Subpixel text 3/8 of a pixel too far to the right.
http://codereview.appspot.com/5502097/
git-svn-id: http://skia.googlecode.com/svn/trunk@3037 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/DrawTextTest.cpp b/tests/DrawTextTest.cpp
new file mode 100644
index 0000000..aefe2f9
--- /dev/null
+++ b/tests/DrawTextTest.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkTypes.h"
+
+#include "Test.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkPaint.h"
+#include "SkPoint.h"
+#include "SkRect.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+static const SkColor bgColor = SK_ColorWHITE;
+
+static void create(SkBitmap* bm, SkIRect bound, SkBitmap::Config config) {
+ bm->setConfig(config, bound.width(), bound.height());
+ bm->allocPixels();
+}
+
+static void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(bgColor);
+}
+
+/** Assumes that the ref draw was completely inside ref canvas --
+ implies that everything outside is "bgColor".
+ Checks that all overlap is the same and that all non-overlap on the
+ ref is "bgColor".
+ */
+static bool compare(const SkBitmap& ref, const SkIRect& iref,
+ const SkBitmap& test, const SkIRect& itest)
+{
+ const int xOff = itest.fLeft - iref.fLeft;
+ const int yOff = itest.fTop - iref.fTop;
+
+ SkAutoLockPixels alpRef(ref);
+ SkAutoLockPixels alpTest(test);
+
+ for (int y = 0; y < test.height(); ++y) {
+ for (int x = 0; x < test.width(); ++x) {
+ SkColor testColor = test.getColor(x, y);
+ int refX = x + xOff;
+ int refY = y + yOff;
+ SkColor refColor;
+ if (refX >= 0 && refX < ref.width() &&
+ refY >= 0 && refY < ref.height())
+ {
+ refColor = ref.getColor(refX, refY);
+ } else {
+ refColor = bgColor;
+ }
+ if (refColor != testColor) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+static void test_drawText(skiatest::Reporter* reporter) {
+
+ SkPaint paint;
+ paint.setColor(SK_ColorGRAY);
+ paint.setTextSize(SkIntToScalar(20));
+
+ SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
+ SkBitmap drawTextBitmap;
+ create(&drawTextBitmap, drawTextRect, SkBitmap::kARGB_8888_Config);
+ SkCanvas drawTextCanvas(drawTextBitmap);
+
+ SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
+ SkBitmap drawPosTextBitmap;
+ create(&drawPosTextBitmap, drawPosTextRect, SkBitmap::kARGB_8888_Config);
+ SkCanvas drawPosTextCanvas(drawPosTextBitmap);
+
+ for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
+ for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
+ SkPoint point = SkPoint::Make(SkFloatToScalar(25.0f + offsetX),
+ SkFloatToScalar(25.0f + offsetY));
+
+ for (int align = 0; align < SkPaint::kAlignCount; ++align) {
+ paint.setTextAlign(static_cast<SkPaint::Align>(align));
+
+ for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
+ static const unsigned int antiAliasFlag = 1;
+ static const unsigned int subpixelFlag = 1 << 1;
+ static const unsigned int lcdFlag = 1 << 2;
+
+ paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
+ paint.setSubpixelText(SkToBool(flags & subpixelFlag));
+ paint.setLCDRenderText(SkToBool(flags & lcdFlag));
+
+ // Test: drawText and drawPosText draw the same.
+ drawBG(&drawTextCanvas);
+ drawTextCanvas.drawText("A", 1, point.fX, point.fY, paint);
+
+ drawBG(&drawPosTextCanvas);
+ drawPosTextCanvas.drawPosText("A", 1, &point, paint);
+
+ REPORTER_ASSERT(reporter,
+ compare(drawTextBitmap, drawTextRect,
+ drawPosTextBitmap, drawPosTextRect));
+ }
+ }
+ }
+ }
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("DrawText_DrawPosText", DrawTextTestClass, test_drawText)