1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/* 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright 2011 Google Inc. 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Use of this source code is governed by a BSD-style license that can be 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * found in the LICENSE file. 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "SkTableMaskFilter.h" 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "SkReadBuffer.h" 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "SkWriteBuffer.h" 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "SkString.h" 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 15324c4644fee44b9898524c09511bd33c3f12e2dfBen GruverSkTableMaskFilter::SkTableMaskFilter() { 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver for (int i = 0; i < 256; i++) { 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver fTable[i] = i; 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver} 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 21324c4644fee44b9898524c09511bd33c3f12e2dfBen GruverSkTableMaskFilter::SkTableMaskFilter(const uint8_t table[256]) { 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver memcpy(fTable, table, sizeof(fTable)); 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver} 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 25324c4644fee44b9898524c09511bd33c3f12e2dfBen GruverSkTableMaskFilter::~SkTableMaskFilter() {} 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverbool SkTableMaskFilter::filterMask(SkMask* dst, const SkMask& src, 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const SkMatrix&, SkIPoint* margin) const { 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (src.fFormat != SkMask::kA8_Format) { 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return false; 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver dst->fBounds = src.fBounds; 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver dst->fRowBytes = SkAlign4(dst->fBounds.width()); 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver dst->fFormat = SkMask::kA8_Format; 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver dst->fImage = NULL; 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (src.fImage) { 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver dst->fImage = SkMask::AllocImage(dst->computeImageSize()); 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const uint8_t* srcP = src.fImage; 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver uint8_t* dstP = dst->fImage; 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const uint8_t* table = fTable; 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int dstWidth = dst->fBounds.width(); 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int extraZeros = dst->fRowBytes - dstWidth; 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver for (int y = dst->fBounds.height() - 1; y >= 0; --y) { 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver for (int x = dstWidth - 1; x >= 0; --x) { 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver dstP[x] = table[srcP[x]]; 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 51 srcP += src.fRowBytes; 52 // we can't just inc dstP by rowbytes, because if it has any 53 // padding between its width and its rowbytes, we need to zero those 54 // so that the bitters can read those safely if that is faster for 55 // them 56 dstP += dstWidth; 57 for (int i = extraZeros - 1; i >= 0; --i) { 58 *dstP++ = 0; 59 } 60 } 61 } 62 63 if (margin) { 64 margin->set(0, 0); 65 } 66 return true; 67} 68 69SkMask::Format SkTableMaskFilter::getFormat() const { 70 return SkMask::kA8_Format; 71} 72 73void SkTableMaskFilter::flatten(SkWriteBuffer& wb) const { 74 wb.writeByteArray(fTable, 256); 75} 76 77SkFlattenable* SkTableMaskFilter::CreateProc(SkReadBuffer& buffer) { 78 uint8_t table[256]; 79 if (!buffer.readByteArray(table, 256)) { 80 return NULL; 81 } 82 return Create(table); 83} 84 85#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING 86SkTableMaskFilter::SkTableMaskFilter(SkReadBuffer& rb) : INHERITED(rb) { 87 SkASSERT(256 == rb.getArrayCount()); 88 rb.readByteArray(fTable, 256); 89} 90#endif 91 92/////////////////////////////////////////////////////////////////////////////// 93 94void SkTableMaskFilter::MakeGammaTable(uint8_t table[256], SkScalar gamma) { 95 const float dx = 1 / 255.0f; 96 const float g = SkScalarToFloat(gamma); 97 98 float x = 0; 99 for (int i = 0; i < 256; i++) { 100 // float ee = powf(x, g) * 255; 101 table[i] = SkPin32(sk_float_round2int(powf(x, g) * 255), 0, 255); 102 x += dx; 103 } 104} 105 106void SkTableMaskFilter::MakeClipTable(uint8_t table[256], uint8_t min, 107 uint8_t max) { 108 if (0 == max) { 109 max = 1; 110 } 111 if (min >= max) { 112 min = max - 1; 113 } 114 SkASSERT(min < max); 115 116 SkFixed scale = (1 << 16) * 255 / (max - min); 117 memset(table, 0, min + 1); 118 for (int i = min + 1; i < max; i++) { 119 int value = SkFixedRoundToInt(scale * (i - min)); 120 SkASSERT(value <= 255); 121 table[i] = value; 122 } 123 memset(table + max, 255, 256 - max); 124 125#if 0 126 int j; 127 for (j = 0; j < 256; j++) { 128 if (table[j]) { 129 break; 130 } 131 } 132 SkDebugf("%d %d start [%d]", min, max, j); 133 for (; j < 256; j++) { 134 SkDebugf(" %d", table[j]); 135 } 136 SkDebugf("\n\n"); 137#endif 138} 139 140#ifndef SK_IGNORE_TO_STRING 141void SkTableMaskFilter::toString(SkString* str) const { 142 str->append("SkTableMaskFilter: ("); 143 144 str->append("table: "); 145 for (int i = 0; i < 255; ++i) { 146 str->appendf("%d, ", fTable[i]); 147 } 148 str->appendf("%d", fTable[255]); 149 150 str->append(")"); 151} 152#endif 153