reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | #include "SkKernel33MaskFilter.h" |
| 2 | #include "SkColorPriv.h" |
| 3 | |
| 4 | SkMask::Format SkKernel33ProcMaskFilter::getFormat() |
| 5 | { |
| 6 | return SkMask::kA8_Format; |
| 7 | } |
| 8 | |
| 9 | bool SkKernel33ProcMaskFilter::filterMask(SkMask* dst, const SkMask& src, const SkMatrix&, SkIPoint* margin) |
| 10 | { |
| 11 | // margin??? |
| 12 | dst->fImage = NULL; |
| 13 | dst->fBounds = src.fBounds; |
| 14 | dst->fBounds.inset(-1, -1); |
| 15 | dst->fFormat = SkMask::kA8_Format; |
| 16 | |
| 17 | if (NULL == src.fImage) |
| 18 | return true; |
| 19 | |
| 20 | dst->fRowBytes = dst->fBounds.width(); |
| 21 | size_t size = dst->computeImageSize(); |
| 22 | dst->fImage = SkMask::AllocImage(size); |
| 23 | |
| 24 | const int h = src.fBounds.height(); |
| 25 | const int w = src.fBounds.width(); |
| 26 | const int srcRB = src.fRowBytes; |
| 27 | const uint8_t* srcImage = src.fImage; |
| 28 | uint8_t* dstImage = dst->fImage; |
| 29 | |
| 30 | uint8_t* srcRows[3]; |
| 31 | uint8_t storage[3][3]; |
| 32 | |
| 33 | srcRows[0] = storage[0]; |
| 34 | srcRows[1] = storage[1]; |
| 35 | srcRows[2] = storage[2]; |
| 36 | |
| 37 | unsigned scale = fPercent256; |
| 38 | |
| 39 | for (int y = -1; y <= h; y++) |
| 40 | { |
| 41 | uint8_t* dstRow = dstImage; |
| 42 | for (int x = -1; x <= w; x++) |
| 43 | { |
| 44 | memset(storage, 0, sizeof(storage)); |
| 45 | uint8_t* storagePtr = &storage[0][0]; |
| 46 | |
| 47 | for (int ky = y - 1; ky <= y + 1; ky++) |
| 48 | { |
| 49 | const uint8_t* srcRow = srcImage + ky * srcRB; // may be out-of-range |
| 50 | for (int kx = x - 1; kx <= x + 1; kx++) |
| 51 | { |
| 52 | if ((unsigned)ky < (unsigned)h && (unsigned)kx < (unsigned)w) |
| 53 | *storagePtr = srcRow[kx]; |
| 54 | storagePtr++; |
| 55 | } |
| 56 | } |
| 57 | int value = this->computeValue(srcRows); |
| 58 | |
| 59 | if (scale < 256) |
| 60 | value = SkAlphaBlend(value, srcRows[1][1], scale); |
| 61 | *dstRow++ = SkToU8(value); |
| 62 | } |
| 63 | dstImage += dst->fRowBytes; |
| 64 | } |
| 65 | return true; |
| 66 | } |
| 67 | |
| 68 | void SkKernel33ProcMaskFilter::flatten(SkFlattenableWriteBuffer& wb) |
| 69 | { |
| 70 | this->INHERITED::flatten(wb); |
| 71 | wb.write32(fPercent256); |
| 72 | } |
| 73 | |
| 74 | SkKernel33ProcMaskFilter::SkKernel33ProcMaskFilter(SkFlattenableReadBuffer& rb) |
| 75 | : SkMaskFilter(rb) |
| 76 | { |
| 77 | fPercent256 = rb.readS32(); |
| 78 | } |
| 79 | |
| 80 | /////////////////////////////////////////////////////////////////////////////// |
| 81 | |
| 82 | uint8_t SkKernel33MaskFilter::computeValue(uint8_t* const* srcRows) |
| 83 | { |
| 84 | int value = 0; |
| 85 | |
| 86 | for (int i = 0; i < 3; i++) |
| 87 | for (int j = 0; j < 3; j++) |
| 88 | value += fKernel[i][j] * srcRows[i][j]; |
| 89 | |
| 90 | value >>= fShift; |
| 91 | |
| 92 | if (value < 0) |
| 93 | value = 0; |
| 94 | else if (value > 255) |
| 95 | value = 255; |
| 96 | return (uint8_t)value; |
| 97 | } |
| 98 | |
| 99 | void SkKernel33MaskFilter::flatten(SkFlattenableWriteBuffer& wb) |
| 100 | { |
| 101 | this->INHERITED::flatten(wb); |
| 102 | wb.writeMul4(fKernel, 9 * sizeof(int)); |
| 103 | wb.write32(fShift); |
| 104 | } |
| 105 | |
| 106 | SkFlattenable::Factory SkKernel33MaskFilter::getFactory() |
| 107 | { |
| 108 | return Create; |
| 109 | } |
| 110 | |
| 111 | SkFlattenable* SkKernel33MaskFilter::Create(SkFlattenableReadBuffer& rb) |
| 112 | { |
| 113 | return new SkKernel33MaskFilter(rb); |
| 114 | } |
| 115 | |
| 116 | SkKernel33MaskFilter::SkKernel33MaskFilter(SkFlattenableReadBuffer& rb) |
| 117 | : SkKernel33ProcMaskFilter(rb) |
| 118 | { |
| 119 | rb.read(fKernel, 9 * sizeof(int)); |
| 120 | fShift = rb.readS32(); |
| 121 | } |
| 122 | |