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authorthb <thb@openoffice.org>2009-10-16 00:43:16 +0200
committerthb <thb@openoffice.org>2009-10-16 00:43:16 +0200
commit1837a267a2cf82b0152631e416d8be66c2adef25 (patch)
treee9df5704754fc1ed559cdc01d7d5c41207af5374 /basegfx/inc/basegfx/tools
parent9b9d44ee50a38180c2451ca527bf7b9f6f46f0fe (diff)
#i105937# Much improved gradient support for canvas/basegfx/drawinglayer.
See http://blog.thebehrens.net/2009/07/28/hackweek-iv-canvas-convwatch/ for more background information
Diffstat (limited to 'basegfx/inc/basegfx/tools')
-rw-r--r--basegfx/inc/basegfx/tools/gradienttools.hxx18
-rw-r--r--basegfx/inc/basegfx/tools/keystoplerp.hxx100
-rw-r--r--basegfx/inc/basegfx/tools/lerp.hxx60
3 files changed, 175 insertions, 3 deletions
diff --git a/basegfx/inc/basegfx/tools/gradienttools.hxx b/basegfx/inc/basegfx/tools/gradienttools.hxx
index 0c7f2ab2c060..dbcc5a3221f0 100644
--- a/basegfx/inc/basegfx/tools/gradienttools.hxx
+++ b/basegfx/inc/basegfx/tools/gradienttools.hxx
@@ -37,6 +37,9 @@
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/numeric/ftools.hxx>
+#include <vector>
+#include <algorithm>
+
namespace basegfx
{
/** Gradient definition as used in ODF 1.2
@@ -78,6 +81,8 @@ namespace basegfx
{
/** Create matrix for ODF's linear gradient definition
+ Note that odf linear gradients are varying in y direction.
+
@param o_rGradientInfo
Receives the calculated texture transformation matrix (for
use with standard [0,1]x[0,1] texture coordinates)
@@ -109,7 +114,7 @@ namespace basegfx
@param rUV
Current uv coordinate. Values outside [0,1] will be
- clamped.
+ clamped. Assumes gradient color varies along the y axis.
@param rGradInfo
Gradient info, for transformation and number of steps
@@ -129,6 +134,14 @@ namespace basegfx
/** Create matrix for ODF's axial gradient definition
+ Note that odf axial gradients are varying in y
+ direction. Note further that you can map the axial
+ gradient to a linear gradient (in case you want or need to
+ avoid an extra gradient renderer), by using
+ createLinearODFGradientInfo() instead, shifting the
+ resulting texture transformation by 0.5 to the top and
+ appending the same stop colors again, but mirrored.
+
@param o_rGradientInfo
Receives the calculated texture transformation matrix (for
use with standard [0,1]x[0,1] texture coordinates)
@@ -160,7 +173,7 @@ namespace basegfx
@param rUV
Current uv coordinate. Values outside [0,1] will be
- clamped.
+ clamped. Assumes gradient color varies along the y axis.
@param rGradInfo
Gradient info, for transformation and number of steps
@@ -394,7 +407,6 @@ namespace basegfx
{
return getSquareGradientAlpha(rUV, rGradInfo); // only matrix setup differs
}
-
}
}
diff --git a/basegfx/inc/basegfx/tools/keystoplerp.hxx b/basegfx/inc/basegfx/tools/keystoplerp.hxx
new file mode 100644
index 000000000000..a54b3485b1a1
--- /dev/null
+++ b/basegfx/inc/basegfx/tools/keystoplerp.hxx
@@ -0,0 +1,100 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: canvastools.hxx,v $
+ * $Revision: 1.10 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _BGFX_TOOLS_KEYSTOPLERP_HXX
+#define _BGFX_TOOLS_KEYSTOPLERP_HXX
+
+#include <basegfx/numeric/ftools.hxx>
+#include <vector>
+
+namespace com{ namespace sun{ namespace star{ namespace uno {
+ template<typename T> class Sequence;
+}}}}
+
+namespace basegfx
+{
+ namespace tools
+ {
+ /** Lerp in a vector of key stops
+
+ This class holds a key stop vector and provides the
+ functionality to lerp inside it. Useful e.g. for
+ multi-stop gradients, or the SMIL key time activity.
+
+ For those, given a global [0,1] lerp alpha, one need to
+ find the suitable bucket index from key stop vector, and
+ then calculate the relative alpha between the two buckets
+ found.
+ */
+ class KeyStopLerp
+ {
+ public:
+ typedef std::pair<std::ptrdiff_t,double> ResultType;
+
+ /** Create lerper with given vector of stops
+
+ @param rKeyStops
+
+ Vector of stops, must contain at least two elements
+ (though preferrably more, otherwise you probably don't
+ need key stop lerping in the first place). All
+ elements must be of monotonically increasing value.
+ */
+ explicit KeyStopLerp( const std::vector<double>& rKeyStops );
+
+ /** Create lerper with given sequence of stops
+
+ @param rKeyStops
+
+ Sequence of stops, must contain at least two elements
+ (though preferrably more, otherwise you probably don't
+ need key stop lerping in the first place). All
+ elements must be of monotonically increasing value.
+ */
+ explicit KeyStopLerp( const ::com::sun::star::uno::Sequence<double>& rKeyStops );
+
+ /** Find two nearest bucket index & interpolate
+
+ @param fAlpha
+ Find bucket index i, with keyStops[i] < fAlpha <=
+ keyStops[i+1]. Return new alpha value in [0,1),
+ proportional to fAlpha's position between keyStops[i]
+ and keyStops[i+1]
+ */
+ ResultType lerp(double fAlpha) const;
+
+ private:
+ std::vector<double> maKeyStops;
+ mutable std::ptrdiff_t mnLastIndex;
+ };
+ }
+}
+
+#endif
diff --git a/basegfx/inc/basegfx/tools/lerp.hxx b/basegfx/inc/basegfx/tools/lerp.hxx
new file mode 100644
index 000000000000..590ef34c2009
--- /dev/null
+++ b/basegfx/inc/basegfx/tools/lerp.hxx
@@ -0,0 +1,60 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: lerp.hxx,v $
+ * $Revision: 1.6 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _BGFX_TOOLS_LERP_HXX
+#define _BGFX_TOOLS_LERP_HXX
+
+#include <sal/types.h>
+
+namespace basegfx
+{
+ namespace tools
+ {
+ /** Generic linear interpolator
+
+ @tpl ValueType
+ Must have operator+ and operator* defined, and should
+ have value semantics.
+
+ @param t
+ As usual, t must be in the [0,1] range
+ */
+ template< typename ValueType > ValueType lerp( const ValueType& rFrom,
+ const ValueType& rTo,
+ double t )
+ {
+ // This is only to suppress a double->int warning. All other
+ // types should be okay here.
+ return static_cast<ValueType>( (1.0-t)*rFrom + t*rTo );
+ }
+ }
+}
+
+#endif /* _BGFX_TOOLS_LERP_HXX */