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author | Alexander Tkachev | 2016-06-29 19:25:57 +0600 |
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committer | Eugene Sandulenko | 2016-07-03 12:21:40 +0200 |
commit | 05383532b7da1a2ed669d03ee9ca8aa9e6bdcdf1 (patch) | |
tree | 16affdf31b26c8fb816e9c8267a51d59803597d0 /graphics/VectorRendererSpec.cpp | |
parent | 2231de040f37502031686edf62f501a02ae6d1c4 (diff) | |
download | scummvm-rg350-05383532b7da1a2ed669d03ee9ca8aa9e6bdcdf1.tar.gz scummvm-rg350-05383532b7da1a2ed669d03ee9ca8aa9e6bdcdf1.tar.bz2 scummvm-rg350-05383532b7da1a2ed669d03ee9ca8aa9e6bdcdf1.zip |
GUI: Add drawLineClip()
Diffstat (limited to 'graphics/VectorRendererSpec.cpp')
-rw-r--r-- | graphics/VectorRendererSpec.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/graphics/VectorRendererSpec.cpp b/graphics/VectorRendererSpec.cpp index cbabdc7caf..3011601168 100644 --- a/graphics/VectorRendererSpec.cpp +++ b/graphics/VectorRendererSpec.cpp @@ -1030,6 +1030,77 @@ drawLine(int x1, int y1, int x2, int y2) { } } +template<typename PixelType> +void VectorRendererSpec<PixelType>:: +drawLineClip(int x1, int y1, int x2, int y2, Common::Rect clipping) { + x1 = CLIP(x1, 0, (int)Base::_activeSurface->w); + x2 = CLIP(x2, 0, (int)Base::_activeSurface->w); + y1 = CLIP(y1, 0, (int)Base::_activeSurface->h); + y2 = CLIP(y2, 0, (int)Base::_activeSurface->h); + + // we draw from top to bottom + if (y2 < y1) { + SWAP(x1, x2); + SWAP(y1, y2); + } + + uint dx = ABS(x2 - x1); + uint dy = ABS(y2 - y1); + + // this is a point, not a line. stoopid. + if (dy == 0 && dx == 0) + return; + + if (Base::_strokeWidth == 0) + return; + + PixelType *ptr = (PixelType *)_activeSurface->getBasePtr(x1, y1); + int pitch = _activeSurface->pitch / _activeSurface->format.bytesPerPixel; + int st = Base::_strokeWidth >> 1; + + Common::Rect backup = _clippingArea; + _clippingArea = clipping; + bool needsClipping = !_clippingArea.isEmpty() && (!_clippingArea.contains(x1, y1) || !_clippingArea.contains(x2, y2)); + if (!needsClipping) { + drawLine(x1, y1, x2, y2); + _clippingArea = backup; + return; + } + + int ptr_x = x1, ptr_y = y1; + + if (dy == 0) { // horizontal lines + colorFillClip<PixelType>(ptr, ptr + dx + 1, (PixelType)_fgColor, x1, y1, _clippingArea); + + for (int i = 0, p = pitch; i < st; ++i, p += pitch) { + colorFillClip<PixelType>(ptr + p, ptr + dx + 1 + p, (PixelType)_fgColor, x1, y1 + p/pitch, _clippingArea); + colorFillClip<PixelType>(ptr - p, ptr + dx + 1 - p, (PixelType)_fgColor, x1, y1 - p/pitch, _clippingArea); + } + + } else if (dx == 0) { // vertical lines + // these ones use a static pitch increase. + while (y1++ <= y2) { + colorFillClip<PixelType>(ptr - st, ptr + st, (PixelType)_fgColor, x1 - st, ptr_y, _clippingArea); + ptr += pitch; + ++ptr_y; + } + + } else if (dx == dy) { // diagonal lines + // these ones also use a fixed pitch increase + pitch += (x2 > x1) ? 1 : -1; + + while (dy--) { + colorFillClip<PixelType>(ptr - st, ptr + st, (PixelType)_fgColor, ptr_x - st, ptr_y, _clippingArea); + ptr += pitch; + ++ptr_y; + if (x2 > x1) ++ptr_x; else --ptr_x; + } + + } else { // generic lines, use the standard algorithm... + drawLineAlgClip(x1, y1, x2, y2, dx, dy, (PixelType)_fgColor); + } +} + /** CIRCLES **/ template<typename PixelType> void VectorRendererSpec<PixelType>:: @@ -1872,6 +1943,59 @@ drawLineAlg(int x1, int y1, int x2, int y2, uint dx, uint dy, PixelType color) { *ptr = (PixelType)color; } +template<typename PixelType> +void VectorRendererSpec<PixelType>:: +drawLineAlgClip(int x1, int y1, int x2, int y2, uint dx, uint dy, PixelType color) { + PixelType *ptr = (PixelType *)_activeSurface->getBasePtr(x1, y1); + int pitch = _activeSurface->pitch / _activeSurface->format.bytesPerPixel; + int xdir = (x2 > x1) ? 1 : -1; + int ptr_x = x1, ptr_y = y1; + + if (IS_IN_CLIP(ptr_x, ptr_y)) *ptr = (PixelType)color; + + if (dx > dy) { + int ddy = dy * 2; + int dysub = ddy - (dx * 2); + int error_term = ddy - dx; + + while (dx--) { + if (error_term >= 0) { + ptr += pitch; + ++ptr_y; + error_term += dysub; + } else { + error_term += ddy; + } + + ptr += xdir; + ptr_x += xdir; + if (IS_IN_CLIP(ptr_x, ptr_y)) *ptr = (PixelType)color; + } + } else { + int ddx = dx * 2; + int dxsub = ddx - (dy * 2); + int error_term = ddx - dy; + + while (dy--) { + if (error_term >= 0) { + ptr += xdir; + ptr_x += xdir; + error_term += dxsub; + } else { + error_term += ddx; + } + + ptr += pitch; + ++ptr_y; + if (IS_IN_CLIP(ptr_x, ptr_y)) *ptr = (PixelType)color; + } + } + + ptr = (PixelType *)_activeSurface->getBasePtr(x2, y2); + ptr_x = x2; ptr_y = y2; + if (IS_IN_CLIP(ptr_x, ptr_y)) *ptr = (PixelType)color; +} + /** VERTICAL TRIANGLE DRAWING ALGORITHM **/ /** FIXED POINT ARITHMETIC |