android_view_GLES20Canvas.cpp revision a48a1a87ba17f20f7006eaab21dcedf86c015c13 
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#include <ui/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// ----------------------------------------------------------------------------
53// Java APIs
54// ----------------------------------------------------------------------------
55
56static struct {
57    jclass clazz;
58    jmethodID set;
59} gRectClassInfo;
60
61// ----------------------------------------------------------------------------
62// Constructors
63// ----------------------------------------------------------------------------
64
65static OpenGLRenderer* android_view_GLES20Canvas_createRenderer(JNIEnv* env, jobject canvas) {
66    return new OpenGLRenderer;
67}
68
69static void android_view_GLES20Canvas_destroyRenderer(JNIEnv* env, jobject canvas,
70        OpenGLRenderer* renderer) {
71    delete renderer;
72}
73
74// ----------------------------------------------------------------------------
75// Setup
76// ----------------------------------------------------------------------------
77
78static void android_view_GLES20Canvas_setViewport(JNIEnv* env, jobject canvas,
79        OpenGLRenderer* renderer, jint width, jint height) {
80    renderer->setViewport(width, height);
81}
82
83static void android_view_GLES20Canvas_prepare(JNIEnv* env, jobject canvas,
84        OpenGLRenderer* renderer) {
85    renderer->prepare();
86}
87
88// ----------------------------------------------------------------------------
89// State
90// ----------------------------------------------------------------------------
91
92static jint android_view_GLES20Canvas_save(JNIEnv* env, jobject canvas, OpenGLRenderer* renderer,
93        jint flags) {
94    return renderer->save(flags);
95}
96
97static jint android_view_GLES20Canvas_getSaveCount(JNIEnv* env, jobject canvas,
98        OpenGLRenderer* renderer) {
99    return renderer->getSaveCount();
100}
101
102static void android_view_GLES20Canvas_restore(JNIEnv* env, jobject canvas,
103        OpenGLRenderer* renderer) {
104    renderer->restore();
105}
106
107static void android_view_GLES20Canvas_restoreToCount(JNIEnv* env, jobject canvas,
108        OpenGLRenderer* renderer, jint saveCount) {
109    renderer->restoreToCount(saveCount);
110}
111
112// ----------------------------------------------------------------------------
113// Layers
114// ----------------------------------------------------------------------------
115
116static jint android_view_GLES20Canvas_saveLayer(JNIEnv* env, jobject canvas,
117        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
118        SkPaint* paint, jint saveFlags) {
119    return renderer->saveLayer(left, top, right, bottom, paint, saveFlags);
120}
121
122static jint android_view_GLES20Canvas_saveLayerAlpha(JNIEnv* env, jobject canvas,
123        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
124        jint alpha, jint saveFlags) {
125    return renderer->saveLayerAlpha(left, top, right, bottom, alpha, saveFlags);
126}
127
128// ----------------------------------------------------------------------------
129// Clipping
130// ----------------------------------------------------------------------------
131
132static bool android_view_GLES20Canvas_quickReject(JNIEnv* env, jobject canvas,
133        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
134        SkCanvas::EdgeType edge) {
135    return renderer->quickReject(left, top, right, bottom);
136}
137
138static bool android_view_GLES20Canvas_clipRectF(JNIEnv* env, jobject canvas,
139        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
140        SkRegion::Op op) {
141    return renderer->clipRect(left, top, right, bottom, op);
142}
143
144static bool android_view_GLES20Canvas_clipRect(JNIEnv* env, jobject canvas,
145        OpenGLRenderer* renderer, jint left, jint top, jint right, jint bottom,
146        SkRegion::Op op) {
147    return renderer->clipRect(float(left), float(top), float(right), float(bottom), op);
148}
149
150static bool android_view_GLES20Canvas_getClipBounds(JNIEnv* env, jobject canvas,
151        OpenGLRenderer* renderer, jobject rect) {
152    const android::uirenderer::Rect& bounds(renderer->getClipBounds());
153
154    env->CallVoidMethod(rect, gRectClassInfo.set,
155            int(bounds.left), int(bounds.top), int(bounds.right), int(bounds.bottom));
156
157    return !bounds.isEmpty();
158}
159
160// ----------------------------------------------------------------------------
161// Transforms
162// ----------------------------------------------------------------------------
163
164static void android_view_GLES20Canvas_translate(JNIEnv* env, jobject canvas,
165        OpenGLRenderer* renderer, jfloat dx, jfloat dy) {
166    renderer->translate(dx, dy);
167}
168
169static void android_view_GLES20Canvas_rotate(JNIEnv* env, jobject canvas,
170        OpenGLRenderer* renderer, jfloat degrees) {
171    renderer->rotate(degrees);
172}
173
174static void android_view_GLES20Canvas_scale(JNIEnv* env, jobject canvas,
175        OpenGLRenderer* renderer, jfloat sx, jfloat sy) {
176    renderer->scale(sx, sy);
177}
178
179static void android_view_GLES20Canvas_setMatrix(JNIEnv* env, jobject canvas,
180        OpenGLRenderer* renderer, SkMatrix* matrix) {
181    renderer->setMatrix(matrix);
182}
183
184static void android_view_GLES20Canvas_getMatrix(JNIEnv* env, jobject canvas,
185        OpenGLRenderer* renderer, SkMatrix* matrix) {
186    renderer->getMatrix(matrix);
187}
188
189static void android_view_GLES20Canvas_concatMatrix(JNIEnv* env, jobject canvas,
190        OpenGLRenderer* renderer, SkMatrix* matrix) {
191    renderer->concatMatrix(matrix);
192}
193
194// ----------------------------------------------------------------------------
195// Drawing
196// ----------------------------------------------------------------------------
197
198static void android_view_GLES20Canvas_drawBitmap(JNIEnv* env, jobject canvas,
199        OpenGLRenderer* renderer, SkBitmap* bitmap, float left, float top, SkPaint* paint) {
200    renderer->drawBitmap(bitmap, left, top, paint);
201}
202
203static void android_view_GLES20Canvas_drawBitmapRect(JNIEnv* env, jobject canvas,
204        OpenGLRenderer* renderer, SkBitmap* bitmap,
205        float srcLeft, float srcTop, float srcRight, float srcBottom,
206        float dstLeft, float dstTop, float dstRight, float dstBottom, SkPaint* paint) {
207    renderer->drawBitmap(bitmap, srcLeft, srcTop, srcRight, srcBottom,
208            dstLeft, dstTop, dstRight, dstBottom, paint);
209}
210
211static void android_view_GLES20Canvas_drawBitmapMatrix(JNIEnv* env, jobject canvas,
212        OpenGLRenderer* renderer, SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
213    renderer->drawBitmap(bitmap, matrix, paint);
214}
215
216static void android_view_GLES20Canvas_drawPatch(JNIEnv* env, jobject canvas,
217        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray chunks,
218        float left, float top, float right, float bottom, SkPaint* paint) {
219    jbyte* storage = env->GetByteArrayElements(chunks, NULL);
220    Res_png_9patch* patch = reinterpret_cast<Res_png_9patch*>(storage);
221    Res_png_9patch::deserialize(patch);
222
223    renderer->drawPatch(bitmap, patch, left, top, right, bottom, paint);
224
225    env->ReleaseByteArrayElements(chunks, storage, 0);
226}
227
228static void android_view_GLES20Canvas_drawColor(JNIEnv* env, jobject canvas,
229        OpenGLRenderer* renderer, jint color, SkXfermode::Mode mode) {
230    renderer->drawColor(color, mode);
231}
232
233static void android_view_GLES20Canvas_drawRect(JNIEnv* env, jobject canvas,
234        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
235        SkPaint* paint) {
236    renderer->drawRect(left, top, right, bottom, paint);
237}
238
239static void android_view_GLES20Canvas_drawRects(JNIEnv* env, jobject canvas,
240        OpenGLRenderer* renderer, SkRegion* region, SkPaint* paint) {
241    SkRegion::Iterator it(*region);
242    while (!it.done()) {
243        const SkIRect& r = it.rect();
244        renderer->drawRect(r.fLeft, r.fTop, r.fRight, r.fBottom, paint);
245        it.next();
246    }
247}
248
249static void android_view_GLES20Canvas_drawPath(JNIEnv* env, jobject canvas,
250        OpenGLRenderer* renderer, SkPath* path, SkPaint* paint) {
251    renderer->drawPath(path, paint);
252}
253
254// ----------------------------------------------------------------------------
255// Shaders and color filters
256// ----------------------------------------------------------------------------
257
258static void android_view_GLES20Canvas_resetModifiers(JNIEnv* env, jobject canvas,
259        OpenGLRenderer* renderer) {
260    renderer->resetShader();
261    renderer->resetColorFilter();
262}
263
264static void android_view_GLES20Canvas_setupShader(JNIEnv* env, jobject canvas,
265        OpenGLRenderer* renderer, SkiaShader* shader) {
266    renderer->setupShader(shader);
267}
268
269static void android_view_GLES20Canvas_setupColorFilter(JNIEnv* env, jobject canvas,
270        OpenGLRenderer* renderer, SkiaColorFilter* filter) {
271    renderer->setupColorFilter(filter);
272}
273
274// ----------------------------------------------------------------------------
275// Text
276// ----------------------------------------------------------------------------
277
278static void renderText(OpenGLRenderer* renderer, const jchar* text, int count,
279        jfloat x, jfloat y, int flags, SkPaint* paint) {
280    const jchar *workText;
281    jchar* buffer = NULL;
282    int32_t workBytes;
283    if (TextLayout::prepareText(paint, text, count, flags, &workText, &workBytes, &buffer)) {
284        renderer->drawText((const char*) workText, workBytes, count, x, y, paint);
285        free(buffer);
286    }
287}
288
289static void renderTextRun(OpenGLRenderer* renderer, const jchar* text,
290        jint start, jint count, jint contextCount, jfloat x, jfloat y,
291        int flags, SkPaint* paint) {
292    uint8_t rtl = flags & 0x1;
293    if (rtl) {
294        SkAutoSTMalloc<80, jchar> buffer(contextCount);
295        jchar* shaped = buffer.get();
296        if (TextLayout::prepareRtlTextRun(text, start, count, contextCount, shaped)) {
297            renderer->drawText((const char*) shaped, count << 1, count, x, y, paint);
298        } else {
299            LOGW("drawTextRun error");
300        }
301    } else {
302        renderer->drawText((const char*) (text + start), count << 1, count, x, y, paint);
303    }
304}
305
306static void android_view_GLES20Canvas_drawTextArray(JNIEnv* env, jobject canvas,
307        OpenGLRenderer* renderer, jcharArray text, int index, int count,
308        jfloat x, jfloat y, int flags, SkPaint* paint) {
309    jchar* textArray = env->GetCharArrayElements(text, NULL);
310    renderText(renderer, textArray + index, count, x, y, flags, paint);
311    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
312}
313
314static void android_view_GLES20Canvas_drawText(JNIEnv* env, jobject canvas,
315        OpenGLRenderer* renderer, jstring text, int start, int end,
316        jfloat x, jfloat y, int flags, SkPaint* paint) {
317    const jchar* textArray = env->GetStringChars(text, NULL);
318    renderText(renderer, textArray + start, end - start, x, y, flags, paint);
319    env->ReleaseStringChars(text, textArray);
320}
321
322static void android_view_GLES20Canvas_drawTextRunArray(JNIEnv* env, jobject canvas,
323        OpenGLRenderer* renderer, jcharArray text, int index, int count,
324        int contextIndex, int contextCount, jfloat x, jfloat y, int dirFlags,
325        SkPaint* paint) {
326    jchar* textArray = env->GetCharArrayElements(text, NULL);
327    renderTextRun(renderer, textArray + contextIndex, index - contextIndex,
328            count, contextCount, x, y, dirFlags, paint);
329    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
330 }
331
332static void android_view_GLES20Canvas_drawTextRun(JNIEnv* env, jobject canvas,
333        OpenGLRenderer* renderer, jstring text, int start, int end,
334        int contextStart, int contextEnd, jfloat x, jfloat y, int dirFlags,
335        SkPaint* paint) {
336    const jchar* textArray = env->GetStringChars(text, NULL);
337    jint count = end - start;
338    jint contextCount = contextEnd - contextStart;
339    renderTextRun(renderer, textArray + contextStart, start - contextStart,
340            count, contextCount, x, y, dirFlags, paint);
341    env->ReleaseStringChars(text, textArray);
342}
343
344#endif // USE_OPENGL_RENDERER
345
346// ----------------------------------------------------------------------------
347// Common
348// ----------------------------------------------------------------------------
349
350static jboolean android_view_GLES20Canvas_isAvailable(JNIEnv* env, jobject clazz) {
351#ifdef USE_OPENGL_RENDERER
352    return JNI_TRUE;
353#else
354    return JNI_FALSE;
355#endif
356}
357
358// ----------------------------------------------------------------------------
359// JNI Glue
360// ----------------------------------------------------------------------------
361
362const char* const kClassPathName = "android/view/GLES20Canvas";
363
364static JNINativeMethod gMethods[] = {
365    { "nIsAvailable",       "()Z",             (void*) android_view_GLES20Canvas_isAvailable },
366
367#ifdef USE_OPENGL_RENDERER
368    { "nCreateRenderer",    "()I",             (void*) android_view_GLES20Canvas_createRenderer },
369    { "nDestroyRenderer",   "(I)V",            (void*) android_view_GLES20Canvas_destroyRenderer },
370    { "nSetViewport",       "(III)V",          (void*) android_view_GLES20Canvas_setViewport },
371    { "nPrepare",           "(I)V",            (void*) android_view_GLES20Canvas_prepare },
372
373    { "nSave",              "(II)I",           (void*) android_view_GLES20Canvas_save },
374    { "nRestore",           "(I)V",            (void*) android_view_GLES20Canvas_restore },
375    { "nRestoreToCount",    "(II)V",           (void*) android_view_GLES20Canvas_restoreToCount },
376    { "nGetSaveCount",      "(I)I",            (void*) android_view_GLES20Canvas_getSaveCount },
377
378    { "nSaveLayer",         "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayer },
379    { "nSaveLayerAlpha",    "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayerAlpha },
380
381    { "nQuickReject",       "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_quickReject },
382    { "nClipRect",          "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_clipRectF },
383    { "nClipRect",          "(IIIIII)Z",       (void*) android_view_GLES20Canvas_clipRect },
384
385    { "nTranslate",         "(IFF)V",          (void*) android_view_GLES20Canvas_translate },
386    { "nRotate",            "(IF)V",           (void*) android_view_GLES20Canvas_rotate },
387    { "nScale",             "(IFF)V",          (void*) android_view_GLES20Canvas_scale },
388
389    { "nSetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_setMatrix },
390    { "nGetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_getMatrix },
391    { "nConcatMatrix",      "(II)V",           (void*) android_view_GLES20Canvas_concatMatrix },
392
393    { "nDrawBitmap",        "(IIFFI)V",        (void*) android_view_GLES20Canvas_drawBitmap },
394    { "nDrawBitmap",        "(IIFFFFFFFFI)V",  (void*) android_view_GLES20Canvas_drawBitmapRect },
395    { "nDrawBitmap",        "(IIII)V",         (void*) android_view_GLES20Canvas_drawBitmapMatrix },
396    { "nDrawPatch",         "(II[BFFFFI)V",    (void*) android_view_GLES20Canvas_drawPatch },
397    { "nDrawColor",         "(III)V",          (void*) android_view_GLES20Canvas_drawColor },
398    { "nDrawRect",          "(IFFFFI)V",       (void*) android_view_GLES20Canvas_drawRect },
399    { "nDrawRects",         "(III)V",          (void*) android_view_GLES20Canvas_drawRects },
400    { "nDrawPath",          "(III)V",          (void*) android_view_GLES20Canvas_drawPath },
401
402    { "nResetModifiers",    "(I)V",            (void*) android_view_GLES20Canvas_resetModifiers },
403    { "nSetupShader",       "(II)V",           (void*) android_view_GLES20Canvas_setupShader },
404    { "nSetupColorFilter",  "(II)V",           (void*) android_view_GLES20Canvas_setupColorFilter },
405
406    { "nDrawText",          "(I[CIIFFII)V",    (void*) android_view_GLES20Canvas_drawTextArray },
407    { "nDrawText",          "(ILjava/lang/String;IIFFII)V",
408            (void*) android_view_GLES20Canvas_drawText },
409
410    { "nDrawTextRun",       "(I[CIIIIFFII)V",  (void*) android_view_GLES20Canvas_drawTextRunArray },
411    { "nDrawTextRun",       "(ILjava/lang/String;IIIIFFII)V",
412            (void*) android_view_GLES20Canvas_drawTextRun },
413
414    {   "nGetClipBounds",     "(ILandroid/graphics/Rect;)Z",
415            (void*) android_view_GLES20Canvas_getClipBounds },
416#endif
417};
418
419#ifdef USE_OPENGL_RENDERER
420    #define FIND_CLASS(var, className) \
421            var = env->FindClass(className); \
422            LOG_FATAL_IF(! var, "Unable to find class " className); \
423            var = jclass(env->NewGlobalRef(var));
424
425    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
426            var = env->GetMethodID(clazz, methodName, methodDescriptor); \
427            LOG_FATAL_IF(! var, "Unable to find method " methodName);
428#else
429    #define FIND_CLASS(var, className)
430    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor)
431#endif
432
433int register_android_view_GLES20Canvas(JNIEnv* env) {
434    FIND_CLASS(gRectClassInfo.clazz, "android/graphics/Rect");
435    GET_METHOD_ID(gRectClassInfo.set, gRectClassInfo.clazz, "set", "(IIII)V");
436
437    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
438}
439
440};
441