First pass at implementing Canvas.drawPosText() in GL

Romain Guy · Romain Guy · commit eb9a5367e8f0 · 2012-01-17T17:39:26.000-08:00
Change-Id: Ia3ac347e95d57eb86c63045156c8dbc0572b03cb
diff --git a/core/java/android/view/GLES20Canvas.java b/core/java/android/view/GLES20Canvas.java
@@ -945,14 +945,38 @@ private static native void nDrawPoints(int renderer, float[] points,
 
     @Override
     public void drawPosText(char[] text, int index, int count, float[] pos, Paint paint) {
-        // TODO: Implement
+        if (index < 0 || index + count > text.length || count * 2 > pos.length) {
+            throw new IndexOutOfBoundsException();
+        }
+
+        int modifiers = setupModifiers(paint);
+        try {
+            nDrawPosText(mRenderer, text, index, count, pos, paint.mNativePaint);
+        } finally {
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
+        }
     }
 
+    private static native void nDrawPosText(int renderer, char[] text, int index, int count,
+            float[] pos, int paint);
+
     @Override
     public void drawPosText(String text, float[] pos, Paint paint) {
-        // TODO: Implement
+        if (text.length() * 2 > pos.length) {
+            throw new ArrayIndexOutOfBoundsException();
+        }
+
+        int modifiers = setupModifiers(paint);
+        try {
+            nDrawPosText(mRenderer, text, 0, text.length(), pos, paint.mNativePaint);
+        } finally {
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
+        }
     }
 
+    private static native void nDrawPosText(int renderer, String text, int start, int end,
+            float[] pos, int paint);
+
     @Override
     public void drawRect(float left, float top, float right, float bottom, Paint paint) {
         int modifiers = setupModifiers(paint);
diff --git a/core/jni/android_view_GLES20Canvas.cpp b/core/jni/android_view_GLES20Canvas.cpp
@@ -567,6 +567,54 @@ static void android_view_GLES20Canvas_drawTextRun(JNIEnv* env, jobject clazz,
     env->ReleaseStringChars(text, textArray);
 }
 
+static void renderPosText(OpenGLRenderer* renderer, const jchar* text, int count,
+        const jfloat* positions, jint dirFlags, SkPaint* paint) {
+    sp<TextLayoutCacheValue> value;
+#if USE_TEXT_LAYOUT_CACHE
+    value = TextLayoutCache::getInstance().getValue(paint, text, 0, count, count, dirFlags);
+    if (value == NULL) {
+        ALOGE("Cannot get TextLayoutCache value for text = '%s'",
+                String8(text, count).string());
+        return;
+    }
+#else
+    value = new TextLayoutCacheValue(count);
+    TextLayoutEngine::getInstance().computeValues(value.get(), paint,
+            text, 0, count, count, dirFlags);
+#endif
+
+    const jchar* glyphs = value->getGlyphs();
+    size_t glyphsCount = value->getGlyphsCount();
+    int bytesCount = glyphsCount * sizeof(jchar);
+
+    renderer->drawPosText((const char*) glyphs, bytesCount,
+            count < int(glyphsCount) ? count : glyphsCount, positions, paint);
+}
+
+static void android_view_GLES20Canvas_drawPosTextArray(JNIEnv* env, jobject clazz,
+        OpenGLRenderer* renderer, jcharArray text, jint index, jint count,
+        jfloatArray pos, SkPaint* paint) {
+    jchar* textArray = env->GetCharArrayElements(text, NULL);
+    jfloat* positions = env->GetFloatArrayElements(pos, NULL);
+
+    renderPosText(renderer, textArray + index, count, positions, kBidi_LTR, paint);
+
+    env->ReleaseFloatArrayElements(pos, positions, JNI_ABORT);
+    env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
+}
+
+static void android_view_GLES20Canvas_drawPosText(JNIEnv* env, jobject clazz,
+        OpenGLRenderer* renderer, jstring text, jint start, jint end,
+        jfloatArray pos, SkPaint* paint) {
+    const jchar* textArray = env->GetStringChars(text, NULL);
+    jfloat* positions = env->GetFloatArrayElements(pos, NULL);
+
+    renderPosText(renderer, textArray + start, end - start, positions, kBidi_LTR, paint);
+
+    env->ReleaseFloatArrayElements(pos, positions, JNI_ABORT);
+    env->ReleaseStringChars(text, textArray);
+}
+
 // ----------------------------------------------------------------------------
 // Display lists
 // ----------------------------------------------------------------------------
@@ -830,6 +878,10 @@ static JNINativeMethod gMethods[] = {
     { "nDrawTextRun",       "(ILjava/lang/String;IIIIFFII)V",
             (void*) android_view_GLES20Canvas_drawTextRun },
 
+    { "nDrawPosText",       "(I[CII[FI)V",     (void*) android_view_GLES20Canvas_drawPosTextArray },
+    { "nDrawPosText",       "(ILjava/lang/String;II[FI)V",
+            (void*) android_view_GLES20Canvas_drawPosText },
+
     { "nGetClipBounds",     "(ILandroid/graphics/Rect;)Z",
             (void*) android_view_GLES20Canvas_getClipBounds },
 
diff --git a/libs/hwui/DisplayListRenderer.cpp b/libs/hwui/DisplayListRenderer.cpp
@@ -60,6 +60,7 @@ const char* DisplayList::OP_NAMES[] = {
     "DrawLines",
     "DrawPoints",
     "DrawText",
+    "DrawPosText",
     "ResetShader",
     "SetupShader",
     "ResetColorFilter",
@@ -482,6 +483,15 @@ void DisplayList::output(OpenGLRenderer& renderer, uint32_t level) {
                     text.text(), text.length(), count, x, y, paint, length);
             }
             break;
+            case DrawPosText: {
+                getText(&text);
+                int count = getInt();
+                int positionsCount = 0;
+                float* positions = getFloats(positionsCount);
+                SkPaint* paint = getPaint();
+                ALOGD("%s%s %s, %d, %d, %p", (char*) indent, OP_NAMES[op],
+                    text.text(), text.length(), count, paint);
+            }
             case ResetShader: {
                 ALOGD("%s%s", (char*) indent, OP_NAMES[op]);
             }
@@ -844,6 +854,17 @@ bool DisplayList::replay(OpenGLRenderer& renderer, Rect& dirty, uint32_t level)
                 renderer.drawText(text.text(), text.length(), count, x, y, paint, length);
             }
             break;
+            case DrawPosText: {
+                getText(&text);
+                int count = getInt();
+                int positionsCount = 0;
+                float* positions = getFloats(positionsCount);
+                SkPaint* paint = getPaint();
+                DISPLAY_LIST_LOGD("%s%s %s, %d, %d, %p", (char*) indent,
+                        OP_NAMES[op], text.text(), text.length(), count, paint);
+                renderer.drawPosText(text.text(), text.length(), count, positions, paint);
+            }
+            break;
             case ResetShader: {
                 DISPLAY_LIST_LOGD("%s%s", (char*) indent, OP_NAMES[op]);
                 renderer.resetShader();
@@ -1216,6 +1237,17 @@ void DisplayListRenderer::drawText(const char* text, int bytesCount, int count,
     addFloat(length < 0.0f ? paint->measureText(text, bytesCount) : length);
 }
 
+void DisplayListRenderer::drawPosText(const char* text, int bytesCount, int count,
+        const float* positions, SkPaint* paint) {
+    if (count <= 0) return;
+    addOp(DisplayList::DrawPosText);
+    addText(text, bytesCount);
+    addInt(count);
+    addFloats(positions, count * 2);
+    paint->setAntiAlias(true);
+    addPaint(paint);
+}
+
 void DisplayListRenderer::resetShader() {
     addOp(DisplayList::ResetShader);
 }
diff --git a/libs/hwui/DisplayListRenderer.h b/libs/hwui/DisplayListRenderer.h
@@ -96,6 +96,7 @@ class DisplayList {
         DrawLines,
         DrawPoints,
         DrawText,
+        DrawPosText,
         ResetShader,
         SetupShader,
         ResetColorFilter,
@@ -291,6 +292,8 @@ class DisplayListRenderer: public OpenGLRenderer {
     virtual void drawPoints(float* points, int count, SkPaint* paint);
     virtual void drawText(const char* text, int bytesCount, int count, float x, float y,
             SkPaint* paint, float length = 1.0f);
+    virtual void drawPosText(const char* text, int bytesCount, int count, const float* positions,
+            SkPaint* paint);
 
     virtual void resetShader();
     virtual void setupShader(SkiaShader* shader);
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
@@ -2082,6 +2082,17 @@ void OpenGLRenderer::drawRect(float left, float top, float right, float bottom,
     }
 }
 
+void OpenGLRenderer::drawPosText(const char* text, int bytesCount, int count,
+        const float* positions, SkPaint* paint) {
+    if (text == NULL || count == 0) {
+        return;
+    }
+    if (mSnapshot->isIgnored()) return;
+
+    // TODO: implement properly
+    drawText(text, bytesCount, count, 0, 0, paint);
+}
+
 void OpenGLRenderer::drawText(const char* text, int bytesCount, int count,
         float x, float y, SkPaint* paint, float length) {
     if (text == NULL || count == 0) {
@@ -2120,10 +2131,11 @@ void OpenGLRenderer::drawText(const char* text, int bytesCount, int count,
         y = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
     }
 
-    FontRenderer& fontRenderer = mCaches.fontRenderer.getFontRenderer(paint);
 #if DEBUG_GLYPHS
     ALOGD("OpenGLRenderer drawText() with FontID=%d", SkTypeface::UniqueID(paint->getTypeface()));
 #endif
+
+    FontRenderer& fontRenderer = mCaches.fontRenderer.getFontRenderer(paint);
     fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
             paint->getTextSize());
 
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
@@ -124,6 +124,8 @@ class OpenGLRenderer {
     virtual void drawPoints(float* points, int count, SkPaint* paint);
     virtual void drawText(const char* text, int bytesCount, int count, float x, float y,
             SkPaint* paint, float length = -1.0f);
+    virtual void drawPosText(const char* text, int bytesCount, int count, const float* positions,
+            SkPaint* paint);
 
     virtual void resetShader();
     virtual void setupShader(SkiaShader* shader);
