forked from KolibriOS/kolibrios
44d189b67c
git-svn-id: svn://kolibrios.org@3959 a494cfbc-eb01-0410-851d-a64ba20cac60
280 lines
7.8 KiB
C
280 lines
7.8 KiB
C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2009 Adrian Johnson
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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 either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Adrian Johnson.
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*
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* Contributor(s):
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* Adrian Johnson <ajohnson@redneon.com>
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*/
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#include "cairoint.h"
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#if CAIRO_HAS_PDF_OPERATORS
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#include "cairo-pdf-shading-private.h"
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#include "cairo-array-private.h"
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#include "cairo-error-private.h"
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#include <float.h>
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static unsigned char *
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encode_coordinate (unsigned char *p, double c)
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{
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uint32_t f;
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f = c;
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*p++ = f >> 24;
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*p++ = (f >> 16) & 0xff;
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*p++ = (f >> 8) & 0xff;
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*p++ = f & 0xff;
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return p;
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}
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static unsigned char *
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encode_point (unsigned char *p, const cairo_point_double_t *point)
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{
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p = encode_coordinate (p, point->x);
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p = encode_coordinate (p, point->y);
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return p;
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}
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static unsigned char *
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encode_color_component (unsigned char *p, double color)
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{
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uint16_t c;
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c = _cairo_color_double_to_short (color);
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*p++ = c >> 8;
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*p++ = c & 0xff;
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return p;
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}
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static unsigned char *
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encode_color (unsigned char *p, const cairo_color_t *color)
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{
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p = encode_color_component (p, color->red);
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p = encode_color_component (p, color->green);
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p = encode_color_component (p, color->blue);
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return p;
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}
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static unsigned char *
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encode_alpha (unsigned char *p, const cairo_color_t *color)
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{
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p = encode_color_component (p, color->alpha);
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return p;
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}
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static cairo_status_t
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_cairo_pdf_shading_generate_decode_array (cairo_pdf_shading_t *shading,
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const cairo_mesh_pattern_t *mesh,
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cairo_bool_t is_alpha)
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{
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unsigned int num_color_components, i;
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cairo_bool_t is_valid;
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if (is_alpha)
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num_color_components = 1;
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else
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num_color_components = 3;
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shading->decode_array_length = 4 + num_color_components * 2;
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shading->decode_array = _cairo_malloc_ab (shading->decode_array_length,
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sizeof (double));
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if (unlikely (shading->decode_array == NULL))
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return _cairo_error (CAIRO_STATUS_NO_MEMORY);
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is_valid = _cairo_mesh_pattern_coord_box (mesh,
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&shading->decode_array[0],
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&shading->decode_array[2],
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&shading->decode_array[1],
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&shading->decode_array[3]);
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assert (is_valid);
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assert (shading->decode_array[1] - shading->decode_array[0] >= DBL_EPSILON);
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assert (shading->decode_array[3] - shading->decode_array[2] >= DBL_EPSILON);
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for (i = 0; i < num_color_components; i++) {
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shading->decode_array[4 + 2*i] = 0;
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shading->decode_array[5 + 2*i] = 1;
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}
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return CAIRO_STATUS_SUCCESS;
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}
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/* The ISO32000 specification mandates this order for the points which
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* define the patch. */
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static const int pdf_points_order_i[16] = {
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0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2 };
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static const int pdf_points_order_j[16] = {
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0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 0, 1, 2, 2, 1 };
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static cairo_status_t
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_cairo_pdf_shading_generate_data (cairo_pdf_shading_t *shading,
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const cairo_mesh_pattern_t *mesh,
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cairo_bool_t is_alpha)
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{
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const cairo_mesh_patch_t *patch;
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double x_off, y_off, x_scale, y_scale;
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unsigned int num_patches;
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unsigned int num_color_components;
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unsigned char *p;
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unsigned int i, j;
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if (is_alpha)
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num_color_components = 1;
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else
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num_color_components = 3;
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num_patches = _cairo_array_num_elements (&mesh->patches);
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patch = _cairo_array_index_const (&mesh->patches, 0);
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/* Each patch requires:
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*
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* 1 flag - 1 byte
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* 16 points. Each point is 2 coordinates. Each coordinate is
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* stored in 4 bytes.
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*
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* 4 colors. Each color is stored in 2 bytes * num_color_components.
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*/
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shading->data_length = num_patches * (1 + 16 * 2 * 4 + 4 * 2 * num_color_components);
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shading->data = malloc (shading->data_length);
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if (unlikely (shading->data == NULL))
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return _cairo_error (CAIRO_STATUS_NO_MEMORY);
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x_off = shading->decode_array[0];
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y_off = shading->decode_array[2];
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x_scale = UINT32_MAX / (shading->decode_array[1] - x_off);
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y_scale = UINT32_MAX / (shading->decode_array[3] - y_off);
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p = shading->data;
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for (i = 0; i < num_patches; i++) {
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/* edge flag */
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*p++ = 0;
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/* 16 points */
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for (j = 0; j < 16; j++) {
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cairo_point_double_t point;
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int pi, pj;
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pi = pdf_points_order_i[j];
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pj = pdf_points_order_j[j];
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point = patch[i].points[pi][pj];
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/* Transform the point as specified in the decode array */
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point.x -= x_off;
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point.y -= y_off;
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point.x *= x_scale;
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point.y *= y_scale;
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/* Make sure that rounding errors don't cause
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* wraparounds */
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point.x = _cairo_restrict_value (point.x, 0, UINT32_MAX);
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point.y = _cairo_restrict_value (point.y, 0, UINT32_MAX);
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p = encode_point (p, &point);
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}
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/* 4 colors */
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for (j = 0; j < 4; j++) {
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if (is_alpha)
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p = encode_alpha (p, &patch[i].colors[j]);
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else
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p = encode_color (p, &patch[i].colors[j]);
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}
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}
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assert (p == shading->data + shading->data_length);
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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_cairo_pdf_shading_init (cairo_pdf_shading_t *shading,
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const cairo_mesh_pattern_t *mesh,
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cairo_bool_t is_alpha)
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{
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cairo_status_t status;
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assert (mesh->base.status == CAIRO_STATUS_SUCCESS);
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assert (mesh->current_patch == NULL);
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shading->shading_type = 7;
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/*
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* Coordinates from the minimum to the maximum value of the mesh
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* map to the [0..UINT32_MAX] range and are represented as
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* uint32_t values.
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*
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* Color components are represented as uint16_t (in a 0.16 fixed
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* point format, as in the rest of cairo).
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*/
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shading->bits_per_coordinate = 32;
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shading->bits_per_component = 16;
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shading->bits_per_flag = 8;
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shading->decode_array = NULL;
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shading->data = NULL;
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status = _cairo_pdf_shading_generate_decode_array (shading, mesh, is_alpha);
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if (unlikely (status))
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return status;
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return _cairo_pdf_shading_generate_data (shading, mesh, is_alpha);
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}
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cairo_status_t
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_cairo_pdf_shading_init_color (cairo_pdf_shading_t *shading,
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const cairo_mesh_pattern_t *pattern)
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{
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return _cairo_pdf_shading_init (shading, pattern, FALSE);
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}
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cairo_status_t
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_cairo_pdf_shading_init_alpha (cairo_pdf_shading_t *shading,
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const cairo_mesh_pattern_t *pattern)
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{
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return _cairo_pdf_shading_init (shading, pattern, TRUE);
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}
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void
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_cairo_pdf_shading_fini (cairo_pdf_shading_t *shading)
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{
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free (shading->data);
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free (shading->decode_array);
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}
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#endif /* CAIRO_HAS_PDF_OPERATORS */
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