--- a/egl/sfopenvg/riPixelPipe.cpp Fri Sep 24 16:48:05 2010 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,894 +0,0 @@
-/*------------------------------------------------------------------------
- *
- * OpenVG 1.1 Reference Implementation
- * -----------------------------------
- *
- * Copyright (c) 2007 The Khronos Group Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and /or associated documentation files
- * (the "Materials "), to deal in the Materials without restriction,
- * including without limitation the rights to use, copy, modify, merge,
- * publish, distribute, sublicense, and/or sell copies of the Materials,
- * and to permit persons to whom the Materials are furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Materials.
- *
- * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR
- * THE USE OR OTHER DEALINGS IN THE MATERIALS.
- *
- *//**
- * \file
- * \brief Implementation of Paint and pixel pipe functionality.
- * \note
- *//*-------------------------------------------------------------------*/
-
-#include "riPixelPipe.h"
-
-//==============================================================================================
-
-namespace OpenVGRI
-{
-
-/*-------------------------------------------------------------------*//*!
-* \brief Paint constructor.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-Paint::Paint() :
- m_paintType(VG_PAINT_TYPE_COLOR),
- m_paintColor(0,0,0,1,Color::sRGBA_PRE),
- m_inputPaintColor(0,0,0,1,Color::sRGBA),
- m_colorRampSpreadMode(VG_COLOR_RAMP_SPREAD_PAD),
- m_colorRampStops(),
- m_inputColorRampStops(),
- m_colorRampPremultiplied(VG_TRUE),
- m_inputLinearGradientPoint0(0,0),
- m_inputLinearGradientPoint1(1,0),
- m_inputRadialGradientCenter(0,0),
- m_inputRadialGradientFocalPoint(0,0),
- m_inputRadialGradientRadius(1.0f),
- m_linearGradientPoint0(0,0),
- m_linearGradientPoint1(1,0),
- m_radialGradientCenter(0,0),
- m_radialGradientFocalPoint(0,0),
- m_radialGradientRadius(1.0f),
- m_patternTilingMode(VG_TILE_FILL),
- m_pattern(NULL),
- m_referenceCount(0)
-{
- Paint::GradientStop gs;
- gs.offset = 0.0f;
- gs.color.set(0,0,0,1,Color::sRGBA);
- m_colorRampStops.push_back(gs); //throws bad_alloc
- gs.offset = 1.0f;
- gs.color.set(1,1,1,1,Color::sRGBA);
- m_colorRampStops.push_back(gs); //throws bad_alloc
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Paint destructor.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-Paint::~Paint()
-{
- RI_ASSERT(m_referenceCount == 0);
- if(m_pattern)
- {
- m_pattern->removeInUse();
- if(!m_pattern->removeReference())
- RI_DELETE(m_pattern);
- }
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief PixelPipe constructor.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-PixelPipe::PixelPipe() :
- m_drawable(NULL),
- m_image(NULL),
- m_paint(NULL),
- m_defaultPaint(),
- m_blendMode(VG_BLEND_SRC_OVER),
- m_imageMode(VG_DRAW_IMAGE_NORMAL),
- m_imageQuality(VG_IMAGE_QUALITY_FASTER),
- m_tileFillColor(0,0,0,0,Color::sRGBA),
- m_colorTransform(false),
- m_colorTransformValues(),
- m_surfaceToPaintMatrix(),
- m_surfaceToImageMatrix()
-{
- for(int i=0;i<8;i++)
- m_colorTransformValues[i] = (i < 4) ? 1.0f : 0.0f;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief PixelPipe destructor.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-PixelPipe::~PixelPipe()
-{
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets the rendering surface.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setDrawable(Drawable* drawable)
-{
- RI_ASSERT(drawable);
- m_drawable = drawable;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets the blend mode.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setBlendMode(VGBlendMode blendMode)
-{
- RI_ASSERT(blendMode >= VG_BLEND_SRC && blendMode <= VG_BLEND_ADDITIVE);
- m_blendMode = blendMode;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets the mask image. NULL disables masking.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setMask(bool masking)
-{
- m_masking = masking;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets the image to be drawn. NULL disables image drawing.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setImage(Image* image, VGImageMode imageMode)
-{
- RI_ASSERT(imageMode == VG_DRAW_IMAGE_NORMAL || imageMode == VG_DRAW_IMAGE_MULTIPLY || imageMode == VG_DRAW_IMAGE_STENCIL);
- m_image = image;
- m_imageMode = imageMode;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets the surface-to-paint matrix.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setSurfaceToPaintMatrix(const Matrix3x3& surfaceToPaintMatrix)
-{
- m_surfaceToPaintMatrix = surfaceToPaintMatrix;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets the surface-to-image matrix.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setSurfaceToImageMatrix(const Matrix3x3& surfaceToImageMatrix)
-{
- m_surfaceToImageMatrix = surfaceToImageMatrix;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets image quality.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setImageQuality(VGImageQuality imageQuality)
-{
- RI_ASSERT(imageQuality == VG_IMAGE_QUALITY_NONANTIALIASED || imageQuality == VG_IMAGE_QUALITY_FASTER || imageQuality == VG_IMAGE_QUALITY_BETTER);
- m_imageQuality = imageQuality;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets fill color for VG_TILE_FILL tiling mode (pattern only).
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setTileFillColor(const Color& c)
-{
- m_tileFillColor = c;
- m_tileFillColor.clamp();
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Sets paint.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setPaint(const Paint* paint)
-{
- m_paint = paint;
- if(!m_paint)
- m_paint = &m_defaultPaint;
- if(m_paint->m_pattern)
- m_tileFillColor.convert(m_paint->m_pattern->getDescriptor().internalFormat);
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Color transform.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::setColorTransform(bool enable, RIfloat values[8])
-{
- m_colorTransform = enable;
- for(int i=0;i<4;i++)
- {
- m_colorTransformValues[i] = RI_CLAMP(values[i], -127.0f, 127.0f);
- m_colorTransformValues[i+4] = RI_CLAMP(values[i+4], -1.0f, 1.0f);
- }
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Computes the linear gradient function at (x,y).
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::linearGradient(RIfloat& g, RIfloat& rho, RIfloat x, RIfloat y) const
-{
- RI_ASSERT(m_paint);
- Vector2 u = m_paint->m_linearGradientPoint1 - m_paint->m_linearGradientPoint0;
- RIfloat usq = dot(u,u);
- if( usq <= 0.0f )
- { //points are equal, gradient is always 1.0f
- g = 1.0f;
- rho = 0.0f;
- return;
- }
- RIfloat oou = 1.0f / usq;
-
- Vector2 p(x, y);
- p = affineTransform(m_surfaceToPaintMatrix, p);
- p -= m_paint->m_linearGradientPoint0;
- RI_ASSERT(usq >= 0.0f);
- g = dot(p, u) * oou;
- RIfloat dgdx = oou * u.x * m_surfaceToPaintMatrix[0][0] + oou * u.y * m_surfaceToPaintMatrix[1][0];
- RIfloat dgdy = oou * u.x * m_surfaceToPaintMatrix[0][1] + oou * u.y * m_surfaceToPaintMatrix[1][1];
- rho = (RIfloat)sqrt(dgdx*dgdx + dgdy*dgdy);
- RI_ASSERT(rho >= 0.0f);
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Computes the radial gradient function at (x,y).
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::radialGradient(RIfloat &g, RIfloat &rho, RIfloat x, RIfloat y) const
-{
- RI_ASSERT(m_paint);
- if( m_paint->m_radialGradientRadius <= 0.0f )
- {
- g = 1.0f;
- rho = 0.0f;
- return;
- }
-
- RIfloat r = m_paint->m_radialGradientRadius;
- Vector2 c = m_paint->m_radialGradientCenter;
- Vector2 f = m_paint->m_radialGradientFocalPoint;
- Vector2 gx(m_surfaceToPaintMatrix[0][0], m_surfaceToPaintMatrix[1][0]);
- Vector2 gy(m_surfaceToPaintMatrix[0][1], m_surfaceToPaintMatrix[1][1]);
-
- Vector2 fp = f - c;
-
- //clamp the focal point inside the gradient circle
- RIfloat fpLen = fp.length();
- if( fpLen > 0.999f * r )
- fp *= 0.999f * r / fpLen;
-
- RIfloat D = -1.0f / (dot(fp,fp) - r*r);
- Vector2 p(x, y);
- p = affineTransform(m_surfaceToPaintMatrix, p) - c;
- Vector2 d = p - fp;
- RIfloat s = (RIfloat)sqrt(r*r*dot(d,d) - RI_SQR(p.x*fp.y - p.y*fp.x));
- g = (dot(fp,d) + s) * D;
- if(RI_ISNAN(g))
- g = 0.0f;
- RIfloat dgdx = D*dot(fp,gx) + (r*r*dot(d,gx) - (gx.x*fp.y - gx.y*fp.x)*(p.x*fp.y - p.y*fp.x)) * (D / s);
- RIfloat dgdy = D*dot(fp,gy) + (r*r*dot(d,gy) - (gy.x*fp.y - gy.y*fp.x)*(p.x*fp.y - p.y*fp.x)) * (D / s);
- rho = (RIfloat)sqrt(dgdx*dgdx + dgdy*dgdy);
- if(RI_ISNAN(rho))
- rho = 0.0f;
- RI_ASSERT(rho >= 0.0f);
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Returns the average color within an offset range in the color ramp.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-static Color readStopColor(const Array<Paint::GradientStop>& colorRampStops, int i, VGboolean colorRampPremultiplied)
-{
- RI_ASSERT(i >= 0 && i < colorRampStops.size());
- Color c = colorRampStops[i].color;
- RI_ASSERT(c.getInternalFormat() == Color::sRGBA);
- if(colorRampPremultiplied)
- c.premultiply();
- return c;
-}
-
-Color PixelPipe::integrateColorRamp(RIfloat gmin, RIfloat gmax) const
-{
- RI_ASSERT(gmin <= gmax);
- RI_ASSERT(gmin >= 0.0f && gmin <= 1.0f);
- RI_ASSERT(gmax >= 0.0f && gmax <= 1.0f);
- RI_ASSERT(m_paint->m_colorRampStops.size() >= 2); //there are at least two stops
-
- Color c(0,0,0,0,m_paint->m_colorRampPremultiplied ? Color::sRGBA_PRE : Color::sRGBA);
- if(gmin == 1.0f || gmax == 0.0f)
- return c;
-
- int i=0;
- for(;i<m_paint->m_colorRampStops.size()-1;i++)
- {
- if(gmin >= m_paint->m_colorRampStops[i].offset && gmin < m_paint->m_colorRampStops[i+1].offset)
- {
- RIfloat s = m_paint->m_colorRampStops[i].offset;
- RIfloat e = m_paint->m_colorRampStops[i+1].offset;
- RI_ASSERT(s < e);
- RIfloat g = (gmin - s) / (e - s);
-
- Color sc = readStopColor(m_paint->m_colorRampStops, i, m_paint->m_colorRampPremultiplied);
- Color ec = readStopColor(m_paint->m_colorRampStops, i+1, m_paint->m_colorRampPremultiplied);
- Color rc = (1.0f-g) * sc + g * ec;
-
- //subtract the average color from the start of the stop to gmin
- c -= 0.5f*(gmin - s)*(sc + rc);
- break;
- }
- }
-
- for(;i<m_paint->m_colorRampStops.size()-1;i++)
- {
- RIfloat s = m_paint->m_colorRampStops[i].offset;
- RIfloat e = m_paint->m_colorRampStops[i+1].offset;
- RI_ASSERT(s <= e);
-
- Color sc = readStopColor(m_paint->m_colorRampStops, i, m_paint->m_colorRampPremultiplied);
- Color ec = readStopColor(m_paint->m_colorRampStops, i+1, m_paint->m_colorRampPremultiplied);
-
- //average of the stop
- c += 0.5f*(e-s)*(sc + ec);
-
- if(gmax >= m_paint->m_colorRampStops[i].offset && gmax < m_paint->m_colorRampStops[i+1].offset)
- {
- RIfloat g = (gmax - s) / (e - s);
- Color rc = (1.0f-g) * sc + g * ec;
-
- //subtract the average color from gmax to the end of the stop
- c -= 0.5f*(e - gmax)*(rc + ec);
- break;
- }
- }
- return c;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Maps a gradient function value to a color.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-Color PixelPipe::colorRamp(RIfloat gradient, RIfloat rho) const
-{
- RI_ASSERT(m_paint);
- RI_ASSERT(rho >= 0.0f);
-
- Color c(0,0,0,0,m_paint->m_colorRampPremultiplied ? Color::sRGBA_PRE : Color::sRGBA);
- Color avg;
-
- if(rho == 0.0f)
- { //filter size is zero or gradient is degenerate
- switch(m_paint->m_colorRampSpreadMode)
- {
- case VG_COLOR_RAMP_SPREAD_PAD:
- gradient = RI_CLAMP(gradient, 0.0f, 1.0f);
- break;
- case VG_COLOR_RAMP_SPREAD_REFLECT:
- {
- RIfloat g = RI_MOD(gradient, 2.0f);
- gradient = (g < 1.0f) ? g : 2.0f - g;
- break;
- }
- default:
- RI_ASSERT(m_paint->m_colorRampSpreadMode == VG_COLOR_RAMP_SPREAD_REPEAT);
- gradient = gradient - (RIfloat)floor(gradient);
- break;
- }
- RI_ASSERT(gradient >= 0.0f && gradient <= 1.0f);
-
- for(int i=0;i<m_paint->m_colorRampStops.size()-1;i++)
- {
- if(gradient >= m_paint->m_colorRampStops[i].offset && gradient < m_paint->m_colorRampStops[i+1].offset)
- {
- RIfloat s = m_paint->m_colorRampStops[i].offset;
- RIfloat e = m_paint->m_colorRampStops[i+1].offset;
- RI_ASSERT(s < e);
- RIfloat g = RI_CLAMP((gradient - s) / (e - s), 0.0f, 1.0f); //clamp needed due to numerical inaccuracies
-
- Color sc = readStopColor(m_paint->m_colorRampStops, i, m_paint->m_colorRampPremultiplied);
- Color ec = readStopColor(m_paint->m_colorRampStops, i+1, m_paint->m_colorRampPremultiplied);
- return (1.0f-g) * sc + g * ec; //return interpolated value
- }
- }
- return readStopColor(m_paint->m_colorRampStops, m_paint->m_colorRampStops.size()-1, m_paint->m_colorRampPremultiplied);
- }
-
- RIfloat gmin = gradient - rho*0.5f; //filter starting from the gradient point (if starts earlier, radial gradient center will be an average of the first and the last stop, which doesn't look good)
- RIfloat gmax = gradient + rho*0.5f;
-
- switch(m_paint->m_colorRampSpreadMode)
- {
- case VG_COLOR_RAMP_SPREAD_PAD:
- {
- if(gmin < 0.0f)
- c += (RI_MIN(gmax, 0.0f) - gmin) * readStopColor(m_paint->m_colorRampStops, 0, m_paint->m_colorRampPremultiplied);
- if(gmax > 1.0f)
- c += (gmax - RI_MAX(gmin, 1.0f)) * readStopColor(m_paint->m_colorRampStops, m_paint->m_colorRampStops.size()-1, m_paint->m_colorRampPremultiplied);
- gmin = RI_CLAMP(gmin, 0.0f, 1.0f);
- gmax = RI_CLAMP(gmax, 0.0f, 1.0f);
- c += integrateColorRamp(gmin, gmax);
- c *= 1.0f/rho;
- c.clamp(); //clamp needed due to numerical inaccuracies
- return c;
- }
-
- case VG_COLOR_RAMP_SPREAD_REFLECT:
- {
- avg = integrateColorRamp(0.0f, 1.0f);
- RIfloat gmini = (RIfloat)floor(gmin);
- RIfloat gmaxi = (RIfloat)floor(gmax);
- c = (gmaxi + 1.0f - gmini) * avg; //full ramps
-
- //subtract beginning
- if(((int)gmini) & 1)
- c -= integrateColorRamp(RI_CLAMP(1.0f - (gmin - gmini), 0.0f, 1.0f), 1.0f);
- else
- c -= integrateColorRamp(0.0f, RI_CLAMP(gmin - gmini, 0.0f, 1.0f));
-
- //subtract end
- if(((int)gmaxi) & 1)
- c -= integrateColorRamp(0.0f, RI_CLAMP(1.0f - (gmax - gmaxi), 0.0f, 1.0f));
- else
- c -= integrateColorRamp(RI_CLAMP(gmax - gmaxi, 0.0f, 1.0f), 1.0f);
- break;
- }
-
- default:
- {
- RI_ASSERT(m_paint->m_colorRampSpreadMode == VG_COLOR_RAMP_SPREAD_REPEAT);
- avg = integrateColorRamp(0.0f, 1.0f);
- RIfloat gmini = (RIfloat)floor(gmin);
- RIfloat gmaxi = (RIfloat)floor(gmax);
- c = (gmaxi + 1.0f - gmini) * avg; //full ramps
- c -= integrateColorRamp(0.0f, RI_CLAMP(gmin - gmini, 0.0f, 1.0f)); //subtract beginning
- c -= integrateColorRamp(RI_CLAMP(gmax - gmaxi, 0.0f, 1.0f), 1.0f); //subtract end
- break;
- }
- }
-
- //divide color by the length of the range
- c *= 1.0f / rho;
- c.clamp(); //clamp needed due to numerical inaccuracies
-
- //hide aliasing by fading to the average color
- const RIfloat fadeStart = 0.5f;
- const RIfloat fadeMultiplier = 2.0f; //the larger, the earlier fade to average is done
-
- if(rho < fadeStart)
- return c;
-
- RIfloat ratio = RI_MIN((rho - fadeStart) * fadeMultiplier, 1.0f);
- return ratio * avg + (1.0f - ratio) * c;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Computes blend.
-* \param
-* \return
-* \note premultiplied blending formulas
- //src
- a = asrc
- r = rsrc
- //src over
- a = asrc + adst * (1-asrc)
- r = rsrc + rdst * (1-asrc)
- //dst over
- a = asrc * (1-adst) + adst
- r = rsrc * (1-adst) + adst
- //src in
- a = asrc * adst
- r = rsrc * adst
- //dst in
- a = adst * asrc
- r = rdst * asrc
- //multiply
- a = asrc + adst * (1-asrc)
- r = rsrc * (1-adst) + rdst * (1-asrc) + rsrc * rdst
- //screen
- a = asrc + adst * (1-asrc)
- r = rsrc + rdst - rsrc * rdst
- //darken
- a = asrc + adst * (1-asrc)
- r = MIN(rsrc + rdst * (1-asrc), rdst + rsrc * (1-adst))
- //lighten
- a = asrc + adst * (1-asrc)
- r = MAX(rsrc + rdst * (1-asrc), rdst + rsrc * (1-adst))
- //additive
- a = MIN(asrc+adst,1)
- r = rsrc + rdst
-*//*-------------------------------------------------------------------*/
-
-Color PixelPipe::blend(const Color& s, RIfloat ar, RIfloat ag, RIfloat ab, const Color& d, VGBlendMode blendMode) const
-{
- //apply blending in the premultiplied format
- Color r(0,0,0,0,d.getInternalFormat());
- RI_ASSERT(s.a >= 0.0f && s.a <= 1.0f);
- RI_ASSERT(s.r >= 0.0f && s.r <= s.a && s.r <= ar);
- RI_ASSERT(s.g >= 0.0f && s.g <= s.a && s.g <= ag);
- RI_ASSERT(s.b >= 0.0f && s.b <= s.a && s.b <= ab);
- RI_ASSERT(d.a >= 0.0f && d.a <= 1.0f);
- RI_ASSERT(d.r >= 0.0f && d.r <= d.a);
- RI_ASSERT(d.g >= 0.0f && d.g <= d.a);
- RI_ASSERT(d.b >= 0.0f && d.b <= d.a);
- switch(blendMode)
- {
- case VG_BLEND_SRC:
- r = s;
- break;
-
- case VG_BLEND_SRC_OVER:
- r.r = s.r + d.r * (1.0f - ar);
- r.g = s.g + d.g * (1.0f - ag);
- r.b = s.b + d.b * (1.0f - ab);
- r.a = s.a + d.a * (1.0f - s.a);
- break;
-
- case VG_BLEND_DST_OVER:
- r.r = s.r * (1.0f - d.a) + d.r;
- r.g = s.g * (1.0f - d.a) + d.g;
- r.b = s.b * (1.0f - d.a) + d.b;
- r.a = s.a * (1.0f - d.a) + d.a;
- break;
-
- case VG_BLEND_SRC_IN:
- r.r = s.r * d.a;
- r.g = s.g * d.a;
- r.b = s.b * d.a;
- r.a = s.a * d.a;
- break;
-
- case VG_BLEND_DST_IN:
- r.r = d.r * ar;
- r.g = d.g * ag;
- r.b = d.b * ab;
- r.a = d.a * s.a;
- break;
-
- case VG_BLEND_MULTIPLY:
- r.r = s.r * (1.0f - d.a + d.r) + d.r * (1.0f - ar);
- r.g = s.g * (1.0f - d.a + d.g) + d.g * (1.0f - ag);
- r.b = s.b * (1.0f - d.a + d.b) + d.b * (1.0f - ab);
- r.a = s.a + d.a * (1.0f - s.a);
- break;
-
- case VG_BLEND_SCREEN:
- r.r = s.r + d.r * (1.0f - s.r);
- r.g = s.g + d.g * (1.0f - s.g);
- r.b = s.b + d.b * (1.0f - s.b);
- r.a = s.a + d.a * (1.0f - s.a);
- break;
-
- case VG_BLEND_DARKEN:
- r.r = RI_MIN(s.r + d.r * (1.0f - ar), d.r + s.r * (1.0f - d.a));
- r.g = RI_MIN(s.g + d.g * (1.0f - ag), d.g + s.g * (1.0f - d.a));
- r.b = RI_MIN(s.b + d.b * (1.0f - ab), d.b + s.b * (1.0f - d.a));
- r.a = s.a + d.a * (1.0f - s.a);
- break;
-
- case VG_BLEND_LIGHTEN:
- r.r = RI_MAX(s.r + d.r * (1.0f - ar), d.r + s.r * (1.0f - d.a));
- r.g = RI_MAX(s.g + d.g * (1.0f - ag), d.g + s.g * (1.0f - d.a));
- r.b = RI_MAX(s.b + d.b * (1.0f - ab), d.b + s.b * (1.0f - d.a));
- //although the statement below is equivalent to r.a = s.a + d.a * (1.0f - s.a)
- //in practice there can be a very slight difference because
- //of the max operation in the blending formula that may cause color to exceed alpha.
- //Because of this, we compute the result both ways and return the maximum.
- r.a = RI_MAX(s.a + d.a * (1.0f - s.a), d.a + s.a * (1.0f - d.a));
- break;
-
- default:
- RI_ASSERT(blendMode == VG_BLEND_ADDITIVE);
- r.r = RI_MIN(s.r + d.r, 1.0f);
- r.g = RI_MIN(s.g + d.g, 1.0f);
- r.b = RI_MIN(s.b + d.b, 1.0f);
- r.a = RI_MIN(s.a + d.a, 1.0f);
- break;
- }
- return r;
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Applies color transform.
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::colorTransform(Color& c) const
-{
- if(m_colorTransform)
- {
- c.unpremultiply();
- c.luminanceToRGB();
- c.r = c.r * m_colorTransformValues[0] + m_colorTransformValues[4];
- c.g = c.g * m_colorTransformValues[1] + m_colorTransformValues[5];
- c.b = c.b * m_colorTransformValues[2] + m_colorTransformValues[6];
- c.a = c.a * m_colorTransformValues[3] + m_colorTransformValues[7];
- c.clamp();
- c.premultiply();
- }
-}
-
-/*-------------------------------------------------------------------*//*!
-* \brief Applies paint, image drawing, masking and blending at pixel (x,y).
-* \param
-* \return
-* \note
-*//*-------------------------------------------------------------------*/
-
-void PixelPipe::pixelPipe(int x, int y, RIfloat coverage, unsigned int sampleMask) const
-{
- RI_ASSERT(m_drawable);
- RI_ASSERT(sampleMask);
- RI_ASSERT(coverage > 0.0f);
- Color::InternalFormat dstFormat = (Color::InternalFormat)(m_drawable->getDescriptor().internalFormat | Color::PREMULTIPLIED);
-
- //evaluate paint
- RI_ASSERT(m_paint);
- Color s;
- switch(m_paint->m_paintType)
- {
- case VG_PAINT_TYPE_COLOR:
- s = m_paint->m_paintColor;
- break;
-
- case VG_PAINT_TYPE_LINEAR_GRADIENT:
- {
- RIfloat g, rho;
- linearGradient(g, rho, x+0.5f, y+0.5f);
- s = colorRamp(g, rho);
- RI_ASSERT((s.getInternalFormat() == Color::sRGBA && !m_paint->m_colorRampPremultiplied) || (s.getInternalFormat() == Color::sRGBA_PRE && m_paint->m_colorRampPremultiplied));
- s.premultiply();
- break;
- }
-
- case VG_PAINT_TYPE_RADIAL_GRADIENT:
- {
- RIfloat g, rho;
- radialGradient(g, rho, x+0.5f, y+0.5f);
- s = colorRamp(g, rho);
- RI_ASSERT((s.getInternalFormat() == Color::sRGBA && !m_paint->m_colorRampPremultiplied) || (s.getInternalFormat() == Color::sRGBA_PRE && m_paint->m_colorRampPremultiplied));
- s.premultiply();
- break;
- }
-
- default:
- RI_ASSERT(m_paint->m_paintType == VG_PAINT_TYPE_PATTERN);
- if(m_paint->m_pattern)
- s = m_paint->m_pattern->resample(x+0.5f, y+0.5f, m_surfaceToPaintMatrix, m_imageQuality, m_paint->m_patternTilingMode, m_tileFillColor);
- else
- s = m_paint->m_paintColor;
- break;
- }
- s.assertConsistency();
-
- //apply image (vgDrawImage only)
- //1. paint: convert paint to dst space
- //2. image: convert image to dst space
- //3. paint MULTIPLY image: convert paint to image number of channels, multiply with image, and convert to dst
- //4. paint STENCIL image: convert paint to dst, convert image to dst number of channels, multiply
-
- //color transform:
- //paint => transform paint color
- //image normal => transform image color
- //image multiply => transform paint*image color
- //image stencil => transform paint color
-
- RIfloat ar = 0.0f, ag = 0.0f, ab = 0.0f;
- if(m_image)
- {
- Color im = m_image->resample(x+0.5f, y+0.5f, m_surfaceToImageMatrix, m_imageQuality, VG_TILE_PAD, Color(0,0,0,0,m_image->getDescriptor().internalFormat));
- im.assertConsistency();
-
- switch(m_imageMode)
- {
- case VG_DRAW_IMAGE_NORMAL:
- s = im;
- colorTransform(s);
- ar = s.a;
- ag = s.a;
- ab = s.a;
- s.convert(dstFormat); //convert image color to destination color space
- break;
- case VG_DRAW_IMAGE_MULTIPLY:
- //the result will be in image color space, except when paint is RGB and image is L the result will be RGB.
- //paint == RGB && image == RGB: RGB*RGB
- //paint == RGB && image == L : RGB*LLL
- //paint == L && image == RGB: LLL*RGB
- //paint == L && image == L : L*L
- RI_ASSERT(m_surfaceToPaintMatrix.isAffine());
- if(!s.isLuminance() && im.isLuminance())
- im.convert((Color::InternalFormat)(im.getInternalFormat() & ~Color::LUMINANCE));
- im.r *= s.r;
- im.g *= s.g;
- im.b *= s.b;
- im.a *= s.a;
- s = im; //use image color space
- colorTransform(s);
- ar = s.a;
- ag = s.a;
- ab = s.a;
- s.convert(dstFormat); //convert resulting color to destination color space
- break;
- default:
- //the result will be in paint color space.
- //dst == RGB && image == RGB: RGB*RGB
- //dst == RGB && image == L : RGB*LLL
- //dst == L && image == RGB: L*(0.2126 R + 0.7152 G + 0.0722 B)
- //dst == L && image == L : L*L
- RI_ASSERT(m_imageMode == VG_DRAW_IMAGE_STENCIL);
- if(dstFormat & Color::LUMINANCE && !im.isLuminance())
- {
- im.r = im.g = im.b = RI_MIN(0.2126f*im.r + 0.7152f*im.g + 0.0722f*im.b, im.a);
- }
- RI_ASSERT(m_surfaceToPaintMatrix.isAffine());
- //s and im are both in premultiplied format. Each image channel acts as an alpha channel.
- colorTransform(s);
- s.convert(dstFormat); //convert paint color to destination space already here, since convert cannot deal with per channel alphas used in this mode.
- //compute per channel alphas
- ar = s.a * im.r;
- ag = s.a * im.g;
- ab = s.a * im.b;
- //premultiply each channel by per channel alphas from the image
- s.r *= im.r;
- s.g *= im.g;
- s.b *= im.b;
- s.a *= im.a;
- //in nonpremultiplied form the result is
- // s.rgb = paint.a * paint.rgb * image.a * image.rgb
- // s.a = paint.a * image.a
- // argb = paint.a * image.a * image.rgb
- break;
- }
- }
- else
- { //paint only
- colorTransform(s);
- ar = s.a;
- ag = s.a;
- ab = s.a;
- s.convert(dstFormat); //convert paint color to destination color space
- }
- RI_ASSERT(s.getInternalFormat() == Color::lRGBA_PRE || s.getInternalFormat() == Color::sRGBA_PRE || s.getInternalFormat() == Color::lLA_PRE || s.getInternalFormat() == Color::sLA_PRE);
- s.assertConsistency();
-
- Surface* colorBuffer = m_drawable->getColorBuffer();
- Surface* maskBuffer = m_drawable->getMaskBuffer();
- RI_ASSERT(colorBuffer);
-
- if(m_drawable->getNumSamples() == 1)
- { //coverage-based antialiasing
- RIfloat cov = coverage;
- if(m_masking && maskBuffer)
- {
- cov *= maskBuffer->readMaskCoverage(x, y);
- if(cov == 0.0f)
- return;
- }
-
- //read destination color
- Color d = colorBuffer->readSample(x, y, 0);
- d.premultiply();
- RI_ASSERT(dstFormat == Color::lRGBA_PRE || dstFormat == Color::sRGBA_PRE || dstFormat == Color::lLA_PRE || dstFormat == Color::sLA_PRE);
-
- //blend
- Color r = blend(s, ar, ag, ab, d, m_blendMode);
-
- //apply antialiasing in linear color space
- Color::InternalFormat aaFormat = (dstFormat & Color::LUMINANCE) ? Color::lLA_PRE : Color::lRGBA_PRE;
- r.convert(aaFormat);
- d.convert(aaFormat);
- r = r * cov + d * (1.0f - cov);
-
- //write result to the destination surface
- r.convert(colorBuffer->getDescriptor().internalFormat);
- colorBuffer->writeSample(x, y, 0, r);
- }
- else
- { //multisampling FSAA
- if(m_masking && maskBuffer)
- {
- sampleMask &= maskBuffer->readMaskMSAA(x, y);
- if(!sampleMask)
- return;
- }
-
- {
- for(int i=0;i<m_drawable->getNumSamples();i++)
- {
- if(sampleMask & (1<<i)) //1-bit coverage
- {
- //read destination color
- Color d = colorBuffer->readSample(x, y, i);
-
- d.premultiply();
- RI_ASSERT(dstFormat == Color::lRGBA_PRE || dstFormat == Color::sRGBA_PRE || dstFormat == Color::lLA_PRE || dstFormat == Color::sLA_PRE);
-
- //blend
- Color r = blend(s, ar, ag, ab, d, m_blendMode);
-
- //write result to the destination surface
- r.convert(colorBuffer->getDescriptor().internalFormat);
- colorBuffer->writeSample(x, y, i, r);
- }
- }
- }
- }
-}
-
-//=======================================================================
-
-} //namespace OpenVGRI