1 /* 2 * CAUTION: EXPERIMENTAL CODE 3 * 4 * This code is not to be used and will not be supported 5 * if it fails on you. DO NOT USE! 6 * 7 */ 8 9 #include "SkPathUtils.h" 10 11 #include "SkPath.h" 12 #include "SkPathOps.h" // this can't be found, how do I link it? 13 #include "SkRegion.h" 14 15 typedef void (*line2path)(SkPath*, const char*, int, int); 16 #define SQRT_2 1.41421356237f 17 #define ON 0xFF000000 // black pixel 18 #define OFF 0x00000000 // transparent pixel 19 20 // assumes stride is in bytes 21 /* 22 static void FillRandomBits( int chars, char* bits ){ 23 SkTime time; 24 SkRandom rand = SkRandom( time.GetMSecs() ); 25 26 for (int i = 0; i < chars; ++i){ 27 bits[i] = rand.nextU(); 28 } 29 }OA 30 */ 31 32 static int GetBit( const char* buffer, int x ) { 33 int byte = x >> 3; 34 int bit = x & 7; 35 36 return buffer[byte] & (128 >> bit); 37 } 38 39 /* 40 static void Line2path_pixel(SkPath* path, const char* line, 41 int lineIdx, int width) { 42 for (int i = 0; i < width; ++i) { 43 // simply makes every ON pixel into a rect path 44 if (GetBit(line,i)) { 45 path->addRect(SkRect::MakeXYWH(i, lineIdx, 1, 1), 46 SkPath::kCW_Direction); 47 } 48 } 49 } 50 51 static void Line2path_pixelCircle(SkPath* path, const char* line, 52 int lineIdx, int width) { 53 for (int i = 0; i < width; ++i) { 54 // simply makes every ON pixel into a circle path 55 if (GetBit(line,i)) { 56 path->addCircle(i + SK_ScalarHalf, 57 lineIdx + SK_ScalarHalf, 58 SQRT_2 / 2.0f); 59 } 60 } 61 } 62 */ 63 64 static void Line2path_span(SkPath* path, const char* line, 65 int lineIdx, int width) { 66 bool inRun = 0; 67 int start = 1; 68 69 for (int i = 0; i < width; ++i) { 70 int curPixel = GetBit(line,i); 71 72 if ( (curPixel!=0) != inRun ) { // if transition 73 if (curPixel) { // if transition on 74 inRun = 1; 75 start = i; // mark beginning of span 76 }else { // if transition off add the span as a path 77 inRun = 0; 78 path->addRect(SkRect::MakeXYWH(SkIntToScalar(start), SkIntToScalar(lineIdx), 79 SkIntToScalar(i-start), SK_Scalar1), 80 SkPath::kCW_Direction); 81 } 82 } 83 } 84 85 if (inRun==1) { // close any open spans 86 int end = 0; 87 if ( GetBit(line,width-1) ) ++end; 88 path->addRect(SkRect::MakeXYWH(SkIntToScalar(start), SkIntToScalar(lineIdx), 89 SkIntToScalar(width - 1 + end - start), SK_Scalar1), 90 SkPath::kCW_Direction); 91 } else if ( GetBit(line, width - 1) ) { // if last pixel on add 92 path->addRect(SkRect::MakeXYWH(width - SK_Scalar1, SkIntToScalar(lineIdx), 93 SK_Scalar1, SK_Scalar1), 94 SkPath::kCW_Direction); 95 } 96 } 97 98 void SkPathUtils::BitsToPath_Path(SkPath* path, 99 const char* bitmap, 100 int w, int h, int stride) { 101 // loop for every line in bitmap 102 for (int i = 0; i < h; ++i) { 103 // fn ptr handles each line separately 104 //l2p_fn(path, &bitmap[i*stride], i, w); 105 Line2path_span(path, &bitmap[i*stride], i, w); 106 } 107 Simplify(*path, path); // simplify resulting path. 108 } 109 110 void SkPathUtils::BitsToPath_Region(SkPath* path, 111 const char* bitmap, 112 int w, int h, int stride) { 113 SkRegion region; 114 115 // loop for each line 116 for (int y = 0; y < h; ++y){ 117 bool inRun = 0; 118 int start = 1; 119 const char* line = &bitmap[y * stride]; 120 121 // loop for each pixel 122 for (int i = 0; i < w; ++i) { 123 int curPixel = GetBit(line,i); 124 125 if ( (curPixel!=0) != inRun ) { // if transition 126 if (curPixel) { // if transition on 127 inRun = 1; 128 start = i; // mark beginning of span 129 }else { // if transition off add the span as a path 130 inRun = 0; 131 //add here 132 region.op(SkIRect::MakeXYWH(start, y, i-start, 1), 133 SkRegion::kUnion_Op ); 134 } 135 } 136 } 137 if (inRun==1) { // close any open spans 138 int end = 0; 139 if ( GetBit(line,w-1) ) ++end; 140 // add the thing here 141 region.op(SkIRect::MakeXYWH(start, y, w-1-start+end, 1), 142 SkRegion::kUnion_Op ); 143 144 } else if ( GetBit(line,w-1) ) { // if last pixel on add rect 145 // add the thing here 146 region.op(SkIRect::MakeXYWH(w-1, y, 1, 1), 147 SkRegion::kUnion_Op ); 148 } 149 } 150 // convert region to path 151 region.getBoundaryPath(path); 152 } 153
