------------------------------
218
219static void android_view_GLES20Canvas_drawBitmap(JNIEnv* env, jobject canvas,
220        OpenGLRenderer* renderer, SkBitmap* bitmap, float left, float top, SkPaint* paint) {
221    renderer->drawBitmap(bitmap, left, top, paint);
222}
223
224static void android_view_GLES20Canvas_drawBitmapRect(JNIEnv* env, jobject canvas,
225        OpenGLRenderer* renderer, SkBitmap* bitmap,
226        float srcLeft, float srcTop, float srcRight, float srcBottom,
227        float dstLeft, float dstTop, float dstRight, float dstBottom, SkPaint* paint) {
228    renderer->drawBitmap(bitmap, srcLeft, srcTop, srcRight, srcBottom,
229            dstLeft, dstTop, dstRight, dstBottom, paint);
230}
231
232static void android_view_GLES20Canvas_drawBitmapMatrix(JNIEnv* env, jobject canvas,
233        OpenGLRenderer* renderer, SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
234    renderer->drawBitmap(bitmap, matrix, paint);
235}
236
237static void android_view_GLES20Canvas_drawPatch(JNIEnv* env, jobject canvas,
238        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray chunks,
239        float left, float top, float right, float bottom, SkPaint* paint) {
240    jbyte* storage = env->GetByteArrayElements(chunks, NULL);
241    Res_png_9patch* patch = reinterpret_cast<Res_png_9patch*>(storage);
242    Res_png_9patch::deserialize(patch);
243
244    renderer->drawPatch(bitmap, patch, left, top, right, bottom, paint);
245
246    env->ReleaseByteArrayElements(chunks, storage, 0);
247}
248
249static void android_view_GLES20Canvas_drawColor(JNIEnv* env, jobject canvas,
250        OpenGLRenderer* renderer, jint color, SkXfermode::Mode mode) {
251    renderer->drawColor(color, mode);
252}
253
254static void android_view_GLES20Canvas_drawRect(JNIEnv* env, jobject canvas,
255        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
256        SkPaint* paint) {
257    renderer->drawRect(left, top, right, bottom, paint);
258}
259
260static void android_view_GLES20Canvas_drawRects(JNIEnv* env, jobject canvas,
261        OpenGLRenderer* renderer, SkRegion* region, SkPaint* paint) {
262    SkRegion::Iterator it(*region);
263    while (!it.done()) {
264        const SkIRect& r = it.rect();
265        renderer->drawRect(r.fLeft, r.fTop, r.fRight, r.fBottom, paint);
266        it.next();
267    }
268}
269
270static void android_view_GLES20Canvas_drawPath(JNIEnv* env, jobject canvas,
271        OpenGLRenderer* renderer, SkPath* path, SkPaint* paint) {
272    renderer->drawPath(path, paint);
273}
274
275static void android_view_GLES20Canvas_drawLines(JNIEnv* env, jobject canvas,
276        OpenGLRenderer* renderer, jfloatArray points, jint offset, jint count, SkPaint* paint) {
277    jfloat* storage = env->GetFloatArrayElements(points, NULL);
278
279    renderer->drawLines(storage + offset, count, paint);
280
281    env->ReleaseFloatArrayElements(points, storage, 0);
282}
283
284// ----------------------------------------------------------------------------
285// Shaders and color filters
286// ----------------------------------------------------------------------------
287
288static void android_view_GLES20Canvas_resetModifiers(JNIEnv* env, jobject canvas,
289        OpenGLRenderer* renderer) {
290    renderer->resetShader();
291    renderer->resetColorFilter();
292    renderer->resetShadow();
293}
294
295static void android_view_GLES20Canvas_setupShader(JNIEnv* env, jobject canvas,
296        OpenGLRenderer* renderer, SkiaShader* shader) {
297    renderer->setupShader(shader);
298}
299
300static void android_view_GLES20Canvas_setupColorFilter(JNIEnv* env, jobject canvas,
301        OpenGLRenderer* renderer, SkiaColorFilter* filter) {
302    renderer->setupColorFilter(filter);
303}
304
305static void android_view_GLES20Canvas_setupShadow(JNIEnv* env, jobject canvas,
306        OpenGLRenderer* renderer, jfloat radius, jfloat dx, jfloat dy, jint color) {
307    renderer->setupShadow(radius, dx, dy, color);
308}
309
310// ----------------------------------------------------------------------------
311// Text
312// ----------------------------------------------------------------------------
313
314static void renderText(OpenGLRenderer* renderer, const jchar* text, int count,
315        jfloat x, jfloat y, int flags, SkPaint* paint) {
316    const jchar *workText;
317    jchar* buffer = NULL;
318    int32_t workBytes;
319    if (TextLayout::prepareText(paint, text, count, flags, &workText, &workBytes, &buffer)) {
320        renderer->drawText((const char*) workText, workBytes, count, x, y, paint);
321        free(buffer);
322    }
323}
324
325static void renderTextRun(OpenGLRenderer* renderer, const jchar* text,
326        jint start, jint count, jint contextCount, jfloat x, jfloat y,
327        int flags, SkPaint* paint) {
328    uint8_t rtl = flags & 0x1;
329    if (rtl) {
330        SkAutoSTMalloc<80, jchar> buffer(contextCount);
331        jchar* shaped = buffer.get();
332        if (TextLayout::prepareRtlTextRun(text, start, count, contextCount, shaped)) {
333            renderer->drawText((const char*) shaped, count << 1, count, x, y, paint);
334        } else {
335            LOGW("drawTextRun error");
336        }
337    } else {
338        renderer->drawText((const char*) (text + start), count << 1, count, x, y, paint);
339    }
340}
341
342static void android_view_GLES20Canvas_drawTextArray(JNIEnv* env, jobject canvas,
343        OpenGLRenderer* renderer, jcharArray text, int index, int count,
344        jfloat x, jfloat y, int flags, SkPaint* paint) {
345    jchar* textArray = env->GetCharArrayElements(text, NULL);
346    renderText(renderer, textArray + index, count, x, y, flags, paint);
347    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
348}
349
350static void android_view_GLES20Canvas_drawText(JNIEnv* env, jobject canvas,
351        OpenGLRenderer* renderer, jstring text, int start, int end,
352        jfloat x, jfloat y, int flags, SkPaint* paint) {
353    const jchar* textArray = env->GetStringChars(text, NULL);
354    renderText(renderer, textArray + start, end - start, x, y, flags, paint);
355    env->ReleaseStringChars(text, textArray);
356}
357
358static void android_view_GLES20Canvas_drawTextRunArray(JNIEnv* env, jobject canvas,
359        OpenGLRenderer* renderer, jcharArray text, int index, int count,
360        int contextIndex, int contextCount, jfloat x, jfloat y, int dirFlags,
361        SkPaint* paint) {
362    jchar* textArray = env->GetCharArrayElements(text, NULL);
363    renderTextRun(renderer, textArray + contextIndex, index - contextIndex,
364            count, contextCount, x, y, dirFlags, paint);
365    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
366 }
367
368static void android_view_GLES20Canvas_drawTextRun(JNIEnv* env, jobject canvas,
369        OpenGLRenderer* renderer, jstring text, int start, int end,
370        int contextStart, int contextEnd, jfloat x, jfloat y, int dirFlags,
371        SkPaint* paint) {
372    const jchar* textArray = env->GetStringChars(text, NULL);
373    jint count = end - start;
374    jint contextCount = contextEnd - contextStart;
375    renderTextRun(renderer, textArray + contextStart, start - contextStart,
376            count, contextCount, x, y, dirFlags, paint);
377    env->ReleaseStringChars(text, textArray);
378}
379
380#endif // USE_OPENGL_RENDERER
381
382// ----------------------------------------------------------------------------
383// Common
384// ----------------------------------------------------------------------------
385
386static jboolean android_view_GLES20Canvas_isAvailable(JNIEnv* env, jobject clazz) {
387#ifdef USE_OPENGL_RENDERER
388    return JNI_TRUE;
389#else
390    return JNI_FALSE;
391#endif
392}
393
394// ----------------------------------------------------------------------------
395// JNI Glue
396// ----------------------------------------------------------------------------
397
398const char* const kClassPathName = "android/view/GLES20Canvas";
399
400static JNINativeMethod gMethods[] = {
401    { "nIsAvailable",       "()Z",             (void*) android_view_GLES20Canvas_isAvailable },
402
403#ifdef USE_OPENGL_RENDERER
404    { "nCreateRenderer",    "()I",             (void*) android_view_GLES20Canvas_createRenderer },
405    { "nDestroyRenderer",   "(I)V",            (void*) android_view_GLES20Canvas_destroyRenderer },
406    { "nSetViewport",       "(III)V",          (void*) android_view_GLES20Canvas_setViewport },
407    { "nPrepare",           "(I)V",            (void*) android_view_GLES20Canvas_prepare },
408    { "nFinish",            "(I)V",            (void*) android_view_GLES20Canvas_finish },
409    { "nAcquireContext",    "(I)V",            (void*) android_view_GLES20Canvas_acquireContext },
410    { "nReleaseContext",    "(I)V",            (void*) android_view_GLES20Canvas_releaseContext },
411
412    { "nSave",              "(II)I",           (void*) android_view_GLES20Canvas_save },
413    { "nRestore",           "(I)V",            (void*) android_view_GLES20Canvas_restore },
414    { "nRestoreToCount",    "(II)V",           (void*) android_view_GLES20Canvas_restoreToCount },
415    { "nGetSaveCount",      "(I)I",            (void*) android_view_GLES20Canvas_getSaveCount },
416
417    { "nSaveLayer",         "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayer },
418    { "nSaveLayerAlpha",    "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayerAlpha },
419
420    { "nQuickReject",       "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_quickReject },
421    { "nClipRect",          "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_clipRectF },
422    { "nClipRect",          "(IIIIII)Z",       (void*) android_view_GLES20Canvas_clipRect },
423
424    { "nTranslate",         "(IFF)V",          (void*) android_view_GLES20Canvas_translate },
425    { "nRotate",            "(IF)V",           (void*) android_view_GLES20Canvas_rotate },
426    { "nScale",             "(IFF)V",          (void*) android_view_GLES20Canvas_scale },
427
428    { "nSetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_setMatrix },
429    { "nGetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_getMatrix },
430    { "nConcatMatrix",      "(II)V",           (void*) android_view_GLES20Canvas_concatMatrix },
431
432    { "nDrawBitmap",        "(IIFFI)V",        (void*) android_view_GLES20Canvas_drawBitmap },
433    { "nDrawBitmap",        "(IIFFFFFFFFI)V",  (void*) android_view_GLES20Canvas_drawBitmapRect },
434    { "nDrawBitmap",        "(IIII)V",         (void*) android_view_GLES20Canvas_drawBitmapMatrix },
435    { "nDrawPatch",         "(II[BFFFFI)V",    (void*) android_view_GLES20Canvas_drawPatch },
436    { "nDrawColor",         "(III)V",          (void*) android_view_GLES20Canvas_drawColor },
437    { "nDrawRect",          "(IFFFFI)V",       (void*) android_view_GLES20Canvas_drawRect },
438    { "nDrawRects",         "(III)V",          (void*) android_view_GLES20Canvas_drawRects },
439    { "nDrawPath",          "(III)V",          (void*) android_view_GLES20Canvas_drawPath },
440    { "nDrawLines",         "(I[FIII)V",       (void*) android_view_GLES20Canvas_drawLines },
441
442    { "nResetModifiers",    "(I)V",            (void*) android_view_GLES20Canvas_resetModifiers },
443    { "nSetupShader",       "(II)V",           (void*) android_view_GLES20Canvas_setupShader },
444    { "nSetupColorFilter",  "(II)V",           (void*) android_view_GLES20Canvas_setupColorFilter },
445    { "nSetupShadow",       "(IFFFI)V",        (void*) android_view_GLES20Canvas_setupShadow },
446
447    { "nDrawText",          "(I[CIIFFII)V",    (void*) android_view_GLES20Canvas_drawTextArray },
448    { "nDrawText",          "(ILjava/lang/String;IIFFII)V",
449            (void*) android_view_GLES20Canvas_drawText },
450
451    { "nDrawTextRun",       "(I[CIIIIFFII)V",  (void*) android_view_GLES20Canvas_drawTextRunArray },
452    { "nDrawTextRun",       "(ILjava/lang/String;IIIIFFII)V",
453            (void*) android_view_GLES20Canvas_drawTextRun },
454
455    { "nGetClipBounds",     "(ILandroid/graphics/Rect;)Z",
456            (void*) android_view_GLES20Canvas_getClipBounds },
457#endif
458};
459
460#ifdef USE_OPENGL_RENDERER
461    #define FIND_CLASS(var, className) \
462            var = env->FindClass(className); \
463            LOG_FATAL_IF(! var, "Unable to find class " className); \
464            var = jclass(env->NewGlobalRef(var));
465
466    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
467            var = env->GetMethodID(clazz, methodName, methodDescriptor); \
468            LOG_FATAL_IF(! var, "Unable to find method " methodName);
469#else
470    #define FIND_CLASS(var, className)
471    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor)
472#endif
473
474int register_android_view_GLES20Canvas(JNIEnv* env) {
475    FIND_CLASS(gRectClassInfo.clazz, "android/graphics/Rect");
476    GET_METHOD_ID(gRectClassInfo.set, gRectClassInfo.clazz, "set", "(IIII)V");
477
478    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
479}
480
481};
482