1 files changed, 93 insertions, 0 deletions
diff --git a/libs/hwui/tests/common/TestUtils.cpp b/libs/hwui/tests/common/TestUtils.cpp
new file mode 100644
index 000000000000..6cef85203352
--- /dev/null
+++ b/libs/hwui/tests/common/TestUtils.cpp
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "TestUtils.h"
+
+namespace android {
+namespace uirenderer {
+
+SkColor TestUtils::interpolateColor(float fraction, SkColor start, SkColor end) {
+    int startA = (start >> 24) & 0xff;
+    int startR = (start >> 16) & 0xff;
+    int startG = (start >> 8) & 0xff;
+    int startB = start & 0xff;
+
+    int endA = (end >> 24) & 0xff;
+    int endR = (end >> 16) & 0xff;
+    int endG = (end >> 8) & 0xff;
+    int endB = end & 0xff;
+
+    return (int)((startA + (int)(fraction * (endA - startA))) << 24)
+            | (int)((startR + (int)(fraction * (endR - startR))) << 16)
+            | (int)((startG + (int)(fraction * (endG - startG))) << 8)
+            | (int)((startB + (int)(fraction * (endB - startB))));
+}
+
+void TestUtils::drawTextToCanvas(TestCanvas* canvas, const char* text,
+        const SkPaint& paint, float x, float y) {
+    // drawing text requires GlyphID TextEncoding (which JNI layer would have done)
+    LOG_ALWAYS_FATAL_IF(paint.getTextEncoding() != SkPaint::kGlyphID_TextEncoding,
+            "must use glyph encoding");
+
+    SkMatrix identity;
+    identity.setIdentity();
+    SkSurfaceProps surfaceProps(0, kUnknown_SkPixelGeometry);
+    SkAutoGlyphCacheNoGamma autoCache(paint, &surfaceProps, &identity);
+
+    float totalAdvance = 0;
+    std::vector<glyph_t> glyphs;
+    std::vector<float> positions;
+    Rect bounds;
+    while (*text != '\0') {
+        SkUnichar unichar = SkUTF8_NextUnichar(&text);
+        glyph_t glyph = autoCache.getCache()->unicharToGlyph(unichar);
+        autoCache.getCache()->unicharToGlyph(unichar);
+
+        // push glyph and its relative position
+        glyphs.push_back(glyph);
+        positions.push_back(totalAdvance);
+        positions.push_back(0);
+
+        // compute bounds
+        SkGlyph skGlyph = autoCache.getCache()->getUnicharMetrics(unichar);
+        Rect glyphBounds(skGlyph.fWidth, skGlyph.fHeight);
+        glyphBounds.translate(totalAdvance + skGlyph.fLeft, skGlyph.fTop);
+        bounds.unionWith(glyphBounds);
+
+        // advance next character
+        SkScalar skWidth;
+        paint.getTextWidths(&glyph, sizeof(glyph), &skWidth, NULL);
+        totalAdvance += skWidth;
+    }
+
+    // apply alignment via x parameter (which JNI layer would have done)
+    if (paint.getTextAlign() == SkPaint::kCenter_Align) {
+        x -= totalAdvance / 2;
+    } else if (paint.getTextAlign() == SkPaint::kRight_Align) {
+        x -= totalAdvance;
+    }
+
+    bounds.translate(x, y);
+
+    // Force left alignment, since alignment offset is already baked in
+    SkPaint alignPaintCopy(paint);
+    alignPaintCopy.setTextAlign(SkPaint::kLeft_Align);
+    canvas->drawText(glyphs.data(), positions.data(), glyphs.size(), alignPaintCopy, x, y,
+                bounds.left, bounds.top, bounds.right, bounds.bottom, totalAdvance);
+}
+
+} /* namespace uirenderer */
+} /* namespace android */