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775 lines
20 KiB
775 lines
20 KiB
/* This file is part of the KDE project.
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* art_render_misc.c: Here I store some routines I feel should be in libart :)
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*
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* Copyright (C) 2001-2003 KSVG Team
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*
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* This code is adapted from :
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*
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* art_render_gradient.c: Gradient image source for modular rendering.
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*
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* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 2000 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* Authors: Raph Levien <raph@acm.org>
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* Alexander Larsson <alla@lysator.liu.se>
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*/
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#include "config.h"
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#include "art_render_misc.h"
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* These are in KSVGHelper.cpp */
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int linearRGBFromsRGB(int sRGB8bit);
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int sRGBFromLinearRGB(int linearRGB8bit);
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typedef struct _ArtImageSourceGradRad ArtImageSourceGradRad;
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struct _ArtImageSourceGradRad {
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ArtImageSource super;
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const ArtKSVGGradientRadial *gradient;
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double a;
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};
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#define EPSILON 1e-6
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/**
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* art_ksvg_render_gradient_setpix: Set a gradient pixel.
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* @render: The render object.
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* @dst: Pointer to destination (where to store pixel).
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* @n_stops: Number of stops in @stops.
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* @stops: The stops for the gradient.
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* @offset: The offset.
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*
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* @n_stops must be > 0.
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*
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* Sets a gradient pixel, storing it at @dst.
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**/
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static void
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art_ksvg_render_gradient_setpix (ArtRender *render,
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art_u8 *dst,
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int n_stops, ArtGradientStop *stops,
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double offset, ArtKSVGGradientInterpolation interpolation)
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{
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int ix;
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int j;
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double off0, off1;
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int n_ch = render->n_chan + 1;
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for (ix = 0; ix < n_stops; ix++)
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if (stops[ix].offset > offset)
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break;
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/* stops[ix - 1].offset < offset < stops[ix].offset */
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if (ix > 0 && ix < n_stops)
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{
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off0 = stops[ix - 1].offset;
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off1 = stops[ix].offset;
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if (fabs (off1 - off0) > EPSILON)
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{
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double interp;
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interp = (offset - off0) / (off1 - off0);
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if(interpolation == ART_KSVG_LINEARRGB_INTERPOLATION)
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{
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for (j = 0; j < n_ch; j++)
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{
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int z0, z1;
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int z;
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int z0_8bit, z0_linearRGB_8bit;
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int z1_8bit, z1_linearRGB_8bit;
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int z_8bit, z_sRGB_8bit;
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/* Note: Using explicit variables for intermediate steps since */
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/* the ART_PIX macros reference the argument more than once. */
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z0 = stops[ix - 1].color[j];
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z0_8bit = ART_PIX_8_FROM_MAX(z0);
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z0_linearRGB_8bit = linearRGBFromsRGB(z0_8bit);
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z0 = ART_PIX_MAX_FROM_8(z0_linearRGB_8bit);
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z1 = stops[ix].color[j];
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z1_8bit = ART_PIX_8_FROM_MAX(z1);
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z1_linearRGB_8bit = linearRGBFromsRGB(z1_8bit);
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z1 = ART_PIX_MAX_FROM_8(z1_linearRGB_8bit);
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z = floor (z0 + (z1 - z0) * interp + 0.5);
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z_8bit = ART_PIX_8_FROM_MAX(z);
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z_sRGB_8bit = sRGBFromLinearRGB(z_8bit);
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if (render->buf_depth == 8)
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dst[j] = z_sRGB_8bit;
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else /* (render->buf_depth == 16) */
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((art_u16 *)dst)[j] = ART_PIX_MAX_FROM_8(z_sRGB_8bit);
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}
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}
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else
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{
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/* sRGB interpolation */
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for (j = 0; j < n_ch; j++)
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{
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int z0, z1;
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int z;
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z0 = stops[ix - 1].color[j];
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z1 = stops[ix].color[j];
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z = floor (z0 + (z1 - z0) * interp + 0.5);
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if (render->buf_depth == 8)
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dst[j] = ART_PIX_8_FROM_MAX (z);
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else /* (render->buf_depth == 16) */
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((art_u16 *)dst)[j] = z;
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}
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}
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return;
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}
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}
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else if (ix == n_stops)
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ix--;
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for (j = 0; j < n_ch; j++)
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{
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int z;
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z = stops[ix].color[j];
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if (render->buf_depth == 8)
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dst[j] = ART_PIX_8_FROM_MAX (z);
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else /* (render->buf_depth == 16) */
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((art_u16 *)dst)[j] = z;
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}
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}
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static void
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art_ksvg_render_gradient_radial_done (ArtRenderCallback *self, ArtRender *render)
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{
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art_free (self);
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}
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static void
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art_ksvg_render_gradient_radial_render (ArtRenderCallback *self, ArtRender *render,
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art_u8 *dest, int y)
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{
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ArtImageSourceGradRad *z = (ArtImageSourceGradRad *)self;
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const ArtKSVGGradientRadial *gradient = z->gradient;
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int pixstride = (render->n_chan + 1) * (render->depth >> 3);
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int x;
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int x0 = render->x0;
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int width = render->x1 - x0;
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int n_stops = gradient->n_stops;
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ArtGradientStop *stops = gradient->stops;
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art_u8 *bufp = render->image_buf;
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double fx = gradient->fx;
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double fy = gradient->fy;
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double dx, dy;
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double *affine = gradient->affine;
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double aff0 = affine[0];
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double aff1 = affine[1];
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const double a = z->a;
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const double arecip = 1.0 / a;
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double b, db;
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double c, dc, ddc;
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double b_a, db_a;
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double rad, drad, ddrad;
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ArtGradientSpread spread = gradient->spread;
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dx = x0 * aff0 + y * affine[2] + affine[4] - fx;
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dy = x0 * aff1 + y * affine[3] + affine[5] - fy;
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b = dx * fx + dy * fy;
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db = aff0 * fx + aff1 * fy;
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c = dx * dx + dy * dy;
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dc = 2 * aff0 * dx + aff0 * aff0 + 2 * aff1 * dy + aff1 * aff1;
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ddc = 2 * aff0 * aff0 + 2 * aff1 * aff1;
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b_a = b * arecip;
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db_a = db * arecip;
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rad = b_a * b_a + c * arecip;
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drad = 2 * b_a * db_a + db_a * db_a + dc * arecip;
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ddrad = 2 * db_a * db_a + ddc * arecip;
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for (x = 0; x < width; x++)
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{
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double z;
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if (rad > 0)
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z = b_a + sqrt (rad);
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else
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z = b_a;
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if (spread == ART_GRADIENT_REPEAT)
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z = z - floor (z);
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else if (spread == ART_GRADIENT_REFLECT)
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{
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double tmp;
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tmp = z - 2 * floor (0.5 * z);
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z = tmp > 1 ? 2 - tmp : tmp;
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}
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art_ksvg_render_gradient_setpix (render, bufp, n_stops, stops, z, gradient->interpolation);
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bufp += pixstride;
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b_a += db_a;
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rad += drad;
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drad += ddrad;
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}
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}
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static void
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art_ksvg_render_gradient_radial_negotiate (ArtImageSource *self, ArtRender *render,
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ArtImageSourceFlags *p_flags,
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int *p_buf_depth, ArtAlphaType *p_alpha)
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{
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self->super.render = art_ksvg_render_gradient_radial_render;
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*p_flags = 0;
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*p_buf_depth = render->depth;
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*p_alpha = ART_ALPHA_SEPARATE;
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}
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/**
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* art_ksvg_render_gradient_radial: Add a radial gradient image source.
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* @render: The render object.
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* @gradient: The radial gradient.
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*
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* Adds the radial gradient @gradient as the image source for rendering
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* in the render object @render.
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**/
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void
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art_ksvg_render_gradient_radial (ArtRender *render,
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const ArtKSVGGradientRadial *gradient,
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ArtFilterLevel level)
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{
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ArtImageSourceGradRad *image_source = art_new (ArtImageSourceGradRad, 1);
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double fx = gradient->fx;
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double fy = gradient->fy;
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image_source->super.super.render = NULL;
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image_source->super.super.done = art_ksvg_render_gradient_radial_done;
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image_source->super.negotiate = art_ksvg_render_gradient_radial_negotiate;
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image_source->gradient = gradient;
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/* todo: sanitycheck fx, fy? */
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image_source->a = 1 - fx * fx - fy * fy;
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art_render_add_image_source (render, &image_source->super);
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}
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/* Hack to find out how to define alloca on different platforms.
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* Modified version of glib/galloca.h.
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*/
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#ifdef __GNUC__
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/* GCC does the right thing */
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#undef alloca
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#define alloca(size) __builtin_alloca (size)
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#elif defined (HAVE_ALLOCA_H)
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/* a native and working alloca.h is there */
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#include <alloca.h>
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#else /* !__GNUC__ && !HAVE_ALLOCA_H */
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#ifdef _MSC_VER
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#include <malloc.h>
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#define alloca _alloca
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#else /* !_MSC_VER */
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#ifdef _AIX
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#pragma alloca
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#else /* !_AIX */
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#ifndef alloca /* predefined by HP cc +Olibcalls */
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char *alloca ();
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#endif /* !alloca */
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#endif /* !_AIX */
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#endif /* !_MSC_VER */
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#endif /* !__GNUC__ && !HAVE_ALLOCA_H */
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#undef DEBUG_SPEW
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typedef struct _ArtImageSourceGradLin ArtImageSourceGradLin;
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/* The stops will be copied right after this structure */
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struct _ArtImageSourceGradLin
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{
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ArtImageSource super;
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ArtKSVGGradientLinear gradient;
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ArtGradientStop stops[1];
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};
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#ifndef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif /* MAX */
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#ifndef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif /* MIN */
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static void
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art_ksvg_rgba_gradient_run (art_u8 *buf,
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art_u8 *color1,
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art_u8 *color2,
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int len)
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{
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int i;
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int r, g, b, a;
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int dr, dg, db, da;
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#ifdef DEBUG_SPEW
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printf ("gradient run from %3d %3d %3d %3d to %3d %3d %3d %3d in %d pixels\n",
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color1[0], color1[1], color1[2], color1[3],
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color2[0], color2[1], color2[2], color2[3],
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len);
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#endif
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r = (color1[0] << 16) + 0x8000;
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g = (color1[1] << 16) + 0x8000;
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b = (color1[2] << 16) + 0x8000;
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a = (color1[3] << 16) + 0x8000;
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dr = ((color2[0] - color1[0]) << 16) / len;
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dg = ((color2[1] - color1[1]) << 16) / len;
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db = ((color2[2] - color1[2]) << 16) / len;
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da = ((color2[3] - color1[3]) << 16) / len;
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for(i = 0; i < len; i++)
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{
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*buf++ = (r>>16);
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*buf++ = (g>>16);
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*buf++ = (b>>16);
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*buf++ = (a>>16);
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r += dr;
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g += dg;
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b += db;
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a += da;
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}
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}
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static void
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ksvg_calc_color_at (ArtGradientStop *stops,
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int n_stops,
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ArtGradientSpread spread,
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double offset,
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double offset_fraction,
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int favor_start,
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int ix,
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art_u8 *color)
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{
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double off0, off1;
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int j;
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if(spread == ART_GRADIENT_PAD)
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{
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if(offset < EPSILON)
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{
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color[0] = ART_PIX_8_FROM_MAX (stops[0].color[0]);
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color[1] = ART_PIX_8_FROM_MAX (stops[0].color[1]);
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color[2] = ART_PIX_8_FROM_MAX (stops[0].color[2]);
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color[3] = ART_PIX_8_FROM_MAX (stops[0].color[3]);
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return;
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}
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if(offset >= 1.0 - EPSILON)
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{
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color[0] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[0]);
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color[1] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[1]);
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color[2] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[2]);
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color[3] = ART_PIX_8_FROM_MAX (stops[n_stops-1].color[3]);
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return;
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}
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}
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if(ix > 0 && ix < n_stops)
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{
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off0 = stops[ix - 1].offset;
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off1 = stops[ix].offset;
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if(fabs (off1 - off0) > EPSILON)
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{
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double interp;
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double o;
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o = offset_fraction;
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if((fabs (o) < EPSILON) && (!favor_start))
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o = 1.0;
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else if((fabs (o-1.0) < EPSILON) && (favor_start))
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o = 0.0;
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/*
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if (offset_fraction == 0.0 && !favor_start)
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offset_fraction = 1.0;
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*/
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interp = (o - off0) / (off1 - off0);
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for(j = 0; j < 4; j++)
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{
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int z0, z1;
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int z;
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z0 = stops[ix - 1].color[j];
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z1 = stops[ix].color[j];
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z = floor (z0 + (z1 - z0) * interp + 0.5);
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color[j] = ART_PIX_8_FROM_MAX (z);
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}
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return;
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}
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/* If offsets are too close to safely do the division, just
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pick the ix color. */
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color[0] = ART_PIX_8_FROM_MAX (stops[ix].color[0]);
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color[1] = ART_PIX_8_FROM_MAX (stops[ix].color[1]);
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color[2] = ART_PIX_8_FROM_MAX (stops[ix].color[2]);
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color[3] = ART_PIX_8_FROM_MAX (stops[ix].color[3]);
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return;
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}
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/*printf ("WARNING! bad ix %d in calc_color_at() [internal error]\n", ix);
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assert (0);*/
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}
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static void
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art_ksvg_render_gradient_linear_render_8 (ArtRenderCallback *self,
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ArtRender *render,
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art_u8 *dest, int y)
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{
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ArtImageSourceGradLin *z = (ArtImageSourceGradLin *)self;
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const ArtKSVGGradientLinear *gradient = &(z->gradient);
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int i;
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int width = render->x1 - render->x0;
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int len;
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double offset, d_offset;
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double offset_fraction;
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int next_stop;
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int ix;
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art_u8 color1[4], color2[4];
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int n_stops = gradient->n_stops;
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int extra_stops;
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ArtGradientStop *stops = gradient->stops;
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ArtGradientStop *tmp_stops;
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art_u8 *bufp = render->image_buf;
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ArtGradientSpread spread = gradient->spread;
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#ifdef DEBUG_SPEW
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printf ("x1: %d, x2: %d, y: %d\n", render->x0, render->x1, y);
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printf ("spread: %d, stops:", gradient->spread);
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for(i=0;i<n_stops;i++)
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{
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printf ("%f, ", gradient->stops[i].offset);
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}
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printf ("\n");
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printf ("a: %f, b: %f, c: %f\n", gradient->a, gradient->b, gradient->c);
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#endif
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offset = render->x0 * gradient->affine[0] + y * gradient->affine[2] + gradient->affine[4];
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d_offset = gradient->affine[0];
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/* We need to force the gradient to extend the whole 0..1 segment,
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because the rest of the code doesn't handle partial gradients
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correctly */
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if((gradient->stops[0].offset > EPSILON /* == 0.0 */) ||
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(gradient->stops[n_stops-1].offset < (1.0 - EPSILON)))
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{
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extra_stops = 0;
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tmp_stops = stops = alloca (sizeof (ArtGradientStop) * (n_stops + 2));
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if(gradient->stops[0].offset > EPSILON /* 0.0 */)
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{
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memcpy (tmp_stops, gradient->stops, sizeof (ArtGradientStop));
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tmp_stops[0].offset = 0.0;
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tmp_stops += 1;
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extra_stops++;
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}
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memcpy (tmp_stops, gradient->stops, sizeof (ArtGradientStop) * n_stops);
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|
if(gradient->stops[n_stops-1].offset < (1.0 - EPSILON))
|
|
{
|
|
tmp_stops += n_stops;
|
|
memcpy (tmp_stops, &gradient->stops[n_stops-1], sizeof (ArtGradientStop));
|
|
tmp_stops[0].offset = 1.0;
|
|
extra_stops++;
|
|
}
|
|
n_stops += extra_stops;
|
|
|
|
|
|
#ifdef DEBUG_SPEW
|
|
printf ("start/stop modified stops:");
|
|
for(i=0;i<n_stops;i++)
|
|
{
|
|
printf ("%f, ", stops[i].offset);
|
|
}
|
|
printf ("\n");
|
|
#endif
|
|
|
|
}
|
|
|
|
if(spread == ART_GRADIENT_REFLECT)
|
|
{
|
|
tmp_stops = stops;
|
|
stops = alloca (sizeof (ArtGradientStop) * n_stops * 2);
|
|
memcpy (stops, tmp_stops, sizeof (ArtGradientStop) * n_stops);
|
|
|
|
for(i = 0; i< n_stops; i++)
|
|
{
|
|
stops[n_stops * 2 - 1 - i].offset = (1.0 - stops[i].offset / 2.0);
|
|
memcpy (stops[n_stops * 2 - 1 - i].color, stops[i].color, sizeof (stops[i].color));
|
|
stops[i].offset = stops[i].offset / 2.0;
|
|
}
|
|
|
|
spread = ART_GRADIENT_REPEAT;
|
|
offset = offset / 2.0;
|
|
d_offset = d_offset / 2.0;
|
|
|
|
n_stops = 2 * n_stops;
|
|
|
|
#ifdef DEBUG_SPEW
|
|
printf ("reflect modified stops:");
|
|
for(i=0;i<n_stops;i++)
|
|
{
|
|
printf ("%f, ", stops[i].offset);
|
|
}
|
|
printf ("\n");
|
|
#endif
|
|
}
|
|
|
|
offset_fraction = offset - floor (offset);
|
|
#ifdef DEBUG_SPEW
|
|
printf ("inital offset: %f, fraction: %f d_offset: %f\n", offset, offset_fraction, d_offset);
|
|
#endif
|
|
/* ix is selected so that offset_fraction is
|
|
stops[ix-1] <= offset_fraction <= stops[ix]
|
|
If offset_fraction is equal to one of the edges, ix
|
|
is selected so the the section of the line extending
|
|
in the same direction as d_offset is between ix-1 and ix.
|
|
*/
|
|
for(ix = 0; ix < n_stops; ix++)
|
|
if(stops[ix].offset > offset_fraction ||
|
|
(d_offset < 0.0 && fabs (stops[ix].offset - offset_fraction) < EPSILON))
|
|
break;
|
|
if(ix == 0)
|
|
ix = n_stops - 1;
|
|
else if(ix == n_stops)
|
|
ix = n_stops - 1;
|
|
|
|
#ifdef DEBUG_SPEW
|
|
printf ("Initial ix: %d\n", ix);
|
|
#endif
|
|
#if 0
|
|
assert (ix > 0);
|
|
assert (ix < n_stops);
|
|
assert ((stops[ix-1].offset <= offset_fraction + EPSILON) ||
|
|
((stops[ix].offset > (1.0 - EPSILON)) && (offset_fraction < EPSILON /* == 0.0*/)));
|
|
/*assert (offset_fraction <= stops[ix].offset);*/
|
|
/* FIXME: These asserts may be broken, it is for now
|
|
safer to not use them. Should be fixed!
|
|
See bug #121850
|
|
assert ((offset_fraction != stops[ix-1].offset) ||
|
|
(d_offset >= 0.0));
|
|
assert ((offset_fraction != stops[ix].offset) ||
|
|
(d_offset <= 0.0));
|
|
*/
|
|
#endif
|
|
while(width > 0)
|
|
{
|
|
#ifdef DEBUG_SPEW
|
|
printf ("ix: %d\n", ix);
|
|
printf ("start offset: %f\n", offset);
|
|
#endif
|
|
ksvg_calc_color_at (stops, n_stops,
|
|
spread,
|
|
offset,
|
|
offset_fraction,
|
|
(d_offset > -EPSILON),
|
|
ix,
|
|
color1);
|
|
|
|
if(d_offset > 0)
|
|
next_stop = ix;
|
|
else
|
|
next_stop = ix-1;
|
|
|
|
#ifdef DEBUG_SPEW
|
|
printf ("next_stop: %d\n", next_stop);
|
|
#endif
|
|
if(fabs (d_offset) > EPSILON)
|
|
{
|
|
double o;
|
|
o = offset_fraction;
|
|
|
|
if((fabs (o) <= EPSILON) && (ix == n_stops - 1))
|
|
o = 1.0;
|
|
else if((fabs (o-1.0) <= EPSILON) && (ix == 1))
|
|
o = 0.0;
|
|
|
|
#ifdef DEBUG_SPEW
|
|
printf ("o: %f\n", o);
|
|
#endif
|
|
len = (int)floor (fabs ((stops[next_stop].offset - o) / d_offset)) + 1;
|
|
len = MAX (len, 0);
|
|
len = MIN (len, width);
|
|
}
|
|
else
|
|
{
|
|
len = width;
|
|
}
|
|
#ifdef DEBUG_SPEW
|
|
printf ("len: %d\n", len);
|
|
#endif
|
|
if(len > 0)
|
|
{
|
|
offset = offset + (len-1) * d_offset;
|
|
offset_fraction = offset - floor (offset);
|
|
#ifdef DEBUG_SPEW
|
|
printf ("end offset: %f, fraction: %f\n", offset, offset_fraction);
|
|
#endif
|
|
ksvg_calc_color_at (stops, n_stops,
|
|
spread,
|
|
offset,
|
|
offset_fraction,
|
|
(d_offset < EPSILON),
|
|
ix,
|
|
color2);
|
|
|
|
art_ksvg_rgba_gradient_run (bufp,
|
|
color1,
|
|
color2,
|
|
len);
|
|
offset += d_offset;
|
|
offset_fraction = offset - floor (offset);
|
|
}
|
|
|
|
if(d_offset > 0)
|
|
{
|
|
do
|
|
{
|
|
ix++;
|
|
if(ix == n_stops)
|
|
ix = 1;
|
|
/* Note: offset_fraction can actually be one here on x86 machines that
|
|
does calculations with extended precision, but later rounds to 64bit.
|
|
This happens if the 80bit offset_fraction is larger than the
|
|
largest 64bit double that is less than one.
|
|
*/
|
|
}
|
|
while(!((stops[ix-1].offset <= offset_fraction &&
|
|
offset_fraction < stops[ix].offset) ||
|
|
(ix == 1 && offset_fraction > (1.0 - EPSILON))));
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
ix--;
|
|
if(ix == 0)
|
|
ix = n_stops - 1;
|
|
}
|
|
while(!((stops[ix-1].offset < offset_fraction &&
|
|
offset_fraction <= stops[ix].offset) ||
|
|
(ix == n_stops - 1 && offset_fraction < EPSILON /* == 0.0*/)));
|
|
}
|
|
|
|
bufp += 4*len;
|
|
width -= len;
|
|
}
|
|
}
|
|
|
|
static void
|
|
art_ksvg_render_gradient_linear_done (ArtRenderCallback *self, ArtRender *render)
|
|
{
|
|
art_free (self);
|
|
}
|
|
|
|
static void
|
|
art_ksvg_render_gradient_linear_render (ArtRenderCallback *self, ArtRender *render,
|
|
art_u8 *dest, int y)
|
|
{
|
|
ArtImageSourceGradLin *z = (ArtImageSourceGradLin *)self;
|
|
const ArtKSVGGradientLinear *gradient = &(z->gradient);
|
|
int pixstride = (render->n_chan + 1) * (render->depth >> 3);
|
|
int x;
|
|
int width = render->x1 - render->x0;
|
|
double offset, d_offset;
|
|
double actual_offset;
|
|
int n_stops = gradient->n_stops;
|
|
ArtGradientStop *stops = gradient->stops;
|
|
art_u8 *bufp = render->image_buf;
|
|
ArtGradientSpread spread = gradient->spread;
|
|
|
|
offset = render->x0 * gradient->affine[0] + y * gradient->affine[2] + gradient->affine[4];
|
|
d_offset = gradient->affine[0];
|
|
|
|
for(x = 0; x < width; x++)
|
|
{
|
|
if(spread == ART_GRADIENT_PAD)
|
|
actual_offset = offset;
|
|
else if(spread == ART_GRADIENT_REPEAT)
|
|
actual_offset = offset - floor (offset);
|
|
else /* (spread == ART_GRADIENT_REFLECT) */
|
|
{
|
|
double tmp;
|
|
|
|
tmp = offset - 2 * floor (0.5 * offset);
|
|
actual_offset = tmp > 1 ? 2 - tmp : tmp;
|
|
}
|
|
art_ksvg_render_gradient_setpix (render, bufp, n_stops, stops, actual_offset, gradient->interpolation);
|
|
offset += d_offset;
|
|
bufp += pixstride;
|
|
}
|
|
}
|
|
|
|
static void
|
|
art_ksvg_render_gradient_linear_negotiate (ArtImageSource *self, ArtRender *render,
|
|
ArtImageSourceFlags *p_flags,
|
|
int *p_buf_depth, ArtAlphaType *p_alpha)
|
|
{
|
|
ArtImageSourceGradLin *z = (ArtImageSourceGradLin *)self;
|
|
|
|
if(render->depth == 8 &&
|
|
render->n_chan == 3 &&
|
|
z->gradient.interpolation == ART_KSVG_SRGB_INTERPOLATION)
|
|
{
|
|
/* The optimised renderer doesn't support linearRGB interpolation at the moment */
|
|
/* so we only use it for sRGB, which is more common anyway. */
|
|
self->super.render = art_ksvg_render_gradient_linear_render_8;
|
|
*p_flags = 0;
|
|
*p_buf_depth = 8;
|
|
*p_alpha = ART_ALPHA_SEPARATE;
|
|
return;
|
|
}
|
|
|
|
self->super.render = art_ksvg_render_gradient_linear_render;
|
|
*p_flags = 0;
|
|
*p_buf_depth = render->depth;
|
|
*p_alpha = ART_ALPHA_SEPARATE;
|
|
}
|
|
|
|
/**
|
|
* art_render_gradient_linear: Add a linear gradient image source.
|
|
* @render: The render object.
|
|
* @gradient: The linear gradient.
|
|
*
|
|
* Adds the linear gradient @gradient as the image source for rendering
|
|
* in the render object @render.
|
|
**/
|
|
void
|
|
art_ksvg_render_gradient_linear (ArtRender *render,
|
|
const ArtKSVGGradientLinear *gradient,
|
|
ArtFilterLevel level)
|
|
{
|
|
ArtImageSourceGradLin *image_source = art_alloc (sizeof (ArtImageSourceGradLin) +
|
|
sizeof (ArtGradientStop) * (gradient->n_stops - 1));
|
|
|
|
image_source->super.super.render = NULL;
|
|
image_source->super.super.done = art_ksvg_render_gradient_linear_done;
|
|
image_source->super.negotiate = art_ksvg_render_gradient_linear_negotiate;
|
|
|
|
/* copy the gradient into the structure */
|
|
image_source->gradient = *gradient;
|
|
image_source->gradient.stops = image_source->stops;
|
|
memcpy (image_source->gradient.stops, gradient->stops, sizeof (ArtGradientStop) * gradient->n_stops);
|
|
|
|
art_render_add_image_source (render, &image_source->super);
|
|
}
|
|
|