android_view_GLES20Canvas.cpp revision b025b9c8b4efefadb01937db61a1f8ee7d2452bf 
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 <OpenGLRenderer.h>
34#include <SkiaShader.h>
35#include <SkiaColorFilter.h>
36#include <Rect.h>
37
38#include "TextLayout.h"
39
40namespace android {
41
42using namespace uirenderer;
43
44/**
45 * Note: OpenGLRenderer JNI layer is generated and compiled only on supported
46 *       devices. This means all the logic must be compiled only when the
47 *       preprocessor variable USE_OPENGL_RENDERER is defined.
48 */
49#ifdef USE_OPENGL_RENDERER
50
51// ----------------------------------------------------------------------------
52// Java APIs
53// ----------------------------------------------------------------------------
54
55static struct {
56    jclass clazz;
57    jmethodID set;
58} gRectClassInfo;
59
60// ----------------------------------------------------------------------------
61// Constructors
62// ----------------------------------------------------------------------------
63
64static OpenGLRenderer* android_view_GLES20Canvas_createRenderer(JNIEnv* env, jobject canvas) {
65    return new OpenGLRenderer;
66}
67
68static void android_view_GLES20Canvas_destroyRenderer(JNIEnv* env, jobject canvas,
69        OpenGLRenderer* renderer) {
70    delete renderer;
71}
72
73// ----------------------------------------------------------------------------
74// Setup
75// ----------------------------------------------------------------------------
76
77static void android_view_GLES20Canvas_setViewport(JNIEnv* env, jobject canvas,
78        OpenGLRenderer* renderer, jint width, jint height) {
79    renderer->setViewport(width, height);
80}
81
82static void android_view_GLES20Canvas_prepare(JNIEnv* env, jobject canvas,
83        OpenGLRenderer* renderer) {
84    renderer->prepare();
85}
86
87static void android_view_GLES20Canvas_finish(JNIEnv* env, jobject canvas,
88        OpenGLRenderer* renderer) {
89    renderer->finish();
90}
91
92static void android_view_GLES20Canvas_acquireContext(JNIEnv* env, jobject canvas,
93        OpenGLRenderer* renderer) {
94    renderer->acquireContext();
95}
96
97static void android_view_GLES20Canvas_releaseContext(JNIEnv* env, jobject canvas,
98        OpenGLRenderer* renderer) {
99    renderer->releaseContext();
100}
101
102// ----------------------------------------------------------------------------
103// State
104// ----------------------------------------------------------------------------
105
106static jint android_view_GLES20Canvas_save(JNIEnv* env, jobject canvas, OpenGLRenderer* renderer,
107        jint flags) {
108    return renderer->save(flags);
109}
110
111static jint android_view_GLES20Canvas_getSaveCount(JNIEnv* env, jobject canvas,
112        OpenGLRenderer* renderer) {
113    return renderer->getSaveCount();
114}
115
116static void android_view_GLES20Canvas_restore(JNIEnv* env, jobject canvas,
117        OpenGLRenderer* renderer) {
118    renderer->restore();
119}
120
121static void android_view_GLES20Canvas_restoreToCount(JNIEnv* env, jobject canvas,
122        OpenGLRenderer* renderer, jint saveCount) {
123    renderer->restoreToCount(saveCount);
124}
125
126// ----------------------------------------------------------------------------
127// Layers
128// ----------------------------------------------------------------------------
129
130static jint android_view_GLES20Canvas_saveLayer(JNIEnv* env, jobject canvas,
131        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
132        SkPaint* paint, jint saveFlags) {
133    return renderer->saveLayer(left, top, right, bottom, paint, saveFlags);
134}
135
136static jint android_view_GLES20Canvas_saveLayerAlpha(JNIEnv* env, jobject canvas,
137        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
138        jint alpha, jint saveFlags) {
139    return renderer->saveLayerAlpha(left, top, right, bottom, alpha, saveFlags);
140}
141
142// ----------------------------------------------------------------------------
143// Clipping
144// ----------------------------------------------------------------------------
145
146static bool android_view_GLES20Canvas_quickReject(JNIEnv* env, jobject canvas,
147        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
148        SkCanvas::EdgeType edge) {
149    return renderer->quickReject(left, top, right, bottom);
150}
151
152static bool android_view_GLES20Canvas_clipRectF(JNIEnv* env, jobject canvas,
153        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
154        SkRegion::Op op) {
155    return renderer->clipRect(left, top, right, bottom, op);
156}
157
158static bool android_view_GLES20Canvas_clipRect(JNIEnv* env, jobject canvas,
159        OpenGLRenderer* renderer, jint left, jint top, jint right, jint bottom,
160        SkRegion::Op op) {
161    return renderer->clipRect(float(left), float(top), float(right), float(bottom), op);
162}
163
164static bool android_view_GLES20Canvas_getClipBounds(JNIEnv* env, jobject canvas,
165        OpenGLRenderer* renderer, jobject rect) {
166    const android::uirenderer::Rect& bounds(renderer->getClipBounds());
167
168    env->CallVoidMethod(rect, gRectClassInfo.set,
169            int(bounds.left), int(bounds.top), int(bounds.right), int(bounds.bottom));
170
171    return !bounds.isEmpty();
172}
173
174// ----------------------------------------------------------------------------
175// Transforms
176// ----------------------------------------------------------------------------
177
178static void android_view_GLES20Canvas_translate(JNIEnv* env, jobject canvas,
179        OpenGLRenderer* renderer, jfloat dx, jfloat dy) {
180    renderer->translate(dx, dy);
181}
182
183static void android_view_GLES20Canvas_rotate(JNIEnv* env, jobject canvas,
184        OpenGLRenderer* renderer, jfloat degrees) {
185    renderer->rotate(degrees);
186}
187
188static void android_view_GLES20Canvas_scale(JNIEnv* env, jobject canvas,
189        OpenGLRenderer* renderer, jfloat sx, jfloat sy) {
190    renderer->scale(sx, sy);
191}
192
193static void android_view_GLES20Canvas_setMatrix(JNIEnv* env, jobject canvas,
194        OpenGLRenderer* renderer, SkMatrix* matrix) {
195    renderer->setMatrix(matrix);
196}
197
198static void android_view_GLES20Canvas_getMatrix(JNIEnv* env, jobject canvas,
199        OpenGLRenderer* renderer, SkMatrix* matrix) {
200    renderer->getMatrix(matrix);
201}
202
203static void android_view_GLES20Canvas_concatMatrix(JNIEnv* env, jobject canvas,
204        OpenGLRenderer* renderer, SkMatrix* matrix) {
205    renderer->concatMatrix(matrix);
206}
207
208// ----------------------------------------------------------------------------
209// Drawing
210// ----------------------------------------------------------------------------
211
212static void android_view_GLES20Canvas_drawBitmap(JNIEnv* env, jobject canvas,
213        OpenGLRenderer* renderer, SkBitmap* bitmap, float left, float top, SkPaint* paint) {
214    renderer->drawBitmap(bitmap, left, top, paint);
215}
216
217static void android_view_GLES20Canvas_drawBitmapRect(JNIEnv* env, jobject canvas,
218        OpenGLRenderer* renderer, SkBitmap* bitmap,
219        float srcLeft, float srcTop, float srcRight, float srcBottom,
220        float dstLeft, float dstTop, float dstRight, float dstBottom, SkPaint* paint) {
221    renderer->drawBitmap(bitmap, srcLeft, srcTop, srcRight, srcBottom,
222            dstLeft, dstTop, dstRight, dstBottom, paint);
223}
224
225static void android_view_GLES20Canvas_drawBitmapMatrix(JNIEnv* env, jobject canvas,
226        OpenGLRenderer* renderer, SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
227    renderer->drawBitmap(bitmap, matrix, paint);
228}
229
230static void android_view_GLES20Canvas_drawPatch(JNIEnv* env, jobject canvas,
231        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray chunks,
232        float left, float top, float right, float bottom, SkPaint* paint) {
233    jbyte* storage = env->GetByteArrayElements(chunks, NULL);
234    Res_png_9patch* patch = reinterpret_cast<Res_png_9patch*>(storage);
235    Res_png_9patch::deserialize(patch);
236
237    renderer->drawPatch(bitmap, patch, left, top, right, bottom, paint);
238
239    env->ReleaseByteArrayElements(chunks, storage, 0);
240}
241
242static void android_view_GLES20Canvas_drawColor(JNIEnv* env, jobject canvas,
243        OpenGLRenderer* renderer, jint color, SkXfermode::Mode mode) {
244    renderer->drawColor(color, mode);
245}
246
247static void android_view_GLES20Canvas_drawRect(JNIEnv* env, jobject canvas,
248        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
249        SkPaint* paint) {
250    renderer->drawRect(left, top, right, bottom, paint);
251}
252
253static void android_view_GLES20Canvas_drawRects(JNIEnv* env, jobject canvas,
254        OpenGLRenderer* renderer, SkRegion* region, SkPaint* paint) {
255    SkRegion::Iterator it(*region);
256    while (!it.done()) {
257        const SkIRect& r = it.rect();
258        renderer->drawRect(r.fLeft, r.fTop, r.fRight, r.fBottom, paint);
259        it.next();
260    }
261}
262
263static void android_view_GLES20Canvas_drawPath(JNIEnv* env, jobject canvas,
264        OpenGLRenderer* renderer, SkPath* path, SkPaint* paint) {
265    renderer->drawPath(path, paint);
266}
267
268// ----------------------------------------------------------------------------
269// Shaders and color filters
270// ----------------------------------------------------------------------------
271
272static void android_view_GLES20Canvas_resetModifiers(JNIEnv* env, jobject canvas,
273        OpenGLRenderer* renderer) {
274    renderer->resetShader();
275    renderer->resetColorFilter();
276    renderer->resetShadow();
277}
278
279static void android_view_GLES20Canvas_setupShader(JNIEnv* env, jobject canvas,
280        OpenGLRenderer* renderer, SkiaShader* shader) {
281    renderer->setupShader(shader);
282}
283
284static void android_view_GLES20Canvas_setupColorFilter(JNIEnv* env, jobject canvas,
285        OpenGLRenderer* renderer, SkiaColorFilter* filter) {
286    renderer->setupColorFilter(filter);
287}
288
289static void android_view_GLES20Canvas_setupShadow(JNIEnv* env, jobject canvas,
290        OpenGLRenderer* renderer, jfloat radius, jfloat dx, jfloat dy, jint color) {
291    renderer->setupShadow(radius, dx, dy, color);
292}
293
294// ----------------------------------------------------------------------------
295// Text
296// ----------------------------------------------------------------------------
297
298static void renderText(OpenGLRenderer* renderer, const jchar* text, int count,
299        jfloat x, jfloat y, int flags, SkPaint* paint) {
300    const jchar *workText;
301    jchar* buffer = NULL;
302    int32_t workBytes;
303    if (TextLayout::prepareText(paint, text, count, flags, &workText, &workBytes, &buffer)) {
304        renderer->drawText((const char*) workText, workBytes, count, x, y, paint);
305        free(buffer);
306    }
307}
308
309static void renderTextRun(OpenGLRenderer* renderer, const jchar* text,
310        jint start, jint count, jint contextCount, jfloat x, jfloat y,
311        int flags, SkPaint* paint) {
312    uint8_t rtl = flags & 0x1;
313    if (rtl) {
314        SkAutoSTMalloc<80, jchar> buffer(contextCount);
315        jchar* shaped = buffer.get();
316        if (TextLayout::prepareRtlTextRun(text, start, count, contextCount, shaped)) {
317            renderer->drawText((const char*) shaped, count << 1, count, x, y, paint);
318        } else {
319            LOGW("drawTextRun error");
320        }
321    } else {
322        renderer->drawText((const char*) (text + start), count << 1, count, x, y, paint);
323    }
324}
325
326static void android_view_GLES20Canvas_drawTextArray(JNIEnv* env, jobject canvas,
327        OpenGLRenderer* renderer, jcharArray text, int index, int count,
328        jfloat x, jfloat y, int flags, SkPaint* paint) {
329    jchar* textArray = env->GetCharArrayElements(text, NULL);
330    renderText(renderer, textArray + index, count, x, y, flags, paint);
331    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
332}
333
334static void android_view_GLES20Canvas_drawText(JNIEnv* env, jobject canvas,
335        OpenGLRenderer* renderer, jstring text, int start, int end,
336        jfloat x, jfloat y, int flags, SkPaint* paint) {
337    const jchar* textArray = env->GetStringChars(text, NULL);
338    renderText(renderer, textArray + start, end - start, x, y, flags, paint);
339    env->ReleaseStringChars(text, textArray);
340}
341
342static void android_view_GLES20Canvas_drawTextRunArray(JNIEnv* env, jobject canvas,
343        OpenGLRenderer* renderer, jcharArray text, int index, int count,
344        int contextIndex, int contextCount, jfloat x, jfloat y, int dirFlags,
345        SkPaint* paint) {
346    jchar* textArray = env->GetCharArrayElements(text, NULL);
347    renderTextRun(renderer, textArray + contextIndex, index - contextIndex,
348            count, contextCount, x, y, dirFlags, paint);
349    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
350 }
351
352static void android_view_GLES20Canvas_drawTextRun(JNIEnv* env, jobject canvas,
353        OpenGLRenderer* renderer, jstring text, int start, int end,
354        int contextStart, int contextEnd, jfloat x, jfloat y, int dirFlags,
355        SkPaint* paint) {
356    const jchar* textArray = env->GetStringChars(text, NULL);
357    jint count = end - start;
358    jint contextCount = contextEnd - contextStart;
359    renderTextRun(renderer, textArray + contextStart, start - contextStart,
360            count, contextCount, x, y, dirFlags, paint);
361    env->ReleaseStringChars(text, textArray);
362}
363
364#endif // USE_OPENGL_RENDERER
365
366// ----------------------------------------------------------------------------
367// Common
368// ----------------------------------------------------------------------------
369
370static jboolean android_view_GLES20Canvas_isAvailable(JNIEnv* env, jobject clazz) {
371#ifdef USE_OPENGL_RENDERER
372    return JNI_TRUE;
373#else
374    return JNI_FALSE;
375#endif
376}
377
378// ----------------------------------------------------------------------------
379// JNI Glue
380// ----------------------------------------------------------------------------
381
382const char* const kClassPathName = "android/view/GLES20Canvas";
383
384static JNINativeMethod gMethods[] = {
385    { "nIsAvailable",       "()Z",             (void*) android_view_GLES20Canvas_isAvailable },
386
387#ifdef USE_OPENGL_RENDERER
388    { "nCreateRenderer",    "()I",             (void*) android_view_GLES20Canvas_createRenderer },
389    { "nDestroyRenderer",   "(I)V",            (void*) android_view_GLES20Canvas_destroyRenderer },
390    { "nSetViewport",       "(III)V",          (void*) android_view_GLES20Canvas_setViewport },
391    { "nPrepare",           "(I)V",            (void*) android_view_GLES20Canvas_prepare },
392    { "nFinish",            "(I)V",            (void*) android_view_GLES20Canvas_finish },
393    { "nAcquireContext",    "(I)V",            (void*) android_view_GLES20Canvas_acquireContext },
394    { "nReleaseContext",    "(I)V",            (void*) android_view_GLES20Canvas_releaseContext },
395
396    { "nSave",              "(II)I",           (void*) android_view_GLES20Canvas_save },
397    { "nRestore",           "(I)V",            (void*) android_view_GLES20Canvas_restore },
398    { "nRestoreToCount",    "(II)V",           (void*) android_view_GLES20Canvas_restoreToCount },
399    { "nGetSaveCount",      "(I)I",            (void*) android_view_GLES20Canvas_getSaveCount },
400
401    { "nSaveLayer",         "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayer },
402    { "nSaveLayerAlpha",    "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayerAlpha },
403
404    { "nQuickReject",       "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_quickReject },
405    { "nClipRect",          "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_clipRectF },
406    { "nClipRect",          "(IIIIII)Z",       (void*) android_view_GLES20Canvas_clipRect },
407
408    { "nTranslate",         "(IFF)V",          (void*) android_view_GLES20Canvas_translate },
409    { "nRotate",            "(IF)V",           (void*) android_view_GLES20Canvas_rotate },
410    { "nScale",             "(IFF)V",          (void*) android_view_GLES20Canvas_scale },
411
412    { "nSetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_setMatrix },
413    { "nGetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_getMatrix },
414    { "nConcatMatrix",      "(II)V",           (void*) android_view_GLES20Canvas_concatMatrix },
415
416    { "nDrawBitmap",        "(IIFFI)V",        (void*) android_view_GLES20Canvas_drawBitmap },
417    { "nDrawBitmap",        "(IIFFFFFFFFI)V",  (void*) android_view_GLES20Canvas_drawBitmapRect },
418    { "nDrawBitmap",        "(IIII)V",         (void*) android_view_GLES20Canvas_drawBitmapMatrix },
419    { "nDrawPatch",         "(II[BFFFFI)V",    (void*) android_view_GLES20Canvas_drawPatch },
420    { "nDrawColor",         "(III)V",          (void*) android_view_GLES20Canvas_drawColor },
421    { "nDrawRect",          "(IFFFFI)V",       (void*) android_view_GLES20Canvas_drawRect },
422    { "nDrawRects",         "(III)V",          (void*) android_view_GLES20Canvas_drawRects },
423    { "nDrawPath",          "(III)V",          (void*) android_view_GLES20Canvas_drawPath },
424
425    { "nResetModifiers",    "(I)V",            (void*) android_view_GLES20Canvas_resetModifiers },
426    { "nSetupShader",       "(II)V",           (void*) android_view_GLES20Canvas_setupShader },
427    { "nSetupColorFilter",  "(II)V",           (void*) android_view_GLES20Canvas_setupColorFilter },
428    { "nSetupShadow",       "(IFFFI)V",        (void*) android_view_GLES20Canvas_setupShadow },
429
430    { "nDrawText",          "(I[CIIFFII)V",    (void*) android_view_GLES20Canvas_drawTextArray },
431    { "nDrawText",          "(ILjava/lang/String;IIFFII)V",
432            (void*) android_view_GLES20Canvas_drawText },
433
434    { "nDrawTextRun",       "(I[CIIIIFFII)V",  (void*) android_view_GLES20Canvas_drawTextRunArray },
435    { "nDrawTextRun",       "(ILjava/lang/String;IIIIFFII)V",
436            (void*) android_view_GLES20Canvas_drawTextRun },
437
438    { "nGetClipBounds",     "(ILandroid/graphics/Rect;)Z",
439            (void*) android_view_GLES20Canvas_getClipBounds },
440#endif
441};
442
443#ifdef USE_OPENGL_RENDERER
444    #define FIND_CLASS(var, className) \
445            var = env->FindClass(className); \
446            LOG_FATAL_IF(! var, "Unable to find class " className); \
447            var = jclass(env->NewGlobalRef(var));
448
449    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
450            var = env->GetMethodID(clazz, methodName, methodDescriptor); \
451            LOG_FATAL_IF(! var, "Unable to find method " methodName);
452#else
453    #define FIND_CLASS(var, className)
454    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor)
455#endif
456
457int register_android_view_GLES20Canvas(JNIEnv* env) {
458    FIND_CLASS(gRectClassInfo.clazz, "android/graphics/Rect");
459    GET_METHOD_ID(gRectClassInfo.set, gRectClassInfo.clazz, "set", "(IIII)V");
460
461    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
462}
463
464};
465