text: /*
   * Copyright 2013 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #include "SkBitmap.h"
  #include "SkMallocPixelRef.h"
  #include "SkRandom.h"
  #include "Test.h"
  
  static void test_peekpixels(skiatest::Reporter* reporter) {
      const SkImageInfo info = SkImageInfo::MakeN32Premul(10, 10);
  
      SkPixmap pmap;
      SkBitmap bm;
  
      // empty should return false
      REPORTER_ASSERT(reporter, !bm.peekPixels(nullptr));
      REPORTER_ASSERT(reporter, !bm.peekPixels(&pmap));
  
      // no pixels should return false
      bm.setInfo(SkImageInfo::MakeN32Premul(10, 10));
      REPORTER_ASSERT(reporter, !bm.peekPixels(nullptr));
      REPORTER_ASSERT(reporter, !bm.peekPixels(&pmap));
  
      // real pixels should return true
      bm.allocPixels(info);
      REPORTER_ASSERT(reporter, bm.peekPixels(nullptr));
      REPORTER_ASSERT(reporter, bm.peekPixels(&pmap));
      REPORTER_ASSERT(reporter, pmap.info() == bm.info());
      REPORTER_ASSERT(reporter, pmap.addr() == bm.getPixels());
      REPORTER_ASSERT(reporter, pmap.rowBytes() == bm.rowBytes());
      REPORTER_ASSERT(reporter, pmap.ctable() == bm.getColorTable());
  }
  
  // https://code.google.com/p/chromium/issues/detail?id=446164
  static void test_bigalloc(skiatest::Reporter* reporter) {
      const int width = 0x40000001;
      const int height = 0x00000096;
      const SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
  
      SkBitmap bm;
      REPORTER_ASSERT(reporter, !bm.tryAllocPixels(info));
  
      SkPixelRef* pr = SkMallocPixelRef::NewAllocate(info, info.minRowBytes(), nullptr);
      REPORTER_ASSERT(reporter, !pr);
  }
  
  static void test_allocpixels(skiatest::Reporter* reporter) {
      const int width = 10;
      const int height = 10;
      const SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
      const size_t explicitRowBytes = info.minRowBytes() + 24;
  
      SkBitmap bm;
      bm.setInfo(info);
      REPORTER_ASSERT(reporter, info.minRowBytes() == bm.rowBytes());
      bm.allocPixels();
      REPORTER_ASSERT(reporter, info.minRowBytes() == bm.rowBytes());
      bm.reset();
      bm.allocPixels(info);
      REPORTER_ASSERT(reporter, info.minRowBytes() == bm.rowBytes());
  
      bm.setInfo(info, explicitRowBytes);
      REPORTER_ASSERT(reporter, explicitRowBytes == bm.rowBytes());
      bm.allocPixels();
      REPORTER_ASSERT(reporter, explicitRowBytes == bm.rowBytes());
      bm.reset();
      bm.allocPixels(info, explicitRowBytes);
      REPORTER_ASSERT(reporter, explicitRowBytes == bm.rowBytes());
  
      bm.reset();
      bm.setInfo(info, 0);
      REPORTER_ASSERT(reporter, info.minRowBytes() == bm.rowBytes());
      bm.reset();
      bm.allocPixels(info, 0);
      REPORTER_ASSERT(reporter, info.minRowBytes() == bm.rowBytes());
  
      bm.reset();
      bool success = bm.setInfo(info, info.minRowBytes() - 1);   // invalid for 32bit
      REPORTER_ASSERT(reporter, !success);
      REPORTER_ASSERT(reporter, bm.isNull());
  }
  
  static void test_bigwidth(skiatest::Reporter* reporter) {
      SkBitmap bm;
      int width = 1 << 29;    // *4 will be the high-bit of 32bit int
  
      SkImageInfo info = SkImageInfo::MakeA8(width, 1);
      REPORTER_ASSERT(reporter, bm.setInfo(info));
      REPORTER_ASSERT(reporter, bm.setInfo(info.makeColorType(kRGB_565_SkColorType)));
  
      // for a 4-byte config, this width will compute a rowbytes of 0x80000000,
      // which does not fit in a int32_t. setConfig should detect this, and fail.
  
      // TODO: perhaps skia can relax this, and only require that rowBytes fit
      //       in a uint32_t (or larger), but for now this is the constraint.
  
      REPORTER_ASSERT(reporter, !bm.setInfo(info.makeColorType(kN32_SkColorType)));
  }
  
  /**
   *  This test contains basic sanity checks concerning bitmaps.
   */
  DEF_TEST(Bitmap, reporter) {
      // Zero-sized bitmaps are allowed
      for (int width = 0; width < 2; ++width) {
          for (int height = 0; height < 2; ++height) {
              SkBitmap bm;
              bool setConf = bm.setInfo(SkImageInfo::MakeN32Premul(width, height));
              REPORTER_ASSERT(reporter, setConf);
              if (setConf) {
                  bm.allocPixels();
              }
              REPORTER_ASSERT(reporter, SkToBool(width & height) != bm.empty());
          }
      }
  
      test_bigwidth(reporter);
      test_allocpixels(reporter);
      test_bigalloc(reporter);
      test_peekpixels(reporter);
  }
  
  /**
   *  This test checks that getColor works for both swizzles.
   */
  DEF_TEST(Bitmap_getColor_Swizzle, r) {
      SkBitmap source;
      source.allocN32Pixels(1,1);
      source.eraseColor(SK_ColorRED);
      SkColorType colorTypes[] = {
          kRGBA_8888_SkColorType,
          kBGRA_8888_SkColorType,
      };
      for (SkColorType ct : colorTypes) {
          SkBitmap copy;
          if (!source.copyTo(&copy, ct)) {
              ERRORF(r, "SkBitmap::copy failed %d", (int)ct);
              continue;
          }
          SkAutoLockPixels autoLockPixels1(copy);
          SkAutoLockPixels autoLockPixels2(source);
          REPORTER_ASSERT(r, source.getColor(0, 0) == copy.getColor(0, 0));
      }
  }
  
  static void test_erasecolor_premul(skiatest::Reporter* reporter, SkColorType ct, SkColor input,
                                     SkColor expected) {
    SkBitmap bm;
    bm.allocPixels(SkImageInfo::Make(1, 1, ct, kPremul_SkAlphaType));
    bm.eraseColor(input);
    INFOF(reporter, "expected: %x actual: %x\n", expected, bm.getColor(0, 0));
    REPORTER_ASSERT(reporter, bm.getColor(0, 0) == expected);
  }
  
  /**
   *  This test checks that eraseColor premultiplies the color correctly.
   */
  DEF_TEST(Bitmap_eraseColor_Premul, r) {
      SkColor color = 0x80FF0080;
      test_erasecolor_premul(r, kAlpha_8_SkColorType, color, 0x80000000);
      test_erasecolor_premul(r, kRGB_565_SkColorType, color, 0xFF840042);
      test_erasecolor_premul(r, kARGB_4444_SkColorType, color, 0x88FF0080);
      test_erasecolor_premul(r, kRGBA_8888_SkColorType, color, color);
      test_erasecolor_premul(r, kBGRA_8888_SkColorType, color, color);
  }
  
  // Test that SkBitmap::ComputeOpaque() is correct for various colortypes.
  DEF_TEST(Bitmap_compute_is_opaque, r) {
      struct {
          SkColorType fCT;
          SkAlphaType fAT;
      } types[] = {
          { kGray_8_SkColorType,    kOpaque_SkAlphaType },
          { kAlpha_8_SkColorType,   kPremul_SkAlphaType },
          { kARGB_4444_SkColorType, kPremul_SkAlphaType },
          { kRGB_565_SkColorType,   kOpaque_SkAlphaType },
          { kBGRA_8888_SkColorType, kPremul_SkAlphaType },
          { kRGBA_8888_SkColorType, kPremul_SkAlphaType },
          { kRGBA_F16_SkColorType,  kPremul_SkAlphaType },
      };
      for (auto type : types) {
          SkBitmap bm;
          REPORTER_ASSERT(r, !SkBitmap::ComputeIsOpaque(bm));
  
          bm.allocPixels(SkImageInfo::Make(13, 17, type.fCT, type.fAT));
          bm.eraseColor(SkColorSetARGB(255, 10, 20, 30));
          REPORTER_ASSERT(r, SkBitmap::ComputeIsOpaque(bm));
  
          bm.eraseColor(SkColorSetARGB(128, 255, 255, 255));
          bool isOpaque = SkBitmap::ComputeIsOpaque(bm);
          bool shouldBeOpaque = (type.fAT == kOpaque_SkAlphaType);
          REPORTER_ASSERT(r, isOpaque == shouldBeOpaque);
      }
  }
  
  // Test that erase+getColor round trips with RGBA_F16 pixels.
  DEF_TEST(Bitmap_erase_f16_erase_getColor, r) {
      SkRandom random;
      SkPixmap pm;
      SkBitmap bm;
      bm.allocPixels(SkImageInfo::Make(1, 1, kRGBA_F16_SkColorType, kPremul_SkAlphaType));
      REPORTER_ASSERT(r, bm.peekPixels(&pm));
      for (unsigned i = 0; i < 0x100; ++i) {
          // Test all possible values of blue component.
          SkColor color1 = (SkColor)((random.nextU() & 0xFFFFFF00) | i);
          // Test all possible values of alpha component.
          SkColor color2 = (SkColor)((random.nextU() & 0x00FFFFFF) | (i << 24));
          for (SkColor color : {color1, color2}) {
              pm.erase(color);
              if (SkColorGetA(color) != 0) {
                  REPORTER_ASSERT(r, color == pm.getColor(0, 0));
              } else {
                  REPORTER_ASSERT(r, 0 == SkColorGetA(pm.getColor(0, 0)));
              }
          }
      }
  }
  
  