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| (Empty) |
| 1 #include "SkBitmap.h" | |
| 2 #include "SkRegion.h" | |
| 3 | |
| 4 bool SkBitmap::scrollRect(const SkIRect* subset, int dx, int dy, | |
| 5 SkRegion* inval) const | |
| 6 { | |
| 7 if (NULL != subset) { | |
| 8 SkBitmap tmp; | |
| 9 | |
| 10 return this->extractSubset(&tmp, *subset) && | |
| 11 // now call again with no rectangle | |
| 12 tmp.scrollRect(NULL, dx, dy, inval); | |
| 13 } | |
| 14 | |
| 15 int shift; | |
| 16 | |
| 17 switch (this->config()) { | |
| 18 case kIndex8_Config: | |
| 19 case kA8_Config: | |
| 20 shift = 0; | |
| 21 break; | |
| 22 case kARGB_4444_Config: | |
| 23 case kRGB_565_Config: | |
| 24 shift = 1; | |
| 25 break; | |
| 26 case kARGB_8888_Config: | |
| 27 shift = 2; | |
| 28 break; | |
| 29 default: | |
| 30 // can't scroll this config | |
| 31 return false; | |
| 32 } | |
| 33 | |
| 34 int width = this->width(); | |
| 35 int height = this->height(); | |
| 36 | |
| 37 // check if there's nothing to do | |
| 38 if ((dx | dy) == 0 || width <= 0 || height <= 0) { | |
| 39 if (NULL != inval) { | |
| 40 inval->setEmpty(); | |
| 41 } | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 // compute the inval region now, before we see if there are any pixels | |
| 46 if (NULL != inval) { | |
| 47 SkIRect r; | |
| 48 | |
| 49 r.set(0, 0, width, height); | |
| 50 // initial the region with the entire bounds | |
| 51 inval->setRect(r); | |
| 52 // do the "scroll" | |
| 53 r.offset(dx, dy); | |
| 54 | |
| 55 // check if we scrolled completely away | |
| 56 if (!SkIRect::Intersects(r, inval->getBounds())) { | |
| 57 // inval has already been updated... | |
| 58 return true; | |
| 59 } | |
| 60 | |
| 61 // compute the dirty area | |
| 62 inval->op(r, SkRegion::kDifference_Op); | |
| 63 } | |
| 64 | |
| 65 SkAutoLockPixels alp(*this); | |
| 66 // if we have no pixels, just return (inval is already updated) | |
| 67 // don't call readyToDraw(), since we don't require a colortable per se | |
| 68 if (this->getPixels() == NULL) { | |
| 69 return true; | |
| 70 } | |
| 71 | |
| 72 // if we get this far, then we need to shift the pixels | |
| 73 | |
| 74 char* dst = (char*)this->getPixels(); | |
| 75 const char* src = dst; | |
| 76 int rowBytes = this->rowBytes(); // need rowBytes to be signed | |
| 77 | |
| 78 if (dy <= 0) { | |
| 79 src -= dy * rowBytes; | |
| 80 height += dy; | |
| 81 } else { | |
| 82 dst += dy * rowBytes; | |
| 83 height -= dy; | |
| 84 // now jump src/dst to the last scanline | |
| 85 src += (height - 1) * rowBytes; | |
| 86 dst += (height - 1) * rowBytes; | |
| 87 // now invert rowbytes so we copy backwards in the loop | |
| 88 rowBytes = -rowBytes; | |
| 89 } | |
| 90 | |
| 91 if (dx <= 0) { | |
| 92 src -= dx << shift; | |
| 93 width += dx; | |
| 94 } else { | |
| 95 dst += dx << shift; | |
| 96 width -= dx; | |
| 97 } | |
| 98 | |
| 99 width <<= shift; // now width is the number of bytes to move per line | |
| 100 while (--height >= 0) { | |
| 101 memmove(dst, src, width); | |
| 102 dst += rowBytes; | |
| 103 src += rowBytes; | |
| 104 } | |
| 105 return true; | |
| 106 } | |
| 107 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/