--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hostsupport/hostopenvg/src/riPixelPipe.cpp Wed Oct 06 17:59:01 2010 +0100
@@ -0,0 +1,1440 @@
+/*------------------------------------------------------------------------
+ *
+ * OpenVG 1.1 Reference Implementation
+ * -----------------------------------
+ *
+ * Copyright (c) 2007 The Khronos Group Inc.
+ * Portions copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * 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
+ *//*-------------------------------------------------------------------*/
+
+#ifndef __RIPIXELPIPE_H
+# include "riPixelPipe.h"
+#endif
+#ifndef __RIRASTERIZER_H
+# include "riRasterizer.h"
+#endif
+#ifndef __SFDYNAMICPIXELPIPE_H
+# include "sfDynamicPixelPipe.h"
+#endif
+#ifndef __SFCOMPILER_H
+# include "sfCompiler.h"
+#endif
+
+//==============================================================================================
+
+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),
+ m_lutFormat((VGImageFormat)-1),
+ m_gradientStopsChanged(true)
+{
+ 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);
+ }
+}
+
+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;
+}
+
+void Paint::setGradientStops(Array<GradientStop>& inputStops, Array<GradientStop>& stops)
+{
+ m_colorRampStops.swap(stops);
+ m_inputColorRampStops.swap(inputStops);
+ m_gradientStopsChanged = true;
+}
+
+void Paint::setLinearGradient(const Vector2& p0, const Vector2& p1)
+{
+ m_linearGradientPoint0 = p0;
+ m_linearGradientPoint1 = p1;
+}
+
+void Paint::setRadialGradient(const Vector2& c, const Vector2& f, VGfloat r)
+{
+ m_radialGradientCenter = c;
+ m_radialGradientFocalPoint = f;
+ m_radialGradientRadius = r;
+}
+
+bool Paint::linearDegenerate() const
+{
+ return m_linearGradientPoint0 == m_linearGradientPoint1 ? true : false;
+}
+
+bool Paint::radialDegenerate() const
+{
+ return m_radialGradientRadius == 0.0f ? true : false;
+}
+
+/**
+ * \brief Returns either the VG_PAINT_COLOR, or evaluated gradient value when the
+ * gradient is degenerate.
+ */
+Color Paint::getSolidColor() const
+{
+ if (m_paintType == VG_PAINT_TYPE_PATTERN)
+ {
+ RI_ASSERT(m_pattern == NULL);
+ return m_paintColor;
+ }
+
+ if (m_paintType == VG_PAINT_TYPE_COLOR)
+ return m_paintColor;
+
+ RI_ASSERT(linearDegenerate() || radialDegenerate());
+
+ // Determine the color at the end of the gradient
+ RIfloat gs, ge;
+ if (m_colorRampSpreadMode == VG_COLOR_RAMP_SPREAD_PAD)
+ {
+ gs = 1.0f - 1/256.0f;
+ ge = 1.0f;
+ } else if (m_colorRampSpreadMode == VG_COLOR_RAMP_SPREAD_REPEAT)
+ {
+ gs = 0.0f;
+ ge = 1/256.0f;
+ } else
+ {
+ gs = 1.0f - 1/256.0f;
+ ge = 1.0f;
+ }
+ Color c = integrateColorRamp(gs, ge);
+ return c * 256.0f;
+}
+
+/*-------------------------------------------------------------------*//*!
+* \brief Returns the average color within an offset range in the color ramp.
+* \param
+* \return
+* \note
+*//*-------------------------------------------------------------------*/
+
+Color Paint::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_colorRampStops.size() >= 2); //there are at least two stops
+
+ Color currC(0,0,0,0,m_colorRampPremultiplied ? Color::sRGBA_PRE : Color::sRGBA);
+
+ if(gmin == 1.0f || gmax == 0.0f)
+ return currC;
+
+ int i = 0;
+
+ for(; i < m_colorRampStops.size()-1; i++)
+ {
+ if(gmin >= m_colorRampStops[i].offset && gmin < m_colorRampStops[i+1].offset)
+ {
+ RIfloat s = m_colorRampStops[i].offset;
+ RIfloat e = m_colorRampStops[i+1].offset;
+ RI_ASSERT(s < e);
+ RIfloat g = (gmin - s) / (e - s);
+
+ Color sc = readStopColor(m_colorRampStops, i, m_colorRampPremultiplied);
+ Color ec = readStopColor(m_colorRampStops, i+1, m_colorRampPremultiplied);
+ Color rc = (1.0f-g) * sc + g * ec;
+
+ //subtract the average color from the start of the stop to gmin
+ Color dc = 0.5f*(gmin - s)*(sc + rc);
+ currC -= dc;
+ break;
+ }
+ }
+
+ for(;i < m_colorRampStops.size()-1; i++)
+ {
+ RIfloat s = m_colorRampStops[i].offset;
+ RIfloat e = m_colorRampStops[i+1].offset;
+ RI_ASSERT(s <= e);
+
+ Color sc = readStopColor(m_colorRampStops, i, m_colorRampPremultiplied);
+ Color ec = readStopColor(m_colorRampStops, i+1, m_colorRampPremultiplied);
+
+ //average of the stop
+ Color dc = 0.5f*(e-s)*(sc + ec);
+ currC += dc;
+
+ if(gmax >= m_colorRampStops[i].offset && gmax < 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
+ dc = 0.5f*(e - gmax)*(rc + ec);
+ currC -= dc;
+ break;
+ }
+ }
+
+ return currC;
+}
+
+/**
+ * \brief Generates gradient color-ramp lookup values.
+ *
+ * \param targetFormat Destination or image format to associate LUT with.
+ * \patam drawImage true if paint is evaluated along drawImage.
+ *
+ * \note Must be called prior to rendering, and after the destination
+ * format is known. The destination format is either destination
+ * surface format, or the image format in case of image rendering
+ * operation.
+ */
+void Paint::generateLUT(PixelPipe& pipe, VGImageFormat preferredFormat)
+{
+ const RIfloat gstep = 1.0f / (GRADIENT_LUT_COUNT);
+ const RIfloat rcp = (RIfloat)(GRADIENT_LUT_COUNT);
+ RIfloat gsx;
+ gsx = 0.0f;
+
+ if (!pipe.colorTransformChanged() && !m_gradientStopsChanged && (preferredFormat == m_lutFormat))
+ return; // Already in correct format
+
+ const bool inputPremultiplied = m_colorRampPremultiplied == VG_TRUE ? true : false;
+
+ // Colortransform premultiplies color.
+ const Color::Descriptor srcDesc = Color::formatToDescriptorConst(
+ inputPremultiplied || pipe.hasColorTransform() ? VG_sRGBA_8888_PRE : VG_sRGBA_8888);
+
+ const Color::Descriptor dstDesc = Color::formatToDescriptorConst(preferredFormat);
+
+ // Create a pre-calculated LUT.
+ for (int i = 0; i < GRADIENT_LUT_COUNT; i++)
+ {
+ // \todo Open up the integrator and/or use also integers.
+ Color c = integrateColorRamp(gsx, gsx + gstep);
+ c *= rcp;
+
+ // \todo Changing the mode must be tracked somehow!
+ if (pipe.getImageMode() != VG_DRAW_IMAGE_MULTIPLY)
+ pipe.colorTransform(c);
+
+ IntegerColor ic = IntegerColor(c);
+ ic.convertToFrom(dstDesc, srcDesc, false);
+ m_gradientLUT[i] = ic;
+
+ gsx += gstep;
+ }
+
+ m_gradientStopsChanged = false;
+ m_lutFormat = Color::descriptorToVGImageFormat(dstDesc);
+ pipe.setColorTransformChanged(false);
+
+ RI_ASSERT(m_lutFormat == preferredFormat);
+}
+
+/*-------------------------------------------------------------------*//*!
+* \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_iColorTransformValues(),
+ m_surfaceToPaintMatrix(),
+ m_surfaceToImageMatrix(),
+ m_paintToSurfaceMatrix(),
+ m_maskOperation(VG_SET_MASK),
+ m_renderToMask(false),
+ m_colorTransformChanged(true)
+{
+ for(int i=0;i<8;i++)
+ {
+ m_colorTransformValues[i] = (i < 4) ? 1.0f : 0.0f;
+ m_iColorTransformValues[i] = (i < 4) ? (COLOR_TRANSFORM_ONE) : 0;
+ }
+}
+
+
+/*-------------------------------------------------------------------*//*!
+* \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(Paint* paint)
+{
+ // \temp Only call this right before filling a polygon.
+ 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);
+ m_iColorTransformValues[i] = RI_ROUND_TO_INT(m_colorTransformValues[i]*(RIfloat)COLOR_TRANSFORM_ONE);
+ m_iColorTransformValues[i+4] = RI_ROUND_TO_INT(m_colorTransformValues[i+4]*255.0f);
+ }
+ m_colorTransformChanged = true;
+}
+
+const Image* PixelPipe::getRenderTargetImage() const
+{
+ if (m_renderToMask)
+ return m_drawable->getMaskBuffer()->getImage();
+
+ return m_drawable->getColorBuffer()->getImage();
+}
+
+/**
+ * \brief Determine an appropriate VGImageFormat to use for lookup tables.
+ * \todo Should return descriptor instead?
+ */
+VGImageFormat PixelPipe::getPreferredLUTFormat() const
+{
+ const Image* target = getRenderTargetImage();
+ const Color::Descriptor& targetDesc = target->getDescriptor();
+
+ if (m_renderToMask)
+ {
+ RI_ASSERT(!m_image);
+ if (targetDesc.isNonlinear())
+ return VG_sRGBA_8888_PRE;
+ else
+ return VG_lRGBA_8888_PRE;
+ }
+
+ if (m_image && m_imageMode == VG_DRAW_IMAGE_MULTIPLY)
+ return VG_sRGBA_8888_PRE; // ?
+
+ // Prefer premultiplied formats
+ // \note Can also generate non-premultiplied if no sampling/other operation and destination
+ // is in linear format.
+ // \note Do not use VGImageFormat, because using (s/l)LA88 is possible with
+ // luminance destination formats.
+ if (targetDesc.isNonlinear())
+ return VG_sRGBA_8888_PRE;
+ else
+ return VG_lRGBA_8888_PRE;
+}
+
+void PixelPipe::prepareSolidFill()
+{
+ if (!(m_drawable && m_paint))
+ return;
+
+ Color c = m_paint->getSolidColor();
+ //Color c = m_paint->m_paintColor;
+
+ if (!m_image || m_imageMode != VG_DRAW_IMAGE_MULTIPLY)
+ colorTransform(c); // Output will be premultiplied
+ // Generate internal color
+ Color::Descriptor blendDesc = getRenderTargetImage()->getDescriptor();
+
+ // MULTIPLY uses the color as-is.
+ if (m_imageMode != VG_DRAW_IMAGE_MULTIPLY) c.convert(blendDesc.internalFormat);
+
+ IntegerColor ic = IntegerColor(c);
+ blendDesc.internalFormat = (Color::InternalFormat)(blendDesc.internalFormat | (Color::PREMULTIPLIED));
+
+ if (m_imageMode != VG_DRAW_IMAGE_MULTIPLY) c.convert(blendDesc.internalFormat);
+
+ IntegerColor blendColor = IntegerColor(c);
+
+ if (m_imageMode == VG_DRAW_IMAGE_STENCIL)
+ blendColor.asFixedPoint(c); // Enhance the precision a bit
+
+ // \todo No need to pack the color if solid fill is not possible
+ if (!m_renderToMask)
+ ic.truncateColor(getRenderTargetImage()->getDescriptor());
+ else
+ ic.truncateMask(getRenderTargetImage()->getDescriptor());
+
+ RIuint32 p = ic.getPackedColor(getRenderTargetImage()->getDescriptor());
+
+ m_spanUniforms.solidColor = blendColor; // This must be premultiplied
+ m_spanUniforms.packedSolidColor = p; // This must be exactly the dst color
+}
+
+void PixelPipe::prepareCoverageFill()
+{
+ IntegerColor ic = IntegerColor(255, 255, 255, 255);
+ RIuint32 p = ic.getPackedColor(m_drawable->getMaskBuffer()->getDescriptor());
+
+ m_spanUniforms.solidColor = ic;
+ m_spanUniforms.packedSolidColor = p;
+}
+
+void PixelPipe::prepareLinearGradient()
+{
+ const Matrix3x3& s2p = m_surfaceToPaintMatrix;
+
+ Vector2 zero(0,0);
+ Vector2 p0 = m_paint->m_linearGradientPoint0;
+ Vector2 p1 = m_paint->m_linearGradientPoint1;
+ Vector2 delta = p1 - p0;
+
+ zero = affineTransform(s2p, zero);
+
+ RIfloat d = (delta.x * delta.x) + (delta.y * delta.y);
+ RIfloat gdx = (s2p[0][0] * delta.x + s2p[1][0] * delta.y) / d;
+ RIfloat gdy = (s2p[0][1] * delta.x + s2p[1][1] * delta.y) / d;
+ RIfloat cx = (zero.x-p0.x) * (delta.x);
+ RIfloat cy = (zero.y-p0.y) * (delta.y);
+ RIfloat c = (cx + cy) / d;
+
+ m_spanUniforms.dgdx = RI_FLOAT_TO_FX(gdx, PixelPipe::GRADIENT_BITS);
+ m_spanUniforms.dgdy = RI_FLOAT_TO_FX(gdy, PixelPipe::GRADIENT_BITS);
+ m_spanUniforms.lgc = RI_FLOAT_TO_FX(c + 0.5*(gdx + gdy), PixelPipe::GRADIENT_BITS);
+
+ m_spanUniforms.gradientLookup = m_paint->getGradientLUT();
+}
+
+void PixelPipe::prepareRadialGradient()
+{
+ const Matrix3x3& s2p = m_surfaceToPaintMatrix;
+
+ Vector2 c = m_paint->m_radialGradientCenter;
+ Vector2 f = m_paint->m_radialGradientFocalPoint;
+ RGScalar r = m_paint->m_radialGradientRadius;
+
+ Vector2 zero(0,0);
+ Vector2 pzero = affineTransform(s2p, zero);
+
+ Vector2 fp = f - c;
+
+ RGScalar q = fp.length();
+
+ if (q > r)
+ {
+ const RIfloat scale = 0.99f;
+ fp.normalize();
+ fp *= r * scale;
+ f = fp + c;
+ }
+
+ RGScalar r1sqr = RI_SQR(r);
+ RGScalar d = r1sqr - dot(fp, fp);
+
+ m_spanUniforms.rdxdx = s2p[0][0];
+ m_spanUniforms.rdxdy = s2p[0][1];
+ m_spanUniforms.rdydx = s2p[1][0];
+ m_spanUniforms.rdydy = s2p[1][1];
+
+ m_spanUniforms.rsqrp = r1sqr / RI_SQR(d);
+ m_spanUniforms.rfxp = fp.x / d;
+ m_spanUniforms.rfyp = fp.y / d;
+ m_spanUniforms.rx0 = pzero.x - f.x + 0.5f*(m_spanUniforms.rdxdx + m_spanUniforms.rdxdy);
+ m_spanUniforms.ry0 = pzero.y - f.y + 0.5f*(m_spanUniforms.rdydy + m_spanUniforms.rdydx);
+
+ m_spanUniforms.gradientLookup = m_paint->getGradientLUT();
+}
+
+void PixelPipe::preparePattern()
+{
+ // Patterns only support affine transforms
+ const Matrix3x3& s2p = m_surfaceToPaintMatrix;
+ const RIfloat patternWidth = (RIfloat)m_paint->m_pattern->getWidth();
+ const RIfloat patternHeight = (RIfloat)m_paint->m_pattern->getHeight();
+ const Vector2 zero(0, 0);
+ Vector2 pzero = affineTransform(s2p, zero);
+
+ m_spanUniforms.paint_x0 = RI_ROUND_TO_INT((pzero.x/patternWidth)*(1<<GRADIENT_BITS));
+ m_spanUniforms.paint_y0 = RI_ROUND_TO_INT((pzero.y/patternHeight)*(1<<GRADIENT_BITS));
+ m_spanUniforms.paint_dxdx = RI_ROUND_TO_INT((s2p[0][0]/patternWidth)*(1<<GRADIENT_BITS));
+ m_spanUniforms.paint_dxdy = RI_ROUND_TO_INT((s2p[0][1]/patternHeight)*(1<<GRADIENT_BITS));
+ m_spanUniforms.paint_dydx = RI_ROUND_TO_INT((s2p[1][0]/patternWidth)*(1<<GRADIENT_BITS));
+ m_spanUniforms.paint_dydy = RI_ROUND_TO_INT((s2p[1][1]/patternHeight)*(1<<GRADIENT_BITS));
+
+ m_spanUniforms.paint_x0 += (m_spanUniforms.paint_dxdx + m_spanUniforms.paint_dxdy) / 2;
+ m_spanUniforms.paint_y0 += (m_spanUniforms.paint_dydy + m_spanUniforms.paint_dydx) / 2;
+
+ m_spanUniforms.patternPtr = m_paint->m_pattern->getData();
+ m_spanUniforms.patternStride = m_paint->m_pattern->getStride();
+ m_spanUniforms.paint_width = m_paint->m_pattern->getWidth();
+ m_spanUniforms.paint_height = m_paint->m_pattern->getHeight();
+
+ m_signatureState.patternDesc = m_paint->m_pattern->getDescriptor();
+
+ m_spanUniforms.tileFillColor = IntegerColor(m_tileFillColor);
+ // The tile fill-color must be shifted down to same bit-depth (see integer samplers)
+ m_spanUniforms.tileFillColor.truncateColor(m_signatureState.patternDesc);
+
+}
+
+RI_INLINE static RIfloat floatEqu(RIfloat a, RIfloat b, RIfloat e)
+{
+ // \note This should be sufficient for our use-cases;
+ return (RI_ABS(a - b) < e);
+}
+
+RI_INLINE static RIfloat distToInt(RIfloat f)
+{
+ const RIfloat intF = RI_ROUND_TO_INT(f);
+ return RI_ABS(intF - f);
+}
+
+/**
+ * \brief Check if transform is 90 degree rotation, or flip and nothing else.
+ */
+RI_INLINE static bool orthoNormalCoAxialTransform(const Matrix3x3& t, bool aa)
+{
+ const RIfloat epsilonCoord = 1/255.0f; // 1/127.0f;
+ const RIfloat epsilonGradient = epsilonCoord * epsilonCoord; // \todo Too strict?
+ const RIfloat absPatterns[2][4] = {
+ {1.0f, 0.0f, 0.0f, 1.0f},
+ {0.0f, 1.0f, 1.0f, 0.0f} };
+
+ if (!t.isAffine())
+ return false;
+
+ // \todo This rule only applies if filtering is in use?
+ if (aa)
+ if (!floatEqu(distToInt(t[0][2]), 0.0f, epsilonCoord) || !floatEqu(distToInt(t[1][2]), 0.0f, epsilonCoord))
+ return false;
+
+ Matrix3x3 u = t;
+
+ for (int j = 0; j < 2; j++)
+ for (int i = 0; i < 2; i++)
+ u[j][i] = RI_ABS(u[j][i]);
+
+ bool found;
+
+ for (int m = 0; m < 2; m++)
+ {
+ found = true;
+ for (int j = 0; j < 2; j++)
+ {
+ for (int i = 0; i < 2; i++)
+ {
+ //if (u[j][i] != absPatterns[m][i+j*2])
+ if (!floatEqu(u[j][i], absPatterns[m][i+j*2], epsilonGradient))
+ {
+ found = false;
+ break;
+ }
+ }
+ if (!found) break;
+ }
+ if (found) break;
+ }
+
+ return found;
+}
+
+void PixelPipe::prepareImage(bool aa)
+{
+ if (!m_image)
+ {
+ m_signatureState.imageGradientType = GRADIENT_TYPE_INTEGER;
+ return;
+ }
+
+ RI_ASSERT(m_image);
+ m_spanUniforms.imagePtr = m_image->getData();
+ m_spanUniforms.imageStride = m_image->getStride();
+
+ if (m_image->getParent() != NULL)
+ {
+ // Adjust the pointer.
+ int x, y;
+ m_image->getStorageOffset(x, y);
+ m_spanUniforms.imagePtr = Image::calculateAddress(
+ m_spanUniforms.imagePtr, m_image->getDescriptor().bitsPerPixel, x, y, m_spanUniforms.imageStride);
+ }
+
+ // \todo This function writes to derived state also.
+ // \todo Plenty of fast-paths possible!
+ const Matrix3x3& s2i = m_surfaceToImageMatrix;
+
+ Vector3 zero(0,0,1);
+ Vector3 pzero;
+
+ bool fastImage = orthoNormalCoAxialTransform(s2i, aa);
+
+ pzero = s2i * zero;
+
+ if (fastImage)
+ {
+ RI_ASSERT(pzero.z == 1.0f);
+ m_spanUniforms.image_idxdx = RI_ROUND_TO_INT(s2i[0][0]);
+ m_spanUniforms.image_idxdy = RI_ROUND_TO_INT(s2i[0][1]);
+ m_spanUniforms.image_idydx = RI_ROUND_TO_INT(s2i[1][0]);
+ m_spanUniforms.image_idydy = RI_ROUND_TO_INT(s2i[1][1]);
+ m_spanUniforms.image_ix0 = RI_FLOOR(pzero.x + 0.5f*(s2i[0][0]+s2i[0][1]));
+ m_spanUniforms.image_iy0 = RI_FLOOR(pzero.y + 0.5f*(s2i[1][1]+s2i[1][0]));
+
+ // Adjust sample-center when using (exactly) integer coordinates.
+
+#if 0
+ if (m_spanUniforms.image_idxdx < 0 || m_spanUniforms.image_idxdy < 0)
+ m_spanUniforms.image_ix0--;
+
+ if (m_spanUniforms.image_idydy < 0 || m_spanUniforms.image_idydx < 0)
+ m_spanUniforms.image_iy0--;
+#endif
+
+ m_signatureState.imageGradientType = GRADIENT_TYPE_INTEGER;
+ }
+ else if (s2i.isAffine())
+ {
+ RI_ASSERT(pzero.z == 1.0f);
+ const RIfloat imageWidth = m_image->getWidth();
+ const RIfloat imageHeight = m_image->getHeight();
+
+ m_spanUniforms.image_idxdx = RI_ROUND_TO_INT((s2i[0][0]/imageWidth)*(1<<GRADIENT_BITS));
+ m_spanUniforms.image_idxdy = RI_ROUND_TO_INT((s2i[0][1]/imageHeight)*(1<<GRADIENT_BITS));
+ m_spanUniforms.image_idydx = RI_ROUND_TO_INT((s2i[1][0]/imageWidth)*(1<<GRADIENT_BITS));
+ m_spanUniforms.image_idydy = RI_ROUND_TO_INT((s2i[1][1]/imageHeight)*(1<<GRADIENT_BITS));
+ m_spanUniforms.image_ix0 = RI_ROUND_TO_INT((pzero.x/imageWidth)*(1<<GRADIENT_BITS));
+ m_spanUniforms.image_iy0 = RI_ROUND_TO_INT((pzero.y/imageHeight)*(1<<GRADIENT_BITS));
+
+ m_spanUniforms.image_ix0 += (m_spanUniforms.image_idxdx + m_spanUniforms.image_idxdy)/2;
+ m_spanUniforms.image_iy0 += (m_spanUniforms.image_idydy + m_spanUniforms.image_idydx)/2;
+
+ m_spanUniforms.image_iWidth = (RIint32)imageWidth;
+ m_spanUniforms.image_iHeight = (RIint32)imageHeight;
+
+ m_signatureState.imageGradientType = GRADIENT_TYPE_FIXED;
+ }
+ else
+ {
+ // Use floats.
+ m_spanUniforms.image_fx0 = pzero.x;
+ m_spanUniforms.image_fy0 = pzero.y;
+ m_spanUniforms.image_fw0 = pzero.z;
+ m_spanUniforms.image_fdxdx = s2i[0][0];
+ m_spanUniforms.image_fdxdy = s2i[0][1];
+ m_spanUniforms.image_fdydx = s2i[1][0];
+ m_spanUniforms.image_fdydy = s2i[1][1];
+ m_spanUniforms.image_fdwdx = s2i[2][0];
+ m_spanUniforms.image_fdwdy = s2i[2][1];
+
+ m_spanUniforms.image_fx0 += 0.5f * (m_spanUniforms.image_fdxdx + m_spanUniforms.image_fdxdy);
+ m_spanUniforms.image_fy0 += 0.5f * (m_spanUniforms.image_fdydy + m_spanUniforms.image_fdydx);
+ m_spanUniforms.image_fw0 += 0.5f * (m_spanUniforms.image_fdwdx + m_spanUniforms.image_fdwdy);
+
+ m_spanUniforms.image_fWidth = (RIfloat)m_image->getWidth();
+ m_spanUniforms.image_fHeight = (RIfloat)m_image->getHeight();
+
+ m_signatureState.imageGradientType = GRADIENT_TYPE_FLOAT;
+ }
+
+ m_signatureState.imageDesc = m_image->getDescriptor();
+}
+
+static PixelPipe::TilingMode tilingModeOfImageTilingMode(VGTilingMode it)
+{
+ switch(it)
+ {
+ case VG_TILE_PAD:
+ return PixelPipe::TILING_MODE_PAD;
+ case VG_TILE_REPEAT:
+ return PixelPipe::TILING_MODE_REPEAT;
+ case VG_TILE_REFLECT:
+ return PixelPipe::TILING_MODE_REFLECT;
+ default:
+ RI_ASSERT(it == VG_TILE_FILL);
+ return PixelPipe::TILING_MODE_FILL;
+ }
+}
+
+static PixelPipe::TilingMode tilingModeOfSpreadMode(VGColorRampSpreadMode sm)
+{
+ switch(sm)
+ {
+ case VG_COLOR_RAMP_SPREAD_PAD:
+ return PixelPipe::TILING_MODE_PAD;
+ case VG_COLOR_RAMP_SPREAD_REPEAT:
+ return PixelPipe::TILING_MODE_REPEAT;
+ default:
+ RI_ASSERT(sm == VG_COLOR_RAMP_SPREAD_REFLECT);
+ return PixelPipe::TILING_MODE_REFLECT;
+ }
+}
+
+static PixelPipe::TilingMode tilingModeOfPaint(const Paint* paint)
+{
+ switch(paint->m_paintType)
+ {
+ case VG_PAINT_TYPE_COLOR:
+ return PixelPipe::TILING_MODE_PAD;
+ case VG_PAINT_TYPE_LINEAR_GRADIENT:
+ case VG_PAINT_TYPE_RADIAL_GRADIENT:
+ return tilingModeOfSpreadMode(paint->m_colorRampSpreadMode);
+ default:
+ RI_ASSERT(paint->m_paintType == VG_PAINT_TYPE_PATTERN);
+ return tilingModeOfImageTilingMode(paint->m_patternTilingMode);
+ }
+}
+
+void PixelPipe::prepareRenderToMask()
+{
+ RI_ASSERT(m_drawable->getMaskBuffer());
+
+ m_signatureState.dstDesc = m_drawable->getMaskBuffer()->getDescriptor();
+ //RI_ASSERT(m_signatureState.dstFormat >= 0 && m_signatureState.dstFormat <= VG_lABGR_8888_PRE);
+
+ m_signatureState.maskOperation = m_maskOperation;
+}
+
+void PixelPipe::prepareSignatureState()
+{
+ m_signatureState.isRenderToMask = m_renderToMask;
+
+ if (m_signatureState.isRenderToMask)
+ {
+ prepareRenderToMask();
+ return;
+ }
+
+ m_signatureState.blendMode = getBlendMode();
+
+ m_signatureState.hasColorTransform = this->m_colorTransform;
+
+ m_signatureState.paintType = getPaintType();
+
+ m_signatureState.paintTilingMode = tilingModeOfPaint(m_paint);
+ // \todo Derive these from the quality settings somehow.
+ // Linear and nearest should work atm.
+ m_signatureState.paintSampler = SAMPLER_TYPE_NEAREST;
+ m_signatureState.imageSampler = SAMPLER_TYPE_NEAREST;
+
+ m_signatureState.hasMasking = isMasking() && (m_drawable->getMaskBuffer() != NULL);
+
+ m_signatureState.hasImage = m_image ? true : false;
+ m_signatureState.unsafeImageInput = !m_image ? false : m_image->isUnsafe();
+ m_signatureState.imageMode = m_imageMode;
+
+ // Formats. Note that fields that are not filled in / used get set to a derived state in a
+ // separate function!
+
+ if (m_signatureState.paintType == (RIuint32)VG_PAINT_TYPE_COLOR)
+ {
+ RI_ASSERT(m_paint);
+ if (m_paint->getSolidColor().a == 1.0)
+ m_signatureState.fillColorTransparent = false;
+ else
+ m_signatureState.fillColorTransparent = true;
+ }
+
+ m_signatureState.dstDesc = m_drawable->getColorBuffer()->getDescriptor();
+
+ // \todo Why isn't the imagedescriptor set here?
+ if (m_signatureState.hasMasking)
+ {
+ m_signatureState.maskDesc = m_drawable->getMaskBuffer()->getDescriptor();
+ }
+
+}
+
+/**
+ * \brief Remove redundancy from the pixel-pipeline state so that less
+ * pipelines are generated.
+ */
+static void determineDerivedState(PixelPipe::SignatureState& derivedState, const PixelPipe::SignatureState& originalState)
+{
+ derivedState = originalState;
+
+ if (derivedState.isRenderToMask)
+ {
+ // Set a lot of defaults:
+ derivedState.blendMode = VG_BLEND_SRC;
+ derivedState.imageMode = VG_DRAW_IMAGE_NORMAL;
+ derivedState.paintType = VG_PAINT_TYPE_COLOR;
+
+ derivedState.hasImage = false;
+ derivedState.hasMasking = false;
+ derivedState.hasColorTransform = false;
+ }
+
+ if (derivedState.paintType == VG_PAINT_TYPE_COLOR)
+ {
+ derivedState.paintTilingMode = PixelPipe::TILING_MODE_PAD;
+ derivedState.paintSampler = PixelPipe::SAMPLER_TYPE_NEAREST;
+ // \todo Opaque solid colors can benefit from simpler coverage-blending
+ // becase SRC_OVER == SRC. This information has to be present in
+ // the derivedState (and not just uniform).
+ }
+
+ if (!derivedState.hasImage)
+ {
+ derivedState.imageMode = VG_DRAW_IMAGE_NORMAL;
+ derivedState.imageSampler = PixelPipe::SAMPLER_TYPE_NEAREST;
+ derivedState.imageGradientType = PixelPipe::GRADIENT_TYPE_INTEGER;
+ derivedState.imageDesc = Color::Descriptor::getDummyDescriptor();
+ } else if (derivedState.imageMode == VG_DRAW_IMAGE_NORMAL)
+ {
+ // If paint is not generated, use a common enum
+ derivedState.paintType = VG_PAINT_TYPE_COLOR;
+ }
+
+ if (derivedState.paintType != VG_PAINT_TYPE_PATTERN)
+ {
+ derivedState.patternDesc = Color::Descriptor::getDummyDescriptor();
+ }
+
+ if (!derivedState.isRenderToMask)
+ derivedState.maskOperation = VG_CLEAR_MASK;
+
+ if (!derivedState.hasMasking)
+ {
+ derivedState.maskDesc = Color::Descriptor::getDummyDescriptor();
+ }
+}
+
+
+/**
+ * \brief Determine per-scanconversion constant state.
+ * \todo NOTE! This also prepares the derived state at the moment.
+ */
+void PixelPipe::prepareSpanUniforms(bool aa)
+{
+ prepareSignatureState();
+
+ if (m_signatureState.hasColorTransform)
+ m_spanUniforms.colorTransformValues = m_iColorTransformValues;
+
+ RI_ASSERT(m_drawable->getColorBuffer());
+
+ const Image* dst;
+
+ if (!m_signatureState.isRenderToMask)
+ dst = m_drawable->getColorBuffer()->getImage();
+ else
+ dst = m_drawable->getMaskBuffer()->getImage();
+
+ m_spanUniforms.dstPtr = dst->getData();
+ m_spanUniforms.dstStride = dst->getStride();
+
+ if (m_drawable->getMaskBuffer())
+ {
+ m_spanUniforms.maskPtr = m_drawable->getMaskBuffer()->m_image->getData();
+ m_spanUniforms.maskStride = m_drawable->getMaskBuffer()->m_image->getStride();
+ }
+ else
+ {
+ m_spanUniforms.maskPtr = NULL;
+ m_spanUniforms.maskStride = 0;
+ }
+
+ if (!m_renderToMask)
+ {
+ VGImageFormat prefPaintFormat = getPreferredLUTFormat();
+
+ switch (getPaintType())
+ {
+ case VG_PAINT_TYPE_COLOR:
+ prepareSolidFill();
+ break;
+ case VG_PAINT_TYPE_LINEAR_GRADIENT:
+ m_paint->generateLUT(*this, prefPaintFormat);
+ prepareLinearGradient();
+ break;
+ case VG_PAINT_TYPE_RADIAL_GRADIENT:
+ m_paint->generateLUT(*this, prefPaintFormat);
+ prepareRadialGradient();
+ break;
+ default:
+ RI_ASSERT(getPaintType() == VG_PAINT_TYPE_PATTERN);
+ preparePattern();
+ break;
+ }
+ }
+ else
+ {
+ prepareCoverageFill();
+ }
+
+ prepareImage(aa);
+
+ // Must be done last:
+ determineDerivedState(m_derivedState, m_signatureState);
+}
+
+
+/*-------------------------------------------------------------------*//*!
+* \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 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 += m_paint->integrateColorRamp(gmin, gmax);
+ c *= 1.0f/rho;
+ c.clamp(); //clamp needed due to numerical inaccuracies
+ return c;
+ }
+
+ case VG_COLOR_RAMP_SPREAD_REFLECT:
+ {
+ avg = m_paint->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 -= m_paint->integrateColorRamp(RI_CLAMP(1.0f - (gmin - gmini), 0.0f, 1.0f), 1.0f);
+ else
+ c -= m_paint->integrateColorRamp(0.0f, RI_CLAMP(gmin - gmini, 0.0f, 1.0f));
+
+ //subtract end
+ if(((int)gmaxi) & 1)
+ c -= m_paint->integrateColorRamp(0.0f, RI_CLAMP(1.0f - (gmax - gmaxi), 0.0f, 1.0f));
+ else
+ c -= m_paint->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 = m_paint->integrateColorRamp(0.0f, 1.0f);
+ RIfloat gmini = (RIfloat)floor(gmin);
+ RIfloat gmaxi = (RIfloat)floor(gmax);
+ c = (gmaxi + 1.0f - gmini) * avg; //full ramps
+ c -= m_paint->integrateColorRamp(0.0f, RI_CLAMP(gmin - gmini, 0.0f, 1.0f)); //subtract beginning
+ c -= m_paint->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();
+ }
+}
+
+void PixelPipe::fillSpans(PPVariants& variants, const Span* spans, int nSpans) const
+{
+#if 1
+ PPCompiler& compiler = PPCompiler::getCompiler();
+
+ PPCompiler::PixelPipeHandle handle = compiler.compilePixelPipeline(m_derivedState);
+ if (handle)
+ {
+ PixelPipeFunction func = compiler.getPixelPipePtr(handle);
+ RI_ASSERT(func);
+ func(m_spanUniforms, variants, spans, nSpans);
+ compiler.releasePixelPipeline(handle);
+ } else
+#endif
+ {
+ executePixelPipeline(m_derivedState, m_spanUniforms, variants, spans, nSpans);
+ }
+}
+
+//=======================================================================
+
+} //namespace OpenVGRI
+