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      1 /*
      2  * Copyright 2011 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "Test.h"
      9 #include "TestClassDef.h"
     10 #include "SkBitmap.h"
     11 #include "SkCanvas.h"
     12 #include "SkColor.h"
     13 #include "SkPaint.h"
     14 #include "SkPoint.h"
     15 #include "SkRect.h"
     16 #include "SkTypes.h"
     17 
     18 static const SkColor bgColor = SK_ColorWHITE;
     19 
     20 static void create(SkBitmap* bm, SkIRect bound, SkBitmap::Config config) {
     21     bm->setConfig(config, bound.width(), bound.height());
     22     bm->allocPixels();
     23 }
     24 
     25 static void drawBG(SkCanvas* canvas) {
     26     canvas->drawColor(bgColor);
     27 }
     28 
     29 /** Assumes that the ref draw was completely inside ref canvas --
     30     implies that everything outside is "bgColor".
     31     Checks that all overlap is the same and that all non-overlap on the
     32     ref is "bgColor".
     33  */
     34 static bool compare(const SkBitmap& ref, const SkIRect& iref,
     35                     const SkBitmap& test, const SkIRect& itest)
     36 {
     37     const int xOff = itest.fLeft - iref.fLeft;
     38     const int yOff = itest.fTop - iref.fTop;
     39 
     40     SkAutoLockPixels alpRef(ref);
     41     SkAutoLockPixels alpTest(test);
     42 
     43     for (int y = 0; y < test.height(); ++y) {
     44         for (int x = 0; x < test.width(); ++x) {
     45             SkColor testColor = test.getColor(x, y);
     46             int refX = x + xOff;
     47             int refY = y + yOff;
     48             SkColor refColor;
     49             if (refX >= 0 && refX < ref.width() &&
     50                 refY >= 0 && refY < ref.height())
     51             {
     52                 refColor = ref.getColor(refX, refY);
     53             } else {
     54                 refColor = bgColor;
     55             }
     56             if (refColor != testColor) {
     57                 return false;
     58             }
     59         }
     60     }
     61     return true;
     62 }
     63 
     64 DEF_TEST(DrawText, reporter) {
     65     SkPaint paint;
     66     paint.setColor(SK_ColorGRAY);
     67     paint.setTextSize(SkIntToScalar(20));
     68 
     69     SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
     70     SkBitmap drawTextBitmap;
     71     create(&drawTextBitmap, drawTextRect, SkBitmap::kARGB_8888_Config);
     72     SkCanvas drawTextCanvas(drawTextBitmap);
     73 
     74     SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
     75     SkBitmap drawPosTextBitmap;
     76     create(&drawPosTextBitmap, drawPosTextRect, SkBitmap::kARGB_8888_Config);
     77     SkCanvas drawPosTextCanvas(drawPosTextBitmap);
     78 
     79     for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
     80         for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
     81             SkPoint point = SkPoint::Make(25.0f + offsetX,
     82                                           25.0f + offsetY);
     83 
     84             for (int align = 0; align < SkPaint::kAlignCount; ++align) {
     85                 paint.setTextAlign(static_cast<SkPaint::Align>(align));
     86 
     87                 for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
     88                     static const unsigned int antiAliasFlag = 1;
     89                     static const unsigned int subpixelFlag = 1 << 1;
     90                     static const unsigned int lcdFlag = 1 << 2;
     91 
     92                     paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
     93                     paint.setSubpixelText(SkToBool(flags & subpixelFlag));
     94                     paint.setLCDRenderText(SkToBool(flags & lcdFlag));
     95 
     96                     // Test: drawText and drawPosText draw the same.
     97                     drawBG(&drawTextCanvas);
     98                     drawTextCanvas.drawText("A", 1, point.fX, point.fY, paint);
     99 
    100                     drawBG(&drawPosTextCanvas);
    101                     drawPosTextCanvas.drawPosText("A", 1, &point, paint);
    102 
    103                     REPORTER_ASSERT(reporter,
    104                         compare(drawTextBitmap, drawTextRect,
    105                                 drawPosTextBitmap, drawPosTextRect));
    106                 }
    107             }
    108         }
    109     }
    110 }
    111