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cairo-qt-surface.cpp
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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2008 Mozilla Corporation
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Mozilla Corporation.
*
* Contributor(s):
* Vladimir Vukicevic <[email protected]>
*/
/* Get INT16_MIN etc. as per C99 */
#define __STDC_LIMIT_MACROS
#include "cairoint.h"
#include "cairo-clip-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-region-private.h"
#include "cairo-surface-clipper-private.h"
#include "cairo-types-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-pattern-private.h"
#include "cairo-surface-backend-private.h"
#include "cairo-ft.h"
#include "cairo-qt.h"
#include <memory>
#include <QtGui/QPainter>
#include <QtGui/QPaintEngine>
#include <QtGui/QPaintDevice>
#include <QtGui/QImage>
#include <QtGui/QPixmap>
#include <QtGui/QBrush>
#include <QtGui/QPen>
#include <QWidget>
#include <QtCore/QVarLengthArray>
#if (QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)) || defined(QT_GLYPHS_API_BACKPORT)
extern void qt_draw_glyphs(QPainter *, const quint32 *glyphs, const QPointF *positions, int count);
#endif
#include <sys/time.h>
/* Enable workaround slow regional Qt paths */
#define ENABLE_FAST_FILL 0
#define ENABLE_FAST_CLIP 0
#if 0
#define D(x) x
static const char *
_opstr (cairo_operator_t op)
{
const char *ops[] = {
"CLEAR",
"SOURCE",
"OVER",
"IN",
"OUT",
"ATOP",
"DEST",
"DEST_OVER",
"DEST_IN",
"DEST_OUT",
"DEST_ATOP",
"XOR",
"ADD",
"SATURATE"
};
if (op < CAIRO_OPERATOR_CLEAR || op > CAIRO_OPERATOR_SATURATE)
return "(\?\?\?)";
return ops[op];
}
#else
#define D(x) do { } while(0)
#endif
#ifndef CAIRO_INT_STATUS_SUCCESS
#define CAIRO_INT_STATUS_SUCCESS ((cairo_int_status_t) CAIRO_STATUS_SUCCESS)
#endif
/* Qt::PenStyle optimization based on the assumption that dots are 1*w and dashes are 3*w. */
#define DOT_LENGTH 1.0
#define DASH_LENGTH 3.0
struct cairo_qt_surface_t {
cairo_surface_t base;
cairo_bool_t supports_porter_duff;
QPainter *p;
/* The pixmap/image constructors will store their objects here */
QPixmap *pixmap;
QImage *image;
QRect window;
cairo_surface_clipper_t clipper;
cairo_surface_t *image_equiv;
};
/* Will be true if we ever try to create a QPixmap and end
* up with one without an alpha channel.
*/
static cairo_bool_t _qpixmaps_have_no_alpha = FALSE;
/*
* Helper methods
*/
static QPainter::CompositionMode
_qpainter_compositionmode_from_cairo_op (cairo_operator_t op)
{
switch (op) {
case CAIRO_OPERATOR_CLEAR:
return QPainter::CompositionMode_Clear;
case CAIRO_OPERATOR_SOURCE:
return QPainter::CompositionMode_Source;
case CAIRO_OPERATOR_OVER:
return QPainter::CompositionMode_SourceOver;
case CAIRO_OPERATOR_IN:
return QPainter::CompositionMode_SourceIn;
case CAIRO_OPERATOR_OUT:
return QPainter::CompositionMode_SourceOut;
case CAIRO_OPERATOR_ATOP:
return QPainter::CompositionMode_SourceAtop;
case CAIRO_OPERATOR_DEST:
return QPainter::CompositionMode_Destination;
case CAIRO_OPERATOR_DEST_OVER:
return QPainter::CompositionMode_DestinationOver;
case CAIRO_OPERATOR_DEST_IN:
return QPainter::CompositionMode_DestinationIn;
case CAIRO_OPERATOR_DEST_OUT:
return QPainter::CompositionMode_DestinationOut;
case CAIRO_OPERATOR_DEST_ATOP:
return QPainter::CompositionMode_DestinationAtop;
case CAIRO_OPERATOR_XOR:
return QPainter::CompositionMode_Xor;
default:
case CAIRO_OPERATOR_ADD:
case CAIRO_OPERATOR_SATURATE:
case CAIRO_OPERATOR_MULTIPLY:
case CAIRO_OPERATOR_SCREEN:
case CAIRO_OPERATOR_OVERLAY:
case CAIRO_OPERATOR_DARKEN:
case CAIRO_OPERATOR_LIGHTEN:
case CAIRO_OPERATOR_COLOR_DODGE:
case CAIRO_OPERATOR_COLOR_BURN:
case CAIRO_OPERATOR_HARD_LIGHT:
case CAIRO_OPERATOR_SOFT_LIGHT:
case CAIRO_OPERATOR_DIFFERENCE:
case CAIRO_OPERATOR_EXCLUSION:
case CAIRO_OPERATOR_HSL_HUE:
case CAIRO_OPERATOR_HSL_SATURATION:
case CAIRO_OPERATOR_HSL_COLOR:
case CAIRO_OPERATOR_HSL_LUMINOSITY:
ASSERT_NOT_REACHED;
}
}
static bool
_op_is_supported (cairo_qt_surface_t *qs, cairo_operator_t op)
{
if (qs->supports_porter_duff) {
switch (op) {
case CAIRO_OPERATOR_CLEAR:
case CAIRO_OPERATOR_SOURCE:
case CAIRO_OPERATOR_OVER:
case CAIRO_OPERATOR_IN:
case CAIRO_OPERATOR_OUT:
case CAIRO_OPERATOR_ATOP:
case CAIRO_OPERATOR_DEST:
case CAIRO_OPERATOR_DEST_OVER:
case CAIRO_OPERATOR_DEST_IN:
case CAIRO_OPERATOR_DEST_OUT:
case CAIRO_OPERATOR_DEST_ATOP:
case CAIRO_OPERATOR_XOR:
return TRUE;
default:
ASSERT_NOT_REACHED;
case CAIRO_OPERATOR_ADD:
case CAIRO_OPERATOR_SATURATE:
case CAIRO_OPERATOR_MULTIPLY:
case CAIRO_OPERATOR_SCREEN:
case CAIRO_OPERATOR_OVERLAY:
case CAIRO_OPERATOR_DARKEN:
case CAIRO_OPERATOR_LIGHTEN:
case CAIRO_OPERATOR_COLOR_DODGE:
case CAIRO_OPERATOR_COLOR_BURN:
case CAIRO_OPERATOR_HARD_LIGHT:
case CAIRO_OPERATOR_SOFT_LIGHT:
case CAIRO_OPERATOR_DIFFERENCE:
case CAIRO_OPERATOR_EXCLUSION:
case CAIRO_OPERATOR_HSL_HUE:
case CAIRO_OPERATOR_HSL_SATURATION:
case CAIRO_OPERATOR_HSL_COLOR:
case CAIRO_OPERATOR_HSL_LUMINOSITY:
return FALSE;
}
} else {
return op == CAIRO_OPERATOR_OVER;
}
}
static cairo_format_t
_cairo_format_from_qimage_format (QImage::Format fmt)
{
switch (fmt) {
case QImage::Format_ARGB32_Premultiplied:
return CAIRO_FORMAT_ARGB32;
case QImage::Format_RGB32:
return CAIRO_FORMAT_RGB24;
case QImage::Format_Indexed8: // XXX not quite
return CAIRO_FORMAT_A8;
#ifdef WORDS_BIGENDIAN
case QImage::Format_Mono:
#else
case QImage::Format_MonoLSB:
#endif
return CAIRO_FORMAT_A1;
case QImage::Format_Invalid:
#ifdef WORDS_BIGENDIAN
case QImage::Format_MonoLSB:
#else
case QImage::Format_Mono:
#endif
case QImage::Format_ARGB32:
case QImage::Format_RGB16:
case QImage::Format_ARGB8565_Premultiplied:
case QImage::Format_RGB666:
case QImage::Format_ARGB6666_Premultiplied:
case QImage::Format_RGB555:
case QImage::Format_ARGB8555_Premultiplied:
case QImage::Format_RGB888:
case QImage::Format_RGB444:
case QImage::Format_ARGB4444_Premultiplied:
case QImage::NImageFormats:
default:
ASSERT_NOT_REACHED;
return (cairo_format_t) -1;
}
}
static QImage::Format
_qimage_format_from_cairo_format (cairo_format_t fmt)
{
switch (fmt) {
case CAIRO_FORMAT_INVALID:
ASSERT_NOT_REACHED;
case CAIRO_FORMAT_ARGB32:
return QImage::Format_ARGB32_Premultiplied;
case CAIRO_FORMAT_RGB24:
return QImage::Format_RGB32;
case CAIRO_FORMAT_RGB16_565:
return QImage::Format_RGB16;
case CAIRO_FORMAT_A8:
return QImage::Format_Indexed8; // XXX not quite
case CAIRO_FORMAT_A1:
#ifdef WORDS_BIGENDIAN
return QImage::Format_Mono; // XXX think we need to choose between this and LSB
#else
return QImage::Format_MonoLSB;
#endif
}
return QImage::Format_Mono;
}
static inline QMatrix
_qmatrix_from_cairo_matrix (const cairo_matrix_t& m)
{
return QMatrix(m.xx, m.yx, m.xy, m.yy, m.x0, m.y0);
}
/* Path conversion */
typedef struct _qpainter_path_transform {
QPainterPath path;
const cairo_matrix_t *ctm_inverse;
} qpainter_path_data;
/* cairo path -> execute in context */
static cairo_status_t
_cairo_path_to_qpainterpath_move_to (void *closure, const cairo_point_t *point)
{
qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
if (pdata->ctm_inverse)
cairo_matrix_transform_point (pdata->ctm_inverse, &x, &y);
pdata->path.moveTo(x, y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_to_qpainterpath_line_to (void *closure, const cairo_point_t *point)
{
qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
if (pdata->ctm_inverse)
cairo_matrix_transform_point (pdata->ctm_inverse, &x, &y);
pdata->path.lineTo(x, y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_to_qpainterpath_curve_to (void *closure, const cairo_point_t *p0, const cairo_point_t *p1, const cairo_point_t *p2)
{
qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
double x0 = _cairo_fixed_to_double (p0->x);
double y0 = _cairo_fixed_to_double (p0->y);
double x1 = _cairo_fixed_to_double (p1->x);
double y1 = _cairo_fixed_to_double (p1->y);
double x2 = _cairo_fixed_to_double (p2->x);
double y2 = _cairo_fixed_to_double (p2->y);
if (pdata->ctm_inverse) {
cairo_matrix_transform_point (pdata->ctm_inverse, &x0, &y0);
cairo_matrix_transform_point (pdata->ctm_inverse, &x1, &y1);
cairo_matrix_transform_point (pdata->ctm_inverse, &x2, &y2);
}
pdata->path.cubicTo (x0, y0, x1, y1, x2, y2);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_to_qpainterpath_close_path (void *closure)
{
qpainter_path_data *pdata = static_cast <qpainter_path_data *> (closure);
pdata->path.closeSubpath();
return CAIRO_STATUS_SUCCESS;
}
static inline QPainterPath
path_to_qt (const cairo_path_fixed_t *path,
const cairo_matrix_t *ctm_inverse = NULL)
{
qpainter_path_data data;
cairo_status_t status;
if (ctm_inverse && _cairo_matrix_is_identity (ctm_inverse))
ctm_inverse = NULL;
data.ctm_inverse = ctm_inverse;
status = _cairo_path_fixed_interpret (path,
_cairo_path_to_qpainterpath_move_to,
_cairo_path_to_qpainterpath_line_to,
_cairo_path_to_qpainterpath_curve_to,
_cairo_path_to_qpainterpath_close_path,
&data);
assert (status == CAIRO_STATUS_SUCCESS);
return data.path;
}
static inline QPainterPath
path_to_qt (const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
cairo_matrix_t *ctm_inverse = NULL)
{
QPainterPath qpath = path_to_qt (path, ctm_inverse);
qpath.setFillRule (fill_rule == CAIRO_FILL_RULE_WINDING ?
Qt::WindingFill :
Qt::OddEvenFill);
return qpath;
}
/*
* Surface backend methods
*/
static cairo_surface_t *
_cairo_qt_surface_create_similar (void *abstract_surface,
cairo_content_t content,
int width,
int height)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
bool use_pixmap;
D(fprintf(stderr, "q[%p] create_similar: %d %d [%d] -> ", abstract_surface, width, height, content));
use_pixmap = qs->image == NULL;
if (use_pixmap) {
switch (content) {
case CAIRO_CONTENT_ALPHA:
use_pixmap = FALSE;
break;
case CAIRO_CONTENT_COLOR:
break;
case CAIRO_CONTENT_COLOR_ALPHA:
use_pixmap = ! _qpixmaps_have_no_alpha;
break;
}
}
if (use_pixmap) {
cairo_surface_t *result =
cairo_qt_surface_create_with_qpixmap (content, width, height);
/* XXX result->content is always content. ??? */
if (result->content == content) {
D(fprintf(stderr, "qpixmap content: %d\n", content));
return result;
}
_qpixmaps_have_no_alpha = TRUE;
cairo_surface_destroy (result);
}
D(fprintf (stderr, "qimage\n"));
return cairo_qt_surface_create_with_qimage
(_cairo_format_from_content (content), width, height);
}
static cairo_status_t
_cairo_qt_surface_finish (void *abstract_surface)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] finish\n", abstract_surface));
/* Only delete p if we created it */
if (qs->image || qs->pixmap)
delete qs->p;
else
qs->p->restore ();
if (qs->image_equiv)
cairo_surface_destroy (qs->image_equiv);
_cairo_surface_clipper_reset (&qs->clipper);
if (qs->image)
delete qs->image;
if (qs->pixmap)
delete qs->pixmap;
return CAIRO_STATUS_SUCCESS;
}
static void
_qimg_destroy (void *closure)
{
QImage *qimg = (QImage *) closure;
delete qimg;
}
static cairo_status_t
_cairo_qt_surface_acquire_source_image (void *abstract_surface,
cairo_image_surface_t **image_out,
void **image_extra)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] acquire_source_image\n", abstract_surface));
*image_extra = NULL;
if (qs->image_equiv) {
*image_out = (cairo_image_surface_t*)
cairo_surface_reference (qs->image_equiv);
return CAIRO_STATUS_SUCCESS;
}
if (qs->pixmap) {
QImage *qimg = new QImage(qs->pixmap->toImage());
cairo_surface_t *image;
cairo_status_t status;
image = cairo_image_surface_create_for_data (qimg->bits(),
_cairo_format_from_qimage_format (qimg->format()),
qimg->width(), qimg->height(),
qimg->bytesPerLine());
status = _cairo_user_data_array_set_data (&image->user_data,
(const cairo_user_data_key_t *)&_qimg_destroy,
qimg,
_qimg_destroy);
if (status) {
cairo_surface_destroy (image);
return status;
}
*image_out = (cairo_image_surface_t *) image;
return CAIRO_STATUS_SUCCESS;
}
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
static void
_cairo_qt_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
//cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] release_source_image\n", abstract_surface));
cairo_surface_destroy (&image->base);
}
static cairo_status_t
_cairo_qt_surface_acquire_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t **image_out,
cairo_rectangle_int_t *image_rect,
void **image_extra)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
QImage *qimg = NULL;
D(fprintf(stderr, "q[%p] acquire_dest_image\n", abstract_surface));
*image_extra = NULL;
if (qs->image_equiv) {
*image_out = (cairo_image_surface_t*)
cairo_surface_reference (qs->image_equiv);
image_rect->x = qs->window.x();
image_rect->y = qs->window.y();
image_rect->width = qs->window.width();
image_rect->height = qs->window.height();
return CAIRO_STATUS_SUCCESS;
}
QPoint offset;
if (qs->pixmap) {
qimg = new QImage(qs->pixmap->toImage());
} else {
// Try to figure out what kind of QPaintDevice we have, and
// how we can grab an image from it
QPaintDevice *pd = qs->p->device();
if (!pd)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
QPaintDevice *rpd = QPainter::redirected(pd, &offset);
if (rpd)
pd = rpd;
if (pd->devType() == QInternal::Image) {
qimg = new QImage(((QImage*) pd)->copy());
} else if (pd->devType() == QInternal::Pixmap) {
qimg = new QImage(((QPixmap*) pd)->toImage());
} else if (pd->devType() == QInternal::Widget) {
qimg = new QImage(QPixmap::grabWindow(((QWidget*)pd)->winId()).toImage());
}
}
if (qimg == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
*image_out = (cairo_image_surface_t*)
cairo_image_surface_create_for_data (qimg->bits(),
_cairo_format_from_qimage_format (qimg->format()),
qimg->width(), qimg->height(),
qimg->bytesPerLine());
*image_extra = qimg;
image_rect->x = qs->window.x() + offset.x();
image_rect->y = qs->window.y() + offset.y();
image_rect->width = qs->window.width() - offset.x();
image_rect->height = qs->window.height() - offset.y();
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_qt_surface_release_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t *image,
cairo_rectangle_int_t *image_rect,
void *image_extra)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] release_dest_image\n", abstract_surface));
cairo_surface_destroy (&image->base);
if (image_extra) {
QImage *qimg = (QImage*) image_extra;
// XXX should I be using setBackgroundMode here instead of setCompositionMode?
if (qs->supports_porter_duff)
qs->p->setCompositionMode (QPainter::CompositionMode_Source);
qs->p->drawImage (image_rect->x, image_rect->y, *qimg);
if (qs->supports_porter_duff)
qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);
delete qimg;
}
}
static cairo_bool_t
_cairo_qt_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *extents)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
extents->x = qs->window.x();
extents->y = qs->window.y();
extents->width = qs->window.width();
extents->height = qs->window.height();
return TRUE;
}
static cairo_status_t
_cairo_qt_surface_clipper_intersect_clip_path (cairo_surface_clipper_t *clipper,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_qt_surface_t *qs = cairo_container_of (clipper,
cairo_qt_surface_t,
clipper);
if (path == NULL) {
if (qs->pixmap || qs->image) {
// we own p
qs->p->setClipping (false);
} else {
qs->p->restore ();
qs->p->save ();
}
} else {
// XXX Antialiasing is ignored
qs->p->setClipPath (path_to_qt (path, fill_rule), Qt::IntersectClip);
}
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_qt_surface_set_clip_region (cairo_qt_surface_t *qs,
const cairo_region_t *clip_region)
{
_cairo_surface_clipper_reset (&qs->clipper);
if (clip_region == NULL) {
// How the clip path is reset depends on whether we own p or not
if (qs->pixmap || qs->image) {
// we own p
qs->p->setClipping (false);
} else {
qs->p->restore ();
qs->p->save ();
}
} else {
QRegion qr;
int num_rects = cairo_region_num_rectangles (clip_region);
for (int i = 0; i < num_rects; ++i) {
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (clip_region, i, &rect);
QRect r(rect.x, rect.y, rect.width, rect.height);
qr = qr.unite(r);
}
qs->p->setClipRegion (qr, Qt::IntersectClip);
}
}
static cairo_int_status_t
_cairo_qt_surface_set_clip (cairo_qt_surface_t *qs,
const cairo_clip_t *clip)
{
cairo_int_status_t status;
D(fprintf(stderr, "q[%p] intersect_clip_path %s\n", abstract_surface, path ? "(path)" : "(clear)"));
if (clip == NULL) {
_cairo_surface_clipper_reset (&qs->clipper);
// How the clip path is reset depends on whether we own p or not
if (qs->pixmap || qs->image) {
// we own p
qs->p->setClipping (false);
} else {
qs->p->restore ();
qs->p->save ();
}
return CAIRO_INT_STATUS_SUCCESS;
}
#if ENABLE_FAST_CLIP
// Qt will implicitly enable clipping, and will use ReplaceClip
// instead of IntersectClip if clipping was disabled before
// Note: Qt is really bad at dealing with clip paths. It doesn't
// seem to usefully recognize rectangular paths, instead going down
// extremely slow paths whenever a clip path is set. So,
// we do a bunch of work here to try to get rectangles or regions
// down to Qt for clipping.
cairo_region_t *clip_region = NULL;
status = _cairo_clip_get_region (clip, &clip_region);
if (status == CAIRO_INT_STATUS_UNSUPPORTED) {
// We weren't able to extract a region from the traps.
// Just hand the path down to QPainter.
status = (cairo_int_status_t)
_cairo_surface_clipper_set_clip (&qs->clipper, clip);
} else if (status == CAIRO_INT_STATUS_SUCCESS) {
_cairo_qt_surface_set_clip_region (qs, clip_region);
status = CAIRO_INT_STATUS_SUCCESS;
}
#else
status = (cairo_int_status_t)
_cairo_surface_clipper_set_clip (&qs->clipper, clip);
#endif
return status;
}
/*
* Brush conversion
*/
struct PatternToBrushConverter {
PatternToBrushConverter (const cairo_pattern_t *pattern) :
mAcquiredImageParent(0),
mAcquiredImage(0),
mAcquiredImageExtra(0)
{
if (pattern->type == CAIRO_PATTERN_TYPE_SOLID) {
cairo_solid_pattern_t *solid = (cairo_solid_pattern_t*) pattern;
QColor color;
color.setRgbF(solid->color.red,
solid->color.green,
solid->color.blue,
solid->color.alpha);
mBrush = QBrush(color);
} else if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_pattern_t *spattern = (cairo_surface_pattern_t*) pattern;
cairo_surface_t *surface = spattern->surface;
if (surface->type == CAIRO_SURFACE_TYPE_QT) {
cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;
if (qs->image) {
mBrush = QBrush(*qs->image);
} else if (qs->pixmap) {
mBrush = QBrush(*qs->pixmap);
} else {
// do something smart
mBrush = QBrush(0xff0000ff);
}
} else {
cairo_image_surface_t *isurf = NULL;
if (surface->type == CAIRO_SURFACE_TYPE_IMAGE) {
isurf = (cairo_image_surface_t*) surface;
} else {
void *image_extra;
if (_cairo_surface_acquire_source_image (surface, &isurf, &image_extra) == CAIRO_STATUS_SUCCESS) {
mAcquiredImageParent = surface;
mAcquiredImage = isurf;
mAcquiredImageExtra = image_extra;
} else {
isurf = NULL;
}
}
if (isurf) {
mBrush = QBrush (QImage ((const uchar *) isurf->data,
isurf->width,
isurf->height,
isurf->stride,
_qimage_format_from_cairo_format (isurf->format)));
} else {
mBrush = QBrush(0x0000ffff);
}
}
} else if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR ||
pattern->type == CAIRO_PATTERN_TYPE_RADIAL)
{
QGradient *grad;
cairo_bool_t reverse_stops = FALSE;
cairo_bool_t emulate_reflect = FALSE;
double offset = 0.0;
cairo_extend_t extend = pattern->extend;
cairo_gradient_pattern_t *gpat = (cairo_gradient_pattern_t *) pattern;
if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR) {
cairo_linear_pattern_t *lpat = (cairo_linear_pattern_t *) pattern;
grad = new QLinearGradient (lpat->pd1.x, lpat->pd1.y,
lpat->pd2.x, lpat->pd2.y);
} else if (pattern->type == CAIRO_PATTERN_TYPE_RADIAL) {
cairo_radial_pattern_t *rpat = (cairo_radial_pattern_t *) pattern;
/* Based on the SVG surface code */
cairo_circle_double_t *c0, *c1;
double x0, y0, r0, x1, y1, r1;
if (rpat->cd1.radius < rpat->cd2.radius) {
c0 = &rpat->cd1;
c1 = &rpat->cd2;
reverse_stops = FALSE;
} else {
c0 = &rpat->cd2;
c1 = &rpat->cd1;
reverse_stops = TRUE;
}
x0 = c0->center.x;
y0 = c0->center.y;
r0 = c0->radius;
x1 = c1->center.x;
y1 = c1->center.y;
r1 = c1->radius;
if (r0 == r1) {
grad = new QRadialGradient (x1, y1, r1, x1, y1);
} else {
double fx = (r1 * x0 - r0 * x1) / (r1 - r0);
double fy = (r1 * y0 - r0 * y1) / (r1 - r0);
/* QPainter doesn't support the inner circle and use instead a gradient focal.
* That means we need to emulate the cairo behaviour by processing the
* cairo gradient stops.
* The CAIRO_EXTENT_NONE and CAIRO_EXTENT_PAD modes are quite easy to handle,
* it's just a matter of stop position translation and calculation of
* the corresponding SVG radial gradient focal.
* The CAIRO_EXTENT_REFLECT and CAIRO_EXTEND_REPEAT modes require to compute a new
* radial gradient, with an new outer circle, equal to r1 - r0 in the CAIRO_EXTEND_REPEAT
* case, and 2 * (r1 - r0) in the CAIRO_EXTENT_REFLECT case, and a new gradient stop
* list that maps to the original cairo stop list.
*/
if ((extend == CAIRO_EXTEND_REFLECT || extend == CAIRO_EXTEND_REPEAT) && r0 > 0.0) {
double r_org = r1;
double r, x, y;
if (extend == CAIRO_EXTEND_REFLECT) {
r1 = 2 * r1 - r0;
emulate_reflect = TRUE;
}
offset = fmod (r1, r1 - r0) / (r1 - r0) - 1.0;
r = r1 - r0;
/* New position of outer circle. */
x = r * (x1 - fx) / r_org + fx;
y = r * (y1 - fy) / r_org + fy;
x1 = x;
y1 = y;
r1 = r;
r0 = 0.0;
} else {
offset = r0 / r1;
}
grad = new QRadialGradient (x1, y1, r1, fx, fy);
if (extend == CAIRO_EXTEND_NONE && r0 != 0.0)
grad->setColorAt (r0 / r1, Qt::transparent);
}
}
switch (extend) {
case CAIRO_EXTEND_NONE:
case CAIRO_EXTEND_PAD:
grad->setSpread(QGradient::PadSpread);
grad->setColorAt (0.0, Qt::transparent);
grad->setColorAt (1.0, Qt::transparent);
break;
case CAIRO_EXTEND_REFLECT:
grad->setSpread(QGradient::ReflectSpread);
break;
case CAIRO_EXTEND_REPEAT:
grad->setSpread(QGradient::RepeatSpread);
break;
}
for (unsigned int i = 0; i < gpat->n_stops; i++) {
int index = i;
if (reverse_stops)
index = gpat->n_stops - i - 1;
double offset = gpat->stops[i].offset;
QColor color;
color.setRgbF (gpat->stops[i].color.red,
gpat->stops[i].color.green,
gpat->stops[i].color.blue,
gpat->stops[i].color.alpha);
if (emulate_reflect) {
offset = offset / 2.0;
grad->setColorAt (1.0 - offset, color);
}
grad->setColorAt (offset, color);
}
mBrush = QBrush(*grad);
delete grad;
}
if (mBrush.style() != Qt::NoBrush &&
pattern->type != CAIRO_PATTERN_TYPE_SOLID &&
! _cairo_matrix_is_identity (&pattern->matrix))
{
cairo_matrix_t pm = pattern->matrix;
cairo_status_t status = cairo_matrix_invert (&pm);
assert (status == CAIRO_STATUS_SUCCESS);
mBrush.setMatrix (_qmatrix_from_cairo_matrix (pm));
}
}
~PatternToBrushConverter () {
if (mAcquiredImageParent)
_cairo_surface_release_source_image (mAcquiredImageParent, mAcquiredImage, mAcquiredImageExtra);
}
operator QBrush& () {
return mBrush;
}
QBrush mBrush;
private:
cairo_surface_t *mAcquiredImageParent;
cairo_image_surface_t *mAcquiredImage;
void *mAcquiredImageExtra;
};
struct PatternToPenConverter {
PatternToPenConverter (const cairo_pattern_t *source,