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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 "SkBitmap.h"
      9 #include "SkCanvas.h"
     10 #include "SkColor.h"
     11 #include "SkPaint.h"
     12 #include "SkPoint.h"
     13 #include "SkRect.h"
     14 #include "SkTypes.h"
     15 #include "Test.h"
     16 
     17 static const SkColor bgColor = SK_ColorWHITE;
     18 
     19 static void create(SkBitmap* bm, SkIRect bound) {
     20     bm->allocN32Pixels(bound.width(), bound.height());
     21 }
     22 
     23 static void drawBG(SkCanvas* canvas) {
     24     canvas->drawColor(bgColor);
     25 }
     26 
     27 /** Assumes that the ref draw was completely inside ref canvas --
     28     implies that everything outside is "bgColor".
     29     Checks that all overlap is the same and that all non-overlap on the
     30     ref is "bgColor".
     31  */
     32 static bool compare(const SkBitmap& ref, const SkIRect& iref,
     33                     const SkBitmap& test, const SkIRect& itest)
     34 {
     35     const int xOff = itest.fLeft - iref.fLeft;
     36     const int yOff = itest.fTop - iref.fTop;
     37 
     38     SkAutoLockPixels alpRef(ref);
     39     SkAutoLockPixels alpTest(test);
     40 
     41     for (int y = 0; y < test.height(); ++y) {
     42         for (int x = 0; x < test.width(); ++x) {
     43             SkColor testColor = test.getColor(x, y);
     44             int refX = x + xOff;
     45             int refY = y + yOff;
     46             SkColor refColor;
     47             if (refX >= 0 && refX < ref.width() &&
     48                 refY >= 0 && refY < ref.height())
     49             {
     50                 refColor = ref.getColor(refX, refY);
     51             } else {
     52                 refColor = bgColor;
     53             }
     54             if (refColor != testColor) {
     55                 return false;
     56             }
     57         }
     58     }
     59     return true;
     60 }
     61 
     62 DEF_TEST(DrawText, reporter) {
     63     SkPaint paint;
     64     paint.setColor(SK_ColorGRAY);
     65     paint.setTextSize(SkIntToScalar(20));
     66 
     67     SkIRect drawTextRect = SkIRect::MakeWH(64, 64);
     68     SkBitmap drawTextBitmap;
     69     create(&drawTextBitmap, drawTextRect);
     70     SkCanvas drawTextCanvas(drawTextBitmap);
     71 
     72     SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64);
     73     SkBitmap drawPosTextBitmap;
     74     create(&drawPosTextBitmap, drawPosTextRect);
     75     SkCanvas drawPosTextCanvas(drawPosTextBitmap);
     76 
     77     // Two test cases "A" for the normal path through the code, and " " to check the
     78     // early return path.
     79     const char* cases[] = {"A", " "};
     80     for (auto c : cases) {
     81         for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) {
     82             for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) {
     83                 SkPoint point = SkPoint::Make(25.0f + offsetX,
     84                                               25.0f + offsetY);
     85 
     86                 for (int align = 0; align < SkPaint::kAlignCount; ++align) {
     87                     paint.setTextAlign(static_cast<SkPaint::Align>(align));
     88 
     89                     for (unsigned int flags = 0; flags < (1 << 3); ++flags) {
     90                         static const unsigned int antiAliasFlag = 1;
     91                         static const unsigned int subpixelFlag = 1 << 1;
     92                         static const unsigned int lcdFlag = 1 << 2;
     93 
     94                         paint.setAntiAlias(SkToBool(flags & antiAliasFlag));
     95                         paint.setSubpixelText(SkToBool(flags & subpixelFlag));
     96                         paint.setLCDRenderText(SkToBool(flags & lcdFlag));
     97 
     98                         // Test: drawText and drawPosText draw the same.
     99                         drawBG(&drawTextCanvas);
    100                         drawTextCanvas.drawText(c, 1, point.fX, point.fY, paint);
    101 
    102                         drawBG(&drawPosTextCanvas);
    103                         drawPosTextCanvas.drawPosText(c, 1, &point, paint);
    104 
    105                         REPORTER_ASSERT(reporter,
    106                                         compare(drawTextBitmap, drawTextRect,
    107                                                 drawPosTextBitmap, drawPosTextRect));
    108                     }
    109                 }
    110             }
    111         }
    112     }
    113 }
    114