android_view_GLES20Canvas.cpp revision 9226298891119acff6b5e8b65fb7074fb99dc0c0 
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 <SkXfermode.h>
31
32#include <OpenGLRenderer.h>
33#include <Rect.h>
34#include <ui/Rect.h>
35
36#include "TextLayout.h"
37
38namespace android {
39
40using namespace uirenderer;
41
42// ----------------------------------------------------------------------------
43// Java APIs
44// ----------------------------------------------------------------------------
45
46static struct {
47    jclass clazz;
48    jmethodID set;
49} gRectClassInfo;
50
51// ----------------------------------------------------------------------------
52// Constructors
53// ----------------------------------------------------------------------------
54
55static OpenGLRenderer* android_view_GLES20Canvas_createRenderer(JNIEnv* env, jobject canvas) {
56    return new OpenGLRenderer;
57}
58
59static void android_view_GLES20Canvas_destroyRenderer(JNIEnv* env, jobject canvas,
60        OpenGLRenderer* renderer) {
61    delete renderer;
62}
63
64// ----------------------------------------------------------------------------
65// Setup
66// ----------------------------------------------------------------------------
67
68static void android_view_GLES20Canvas_setViewport(JNIEnv* env, jobject canvas,
69        OpenGLRenderer* renderer, jint width, jint height) {
70    renderer->setViewport(width, height);
71}
72
73static void android_view_GLES20Canvas_prepare(JNIEnv* env, jobject canvas,
74        OpenGLRenderer* renderer) {
75    renderer->prepare();
76}
77
78// ----------------------------------------------------------------------------
79// State
80// ----------------------------------------------------------------------------
81
82static jint android_view_GLES20Canvas_save(JNIEnv* env, jobject canvas, OpenGLRenderer* renderer,
83        jint flags) {
84    return renderer->save(flags);
85}
86
87static jint android_view_GLES20Canvas_getSaveCount(JNIEnv* env, jobject canvas,
88        OpenGLRenderer* renderer) {
89    return renderer->getSaveCount();
90}
91
92static void android_view_GLES20Canvas_restore(JNIEnv* env, jobject canvas,
93        OpenGLRenderer* renderer) {
94    renderer->restore();
95}
96
97static void android_view_GLES20Canvas_restoreToCount(JNIEnv* env, jobject canvas,
98        OpenGLRenderer* renderer, jint saveCount) {
99    renderer->restoreToCount(saveCount);
100}
101
102// ----------------------------------------------------------------------------
103// Layers
104// ----------------------------------------------------------------------------
105
106static jint android_view_GLES20Canvas_saveLayer(JNIEnv* env, jobject canvas,
107        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
108        SkPaint* paint, jint saveFlags) {
109    return renderer->saveLayer(left, top, right, bottom, paint, saveFlags);
110}
111
112static jint android_view_GLES20Canvas_saveLayerAlpha(JNIEnv* env, jobject canvas,
113        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
114        jint alpha, jint saveFlags) {
115    return renderer->saveLayerAlpha(left, top, right, bottom, alpha, saveFlags);
116}
117
118// ----------------------------------------------------------------------------
119// Clipping
120// ----------------------------------------------------------------------------
121
122static bool android_view_GLES20Canvas_quickReject(JNIEnv* env, jobject canvas,
123        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
124        SkCanvas::EdgeType edge) {
125    return renderer->quickReject(left, top, right, bottom);
126}
127
128static bool android_view_GLES20Canvas_clipRectF(JNIEnv* env, jobject canvas,
129        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
130        SkRegion::Op op) {
131    return renderer->clipRect(left, top, right, bottom, op);
132}
133
134static bool android_view_GLES20Canvas_clipRect(JNIEnv* env, jobject canvas,
135        OpenGLRenderer* renderer, jint left, jint top, jint right, jint bottom,
136        SkRegion::Op op) {
137    return renderer->clipRect(float(left), float(top), float(right), float(bottom), op);
138}
139
140static bool android_view_GLES20Canvas_getClipBounds(JNIEnv* env, jobject canvas,
141        OpenGLRenderer* renderer, jobject rect) {
142    const android::uirenderer::Rect& bounds(renderer->getClipBounds());
143
144    env->CallVoidMethod(rect, gRectClassInfo.set,
145            int(bounds.left), int(bounds.top), int(bounds.right), int(bounds.bottom));
146
147    return !bounds.isEmpty();
148}
149
150// ----------------------------------------------------------------------------
151// Transforms
152// ----------------------------------------------------------------------------
153
154static void android_view_GLES20Canvas_translate(JNIEnv* env, jobject canvas,
155        OpenGLRenderer* renderer, jfloat dx, jfloat dy) {
156    renderer->translate(dx, dy);
157}
158
159static void android_view_GLES20Canvas_rotate(JNIEnv* env, jobject canvas,
160        OpenGLRenderer* renderer, jfloat degrees) {
161    renderer->rotate(degrees);
162}
163
164static void android_view_GLES20Canvas_scale(JNIEnv* env, jobject canvas,
165        OpenGLRenderer* renderer, jfloat sx, jfloat sy) {
166    renderer->scale(sx, sy);
167}
168
169static void android_view_GLES20Canvas_setMatrix(JNIEnv* env, jobject canvas,
170        OpenGLRenderer* renderer, SkMatrix* matrix) {
171    renderer->setMatrix(matrix);
172}
173
174static void android_view_GLES20Canvas_getMatrix(JNIEnv* env, jobject canvas,
175        OpenGLRenderer* renderer, SkMatrix* matrix) {
176    renderer->getMatrix(matrix);
177}
178
179static void android_view_GLES20Canvas_concatMatrix(JNIEnv* env, jobject canvas,
180        OpenGLRenderer* renderer, SkMatrix* matrix) {
181    renderer->concatMatrix(matrix);
182}
183
184// ----------------------------------------------------------------------------
185// Drawing
186// ----------------------------------------------------------------------------
187
188static void android_view_GLES20Canvas_drawBitmap(JNIEnv* env, jobject canvas,
189        OpenGLRenderer* renderer, SkBitmap* bitmap, float left, float top, SkPaint* paint) {
190    renderer->drawBitmap(bitmap, left, top, paint);
191}
192
193static void android_view_GLES20Canvas_drawBitmapRect(JNIEnv* env, jobject canvas,
194        OpenGLRenderer* renderer, SkBitmap* bitmap,
195        float srcLeft, float srcTop, float srcRight, float srcBottom,
196        float dstLeft, float dstTop, float dstRight, float dstBottom, SkPaint* paint) {
197    renderer->drawBitmap(bitmap, srcLeft, srcTop, srcRight, srcBottom,
198            dstLeft, dstTop, dstRight, dstBottom, paint);
199}
200
201static void android_view_GLES20Canvas_drawBitmapMatrix(JNIEnv* env, jobject canvas,
202        OpenGLRenderer* renderer, SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
203    renderer->drawBitmap(bitmap, matrix, paint);
204}
205
206static void android_view_GLES20Canvas_drawPatch(JNIEnv* env, jobject canvas,
207        OpenGLRenderer* renderer, SkBitmap* bitmap, jbyteArray chunks,
208        float left, float top, float right, float bottom, SkPaint* paint) {
209    jbyte* storage = env->GetByteArrayElements(chunks, NULL);
210    Res_png_9patch* patch = reinterpret_cast<Res_png_9patch*>(storage);
211    Res_png_9patch::deserialize(patch);
212
213    renderer->drawPatch(bitmap, patch, left, top, right, bottom, paint);
214
215    env->ReleaseByteArrayElements(chunks, storage, 0);
216}
217
218static void android_view_GLES20Canvas_drawColor(JNIEnv* env, jobject canvas,
219        OpenGLRenderer* renderer, jint color, SkXfermode::Mode mode) {
220    renderer->drawColor(color, mode);
221}
222
223static void android_view_GLES20Canvas_drawRect(JNIEnv* env, jobject canvas,
224        OpenGLRenderer* renderer, jfloat left, jfloat top, jfloat right, jfloat bottom,
225        SkPaint* paint) {
226    renderer->drawRect(left, top, right, bottom, paint);
227}
228
229// ----------------------------------------------------------------------------
230// Shaders
231// ----------------------------------------------------------------------------
232
233static void android_view_GLES20Canvas_resetShader(JNIEnv* env, jobject canvas,
234        OpenGLRenderer* renderer) {
235    renderer->resetShader();
236}
237
238static void android_view_GLES20Canvas_setupBitmapShader(JNIEnv* env, jobject canvas,
239        OpenGLRenderer* renderer, SkShader* shader, SkBitmap* bitmap,
240        SkShader::TileMode tileX, SkShader::TileMode tileY, SkMatrix* matrix) {
241    renderer->setupBitmapShader(bitmap, tileX, tileY, matrix,
242            (shader->getFlags() & SkShader::kOpaqueAlpha_Flag) == 0);
243}
244
245static void android_view_GLES20Canvas_setupLinearShader(JNIEnv* env, jobject canvas,
246        OpenGLRenderer* renderer, SkShader* shader, float* bounds, uint32_t* colors,
247        float* positions, int count, SkShader::TileMode tileMode, SkMatrix* matrix) {
248    renderer->setupLinearGradientShader(shader, bounds, colors, positions, count,
249            tileMode, matrix, (shader->getFlags() & SkShader::kOpaqueAlpha_Flag) == 0);
250}
251
252// ----------------------------------------------------------------------------
253// Text
254// ----------------------------------------------------------------------------
255
256static void renderText(OpenGLRenderer* renderer, const jchar* text, int count,
257        jfloat x, jfloat y, int flags, SkPaint* paint) {
258    const jchar *workText;
259    jchar* buffer = NULL;
260    int32_t workBytes;
261    if (TextLayout::prepareText(paint, text, count, flags, &workText, &workBytes, &buffer)) {
262        renderer->drawText((const char*) workText, workBytes, count, x, y, paint);
263        free(buffer);
264    }
265}
266
267static void android_view_GLES20Canvas_drawTextArray(JNIEnv* env, jobject canvas,
268        OpenGLRenderer* renderer, jcharArray text, int index, int count,
269        jfloat x, jfloat y, int flags, SkPaint* paint) {
270    jchar* textArray = env->GetCharArrayElements(text, NULL);
271    renderText(renderer, textArray + index, count, x, y, flags, paint);
272    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
273}
274
275static void android_view_GLES20Canvas_drawText(JNIEnv* env, jobject canvas,
276        OpenGLRenderer* renderer, jstring text, int start, int end,
277        jfloat x, jfloat y, int flags, SkPaint* paint) {
278    const jchar* textArray = env->GetStringChars(text, NULL);
279    renderText(renderer, textArray + start, end - start, x, y, flags, paint);
280    env->ReleaseStringChars(text, textArray);
281}
282
283// ----------------------------------------------------------------------------
284// JNI Glue
285// ----------------------------------------------------------------------------
286
287const char* const kClassPathName = "android/view/GLES20Canvas";
288
289static JNINativeMethod gMethods[] = {
290    {   "nCreateRenderer",    "()I",             (void*) android_view_GLES20Canvas_createRenderer },
291    {   "nDestroyRenderer",   "(I)V",            (void*) android_view_GLES20Canvas_destroyRenderer },
292    {   "nSetViewport",       "(III)V",          (void*) android_view_GLES20Canvas_setViewport },
293    {   "nPrepare",           "(I)V",            (void*) android_view_GLES20Canvas_prepare },
294
295    {   "nSave",              "(II)I",           (void*) android_view_GLES20Canvas_save },
296    {   "nRestore",           "(I)V",            (void*) android_view_GLES20Canvas_restore },
297    {   "nRestoreToCount",    "(II)V",           (void*) android_view_GLES20Canvas_restoreToCount },
298    {   "nGetSaveCount",      "(I)I",            (void*) android_view_GLES20Canvas_getSaveCount },
299
300    {   "nSaveLayer",         "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayer },
301    {   "nSaveLayerAlpha",    "(IFFFFII)I",      (void*) android_view_GLES20Canvas_saveLayerAlpha },
302
303    {   "nQuickReject",       "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_quickReject },
304    {   "nClipRect",          "(IFFFFI)Z",       (void*) android_view_GLES20Canvas_clipRectF },
305    {   "nClipRect",          "(IIIIII)Z",       (void*) android_view_GLES20Canvas_clipRect },
306
307    {   "nTranslate",         "(IFF)V",          (void*) android_view_GLES20Canvas_translate },
308    {   "nRotate",            "(IF)V",           (void*) android_view_GLES20Canvas_rotate },
309    {   "nScale",             "(IFF)V",          (void*) android_view_GLES20Canvas_scale },
310
311    {   "nSetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_setMatrix },
312    {   "nGetMatrix",         "(II)V",           (void*) android_view_GLES20Canvas_getMatrix },
313    {   "nConcatMatrix",      "(II)V",           (void*) android_view_GLES20Canvas_concatMatrix },
314
315    {   "nDrawBitmap",        "(IIFFI)V",        (void*) android_view_GLES20Canvas_drawBitmap },
316    {   "nDrawBitmap",        "(IIFFFFFFFFI)V",  (void*) android_view_GLES20Canvas_drawBitmapRect },
317    {   "nDrawBitmap",        "(IIII)V",         (void*) android_view_GLES20Canvas_drawBitmapMatrix },
318    {   "nDrawPatch",         "(II[BFFFFI)V",    (void*) android_view_GLES20Canvas_drawPatch },
319    {   "nDrawColor",         "(III)V",          (void*) android_view_GLES20Canvas_drawColor },
320    {   "nDrawRect",          "(IFFFFI)V",       (void*) android_view_GLES20Canvas_drawRect },
321
322    {   "nResetShader",       "(I)V",            (void*) android_view_GLES20Canvas_resetShader },
323    {   "nSetupBitmapShader", "(IIIIII)V",       (void*) android_view_GLES20Canvas_setupBitmapShader },
324    {   "nSetupLinearShader", "(IIIIIIII)V",     (void*) android_view_GLES20Canvas_setupLinearShader },
325
326    {   "nDrawText",          "(I[CIIFFII)V",    (void*) android_view_GLES20Canvas_drawTextArray },
327    {   "nDrawText",          "(ILjava/lang/String;IIFFII)V",
328            (void*) android_view_GLES20Canvas_drawText },
329
330    {   "nGetClipBounds",     "(ILandroid/graphics/Rect;)Z",
331            (void*) android_view_GLES20Canvas_getClipBounds },
332};
333
334#define FIND_CLASS(var, className) \
335        var = env->FindClass(className); \
336        LOG_FATAL_IF(! var, "Unable to find class " className); \
337        var = jclass(env->NewGlobalRef(var));
338
339#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
340        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
341        LOG_FATAL_IF(! var, "Unable to find method " methodName);
342
343int register_android_view_GLES20Canvas(JNIEnv* env) {
344    FIND_CLASS(gRectClassInfo.clazz, "android/graphics/Rect");
345    GET_METHOD_ID(gRectClassInfo.set, gRectClassInfo.clazz, "set", "(IIII)V");
346
347    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
348}
349
350};
351