krajcevski | 2b310e4 | 2014-06-11 12:26:49 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 "SkData.h" |
| 10 | #include "SkEndian.h" |
| 11 | #include "SkImageInfo.h" |
| 12 | #include "SkTextureCompressor.h" |
| 13 | #include "Test.h" |
| 14 | |
| 15 | static const int kLATCBlockDimension = 4; |
| 16 | static const int kLATCEncodedBlockSize = 8; |
| 17 | |
| 18 | /** |
| 19 | * Make sure that we properly fail when we don't have multiple of four image dimensions. |
| 20 | */ |
| 21 | DEF_TEST(CompressLATCFailDimensions, reporter) { |
| 22 | SkBitmap bitmap; |
| 23 | static const int kWidth = 63; |
| 24 | static const int kHeight = 63; |
| 25 | SkImageInfo info = SkImageInfo::MakeA8(kWidth, kHeight); |
| 26 | REPORTER_ASSERT(reporter, kWidth % kLATCBlockDimension != 0); |
| 27 | REPORTER_ASSERT(reporter, kHeight % kLATCBlockDimension != 0); |
| 28 | |
| 29 | bool setInfoSuccess = bitmap.setInfo(info); |
| 30 | REPORTER_ASSERT(reporter, setInfoSuccess); |
| 31 | |
| 32 | bool allocPixelsSuccess = bitmap.allocPixels(info); |
| 33 | REPORTER_ASSERT(reporter, allocPixelsSuccess); |
| 34 | bitmap.unlockPixels(); |
| 35 | |
| 36 | const SkTextureCompressor::Format kLATCFormat = SkTextureCompressor::kLATC_Format; |
| 37 | SkAutoDataUnref latcData(SkTextureCompressor::CompressBitmapToFormat(bitmap, kLATCFormat)); |
| 38 | REPORTER_ASSERT(reporter, NULL == latcData); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Make sure that we properly fail when we don't have the correct bitmap type. |
| 43 | * LATC compressed textures can only be created from A8 bitmaps. |
| 44 | */ |
| 45 | DEF_TEST(CompressLATCFailColorType, reporter) { |
| 46 | SkBitmap bitmap; |
| 47 | static const int kWidth = 64; |
| 48 | static const int kHeight = 64; |
| 49 | SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight); |
| 50 | REPORTER_ASSERT(reporter, kWidth % kLATCBlockDimension == 0); |
| 51 | REPORTER_ASSERT(reporter, kHeight % kLATCBlockDimension == 0); |
| 52 | |
| 53 | bool setInfoSuccess = bitmap.setInfo(info); |
| 54 | REPORTER_ASSERT(reporter, setInfoSuccess); |
| 55 | |
| 56 | bool allocPixelsSuccess = bitmap.allocPixels(info); |
| 57 | REPORTER_ASSERT(reporter, allocPixelsSuccess); |
| 58 | bitmap.unlockPixels(); |
| 59 | |
| 60 | const SkTextureCompressor::Format kLATCFormat = SkTextureCompressor::kLATC_Format; |
| 61 | SkAutoDataUnref latcData(SkTextureCompressor::CompressBitmapToFormat(bitmap, kLATCFormat)); |
| 62 | REPORTER_ASSERT(reporter, NULL == latcData); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Make sure that if we pass in a solid color bitmap that we get the appropriate results |
| 67 | */ |
| 68 | DEF_TEST(CompressLATC, reporter) { |
| 69 | SkBitmap bitmap; |
| 70 | static const int kWidth = 8; |
| 71 | static const int kHeight = 8; |
| 72 | SkImageInfo info = SkImageInfo::MakeA8(kWidth, kHeight); |
| 73 | |
| 74 | bool setInfoSuccess = bitmap.setInfo(info); |
| 75 | REPORTER_ASSERT(reporter, setInfoSuccess); |
| 76 | |
| 77 | bool allocPixelsSuccess = bitmap.allocPixels(info); |
| 78 | REPORTER_ASSERT(reporter, allocPixelsSuccess); |
| 79 | bitmap.unlockPixels(); |
| 80 | |
| 81 | REPORTER_ASSERT(reporter, kWidth % kLATCBlockDimension == 0); |
| 82 | REPORTER_ASSERT(reporter, kHeight % kLATCBlockDimension == 0); |
| 83 | const int numBlocks = (kWidth / kLATCBlockDimension) * (kHeight / kLATCBlockDimension); |
| 84 | const size_t kSizeToBe = static_cast<size_t>(kLATCEncodedBlockSize * numBlocks); |
| 85 | |
| 86 | for (int lum = 0; lum < 256; ++lum) { |
| 87 | bitmap.lockPixels(); |
| 88 | uint8_t* pixels = reinterpret_cast<uint8_t*>(bitmap.getPixels()); |
| 89 | REPORTER_ASSERT(reporter, NULL != pixels); |
| 90 | |
| 91 | for (int i = 0; i < kWidth*kHeight; ++i) { |
| 92 | pixels[i] = lum; |
| 93 | } |
| 94 | bitmap.unlockPixels(); |
| 95 | |
| 96 | const SkTextureCompressor::Format kLATCFormat = SkTextureCompressor::kLATC_Format; |
| 97 | SkAutoDataUnref latcData( |
| 98 | SkTextureCompressor::CompressBitmapToFormat(bitmap, kLATCFormat)); |
| 99 | REPORTER_ASSERT(reporter, NULL != latcData); |
| 100 | REPORTER_ASSERT(reporter, kSizeToBe == latcData->size()); |
| 101 | |
| 102 | // Make sure that it all matches a given block encoding. If the entire bitmap |
| 103 | // is a single value, then the lower two bytes of the encoded data should be that |
| 104 | // value. The remaining indices can be any value, and since we try to match the pixels |
| 105 | // in the chosen palette in increasing index order, each one should be zero. Hence, |
| 106 | // the correct encoding should be just the two luminance values in the bottom two |
| 107 | // bytes of the block encoding. |
| 108 | const uint64_t kConstColorEncoding = SkEndian_SwapLE64(lum | (lum << 8)); |
| 109 | const uint64_t* blockPtr = reinterpret_cast<const uint64_t*>(latcData->data()); |
| 110 | for (int i = 0; i < numBlocks; ++i) { |
| 111 | REPORTER_ASSERT(reporter, blockPtr[i] == kConstColorEncoding); |
| 112 | } |
| 113 | } |
| 114 | } |