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cairo/src/cairo-qt-surface.cpp
Andrea Canciani eaac0fa87e doc: Manually fix remaining warnings about symmetry 
The Python script is unable to fix all of the warnings, because some
point to comments that are not actually documentation.

Fixes the remaining 'documentation comment not closed with **/'
warnings.
2012-03-29 11:03:18 +02:00

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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 <vladimir@mozilla.com>
*/
/* 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,
const cairo_stroke_style_t *style) :
mBrushConverter(source)
{
Qt::PenJoinStyle join = Qt::MiterJoin;
Qt::PenCapStyle cap = Qt::SquareCap;
switch (style->line_cap) {
case CAIRO_LINE_CAP_BUTT:
cap = Qt::FlatCap;
break;
case CAIRO_LINE_CAP_ROUND:
cap = Qt::RoundCap;
break;
case CAIRO_LINE_CAP_SQUARE:
cap = Qt::SquareCap;
break;
}
switch (style->line_join) {
case CAIRO_LINE_JOIN_MITER:
join = Qt::MiterJoin;
break;
case CAIRO_LINE_JOIN_ROUND:
join = Qt::RoundJoin;
break;
case CAIRO_LINE_JOIN_BEVEL:
join = Qt::BevelJoin;
break;
}
mPen = QPen(mBrushConverter, style->line_width, Qt::SolidLine, cap, join);
mPen.setMiterLimit (style->miter_limit);
if (style->dash && style->num_dashes) {
Qt::PenStyle pstyle = Qt::NoPen;
if (style->num_dashes == 2) {
if ((style->dash[0] == style->line_width &&
style->dash[1] == style->line_width && style->line_width <= 2.0) ||
(style->dash[0] == 0.0 &&
style->dash[1] == style->line_width * 2 && cap == Qt::RoundCap))
{
pstyle = Qt::DotLine;
} else if (style->dash[0] == style->line_width * DASH_LENGTH &&
style->dash[1] == style->line_width * DASH_LENGTH &&
cap == Qt::FlatCap)
{
pstyle = Qt::DashLine;
}
}
if (pstyle != Qt::NoPen) {
mPen.setStyle(pstyle);
return;
}
unsigned int odd_dash = style->num_dashes % 2;
QVector<qreal> dashes (odd_dash ? style->num_dashes * 2 : style->num_dashes);
for (unsigned int i = 0; i < odd_dash+1; i++) {
for (unsigned int j = 0; j < style->num_dashes; j++) {
// In Qt, the dash lengths are given in units of line width, whereas
// in cairo, they are in user-space units. We'll always apply the CTM,
// so all we have to do here is divide cairo's dash lengths by the line
// width.
dashes.append (style->dash[j] / style->line_width);
}
}
mPen.setDashPattern(dashes);
mPen.setDashOffset(style->dash_offset / style->line_width);
}
}
~PatternToPenConverter() { }
operator QPen& () {
return mPen;
}
QPen mPen;
PatternToBrushConverter mBrushConverter;
};
/*
* Core drawing operations
*/
static bool
_cairo_qt_fast_fill (cairo_qt_surface_t *qs,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path = NULL,
cairo_fill_rule_t fill_rule = CAIRO_FILL_RULE_WINDING,
double tolerance = 0.0,
cairo_antialias_t antialias = CAIRO_ANTIALIAS_NONE)
{
#if ENABLE_FAST_FILL
QImage *qsSrc_image = NULL;
QPixmap *qsSrc_pixmap = NULL;
std::auto_ptr<QImage> qsSrc_image_d;
if (source->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_pattern_t *spattern = (cairo_surface_pattern_t*) source;
if (spattern->surface->type == CAIRO_SURFACE_TYPE_QT) {
cairo_qt_surface_t *p = (cairo_qt_surface_t*) spattern->surface;
qsSrc_image = p->image;
qsSrc_pixmap = p->pixmap;
} else if (spattern->surface->type == CAIRO_SURFACE_TYPE_IMAGE) {
cairo_image_surface_t *p = (cairo_image_surface_t*) spattern->surface;
qsSrc_image = new QImage((const uchar*) p->data,
p->width,
p->height,
p->stride,
_qimage_format_from_cairo_format(p->format));
qsSrc_image_d.reset(qsSrc_image);
}
}
if (!qsSrc_image && !qsSrc_pixmap)
return false;
// We can only drawTiledPixmap; there's no drawTiledImage
if (! qsSrc_pixmap &&
(source->extend == CAIRO_EXTEND_REPEAT ||
source->extend == CAIRO_EXTEND_REFLECT))
{
return false;
}
QMatrix sourceMatrix = _qmatrix_from_cairo_matrix (source->matrix);
// We can draw this faster by clipping and calling drawImage/drawPixmap.
// Use our own clipping function so that we can get the
// region handling to end up with the fastest possible clip.
//
// XXX Antialiasing will fail pretty hard here, since we can't clip with AA
// with QPainter.
qs->p->save();
if (path) {
cairo_int_status_t status;
cairo_clip_t clip, old_clip = qs->clipper.clip;
_cairo_clip_init_copy (&clip, &qs->clipper.clip);
status = (cairo_int_status_t) _cairo_clip_clip (&clip,
path,
fill_rule,
tolerance,
antialias);
if (unlikely (status)) {
qs->p->restore();
return false;
}
status = _cairo_qt_surface_set_clip (qs, &clip);
if (unlikely (status)) {
qs->p->restore();
return false;
}
_cairo_clip_reset (&clip);
qs->clipper.clip = old_clip;
}
qs->p->setWorldMatrix (sourceMatrix.inverted(), true);
switch (source->extend) {
case CAIRO_EXTEND_REPEAT:
// XXX handle reflect by tiling 4 times first
case CAIRO_EXTEND_REFLECT: {
assert (qsSrc_pixmap);
// Render the tiling to cover the entire destination window (because
// it'll be clipped). Transform the window rect by the inverse
// of the current world transform so that the device coordinates
// end up as the right thing.
QRectF dest = qs->p->worldTransform().inverted().mapRect(QRectF(qs->window));
QPointF origin = sourceMatrix.map(QPointF(0.0, 0.0));
qs->p->drawTiledPixmap (dest, *qsSrc_pixmap, origin);
}
break;
case CAIRO_EXTEND_NONE:
case CAIRO_EXTEND_PAD: // XXX not exactly right, but good enough
default:
if (qsSrc_image)
qs->p->drawImage (0, 0, *qsSrc_image);
else if (qsSrc_pixmap)
qs->p->drawPixmap (0, 0, *qsSrc_pixmap);
break;
}
qs->p->restore();
return true;
#else
return false;
#endif
}
static cairo_int_status_t
_cairo_qt_surface_paint (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
cairo_int_status_t status;
D(fprintf(stderr, "q[%p] paint op:%s\n", abstract_surface, _opstr(op)));
if (!qs->p)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! _op_is_supported (qs, op))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_qt_surface_set_clip (qs, clip);
if (unlikely (status))
return status;
if (qs->supports_porter_duff)
qs->p->setCompositionMode (_qpainter_compositionmode_from_cairo_op (op));
if (! _cairo_qt_fast_fill (qs, source)) {
PatternToBrushConverter brush (source);
qs->p->fillRect (qs->window, brush);
}
if (qs->supports_porter_duff)
qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_qt_surface_fill (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] fill op:%s\n", abstract_surface, _opstr(op)));
if (!qs->p)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! _op_is_supported (qs, op))
return CAIRO_INT_STATUS_UNSUPPORTED;
cairo_int_status_t status = _cairo_qt_surface_set_clip (qs, clip);
if (unlikely (status))
return status;
if (qs->supports_porter_duff)
qs->p->setCompositionMode (_qpainter_compositionmode_from_cairo_op (op));
// XXX Qt4.3, 4.4 misrenders some complex paths if antialiasing is
// enabled
//qs->p->setRenderHint (QPainter::Antialiasing, antialias == CAIRO_ANTIALIAS_NONE ? false : true);
qs->p->setRenderHint (QPainter::SmoothPixmapTransform, source->filter != CAIRO_FILTER_FAST);
if (! _cairo_qt_fast_fill (qs, source,
path, fill_rule, tolerance, antialias))
{
PatternToBrushConverter brush(source);
qs->p->fillPath (path_to_qt (path, fill_rule), brush);
}
if (qs->supports_porter_duff)
qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_qt_surface_stroke (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] stroke op:%s\n", abstract_surface, _opstr(op)));
if (!qs->p)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! _op_is_supported (qs, op))
return CAIRO_INT_STATUS_UNSUPPORTED;
cairo_int_status_t int_status = _cairo_qt_surface_set_clip (qs, clip);
if (unlikely (int_status))
return int_status;
QMatrix savedMatrix = qs->p->worldMatrix();
if (qs->supports_porter_duff)
qs->p->setCompositionMode (_qpainter_compositionmode_from_cairo_op (op));
qs->p->setWorldMatrix (_qmatrix_from_cairo_matrix (*ctm), true);
// XXX Qt4.3, 4.4 misrenders some complex paths if antialiasing is
// enabled
//qs->p->setRenderHint (QPainter::Antialiasing, antialias == CAIRO_ANTIALIAS_NONE ? false : true);
qs->p->setRenderHint (QPainter::SmoothPixmapTransform, source->filter != CAIRO_FILTER_FAST);
PatternToPenConverter pen(source, style);
qs->p->setPen(pen);
qs->p->drawPath(path_to_qt (path, ctm_inverse));
qs->p->setPen(Qt::black);
qs->p->setWorldMatrix (savedMatrix, false);
if (qs->supports_porter_duff)
qs->p->setCompositionMode (QPainter::CompositionMode_SourceOver);
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_qt_surface_show_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip)
{
#if (QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)) || defined(QT_GLYPHS_API_BACKPORT)
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
// pick out the colour to use from the cairo source
cairo_solid_pattern_t *solid = (cairo_solid_pattern_t*) source;
cairo_scaled_glyph_t* glyph;
// documentation says you have to freeze the cache, but I don't believe it
_cairo_scaled_font_freeze_cache(scaled_font);
QColor tempColour(solid->color.red * 255, solid->color.green * 255, solid->color.blue * 255);
QVarLengthArray<QPointF> positions(num_glyphs);
QVarLengthArray<unsigned int> glyphss(num_glyphs);
FT_Face face = cairo_ft_scaled_font_lock_face (scaled_font);
const FT_Size_Metrics& ftMetrics = face->size->metrics;
QFont font(face->family_name);
font.setStyleStrategy(QFont::NoFontMerging);
font.setBold(face->style_flags & FT_STYLE_FLAG_BOLD);
font.setItalic(face->style_flags & FT_STYLE_FLAG_ITALIC);
font.setKerning(face->face_flags & FT_FACE_FLAG_KERNING);
font.setPixelSize(ftMetrics.y_ppem);
cairo_ft_scaled_font_unlock_face(scaled_font);
qs->p->setFont(font);
qs->p->setPen(tempColour);
for (int currentGlyph = 0; currentGlyph < num_glyphs; currentGlyph++) {
positions[currentGlyph].setX(glyphs[currentGlyph].x);
positions[currentGlyph].setY(glyphs[currentGlyph].y);
glyphss[currentGlyph] = glyphs[currentGlyph].index;
}
qt_draw_glyphs(qs->p, glyphss.data(), positions.data(), num_glyphs);
_cairo_scaled_font_thaw_cache(scaled_font);
return CAIRO_INT_STATUS_SUCCESS;
#else
return CAIRO_INT_STATUS_UNSUPPORTED;
#endif
}
static cairo_int_status_t
_cairo_qt_surface_mask (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
const cairo_clip_t *clip)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
D(fprintf(stderr, "q[%p] mask op:%s\n", abstract_surface, _opstr(op)));
if (!qs->p)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (mask->type == CAIRO_PATTERN_TYPE_SOLID) {
cairo_solid_pattern_t *solid_mask = (cairo_solid_pattern_t *) mask;
cairo_int_status_t result;
qs->p->setOpacity (solid_mask->color.alpha);
result = _cairo_qt_surface_paint (abstract_surface, op, source, clip);
qs->p->setOpacity (1.0);
return result;
}
// otherwise skip for now
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static cairo_status_t
_cairo_qt_surface_mark_dirty (void *abstract_surface,
int x, int y,
int width, int height)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t *) abstract_surface;
if (qs->p && !(qs->image || qs->pixmap))
qs->p->save ();
return CAIRO_STATUS_SUCCESS;
}
/*
* Backend struct
*/
static const cairo_surface_backend_t cairo_qt_surface_backend = {
CAIRO_SURFACE_TYPE_QT,
_cairo_qt_surface_finish,
_cairo_default_context_create, /* XXX */
_cairo_qt_surface_create_similar,
NULL, /* similar image */
NULL, /* map to image */
NULL, /* unmap image */
_cairo_surface_default_source,
_cairo_qt_surface_acquire_source_image,
_cairo_qt_surface_release_source_image,
NULL, /* snapshot */
NULL, /* copy_page */
NULL, /* show_page */
_cairo_qt_surface_get_extents,
NULL, /* get_font_options */
NULL, /* flush */
_cairo_qt_surface_mark_dirty,
_cairo_qt_surface_paint,
_cairo_qt_surface_mask,
_cairo_qt_surface_stroke,
_cairo_qt_surface_fill,
NULL, /* fill_stroke */
_cairo_qt_surface_show_glyphs
};
cairo_surface_t *
cairo_qt_surface_create (QPainter *painter)
{
cairo_qt_surface_t *qs;
qs = (cairo_qt_surface_t *) malloc (sizeof(cairo_qt_surface_t));
if (qs == NULL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
memset (qs, 0, sizeof(cairo_qt_surface_t));
_cairo_surface_init (&qs->base,
&cairo_qt_surface_backend,
NULL, /* device */
CAIRO_CONTENT_COLOR_ALPHA);
_cairo_surface_clipper_init (&qs->clipper,
_cairo_qt_surface_clipper_intersect_clip_path);
qs->p = painter;
if (qs->p->paintEngine())
qs->supports_porter_duff = qs->p->paintEngine()->hasFeature(QPaintEngine::PorterDuff);
else
qs->supports_porter_duff = FALSE;
// Save so that we can always get back to the original state
qs->p->save();
qs->window = painter->window();
D(fprintf(stderr, "qpainter_surface_create: window: [%d %d %d %d] pd:%d\n",
qs->window.x(), qs->window.y(), qs->window.width(), qs->window.height(),
qs->supports_porter_duff));
return &qs->base;
}
cairo_surface_t *
cairo_qt_surface_create_with_qimage (cairo_format_t format,
int width,
int height)
{
cairo_qt_surface_t *qs;
qs = (cairo_qt_surface_t *) malloc (sizeof(cairo_qt_surface_t));
if (qs == NULL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
memset (qs, 0, sizeof(cairo_qt_surface_t));
_cairo_surface_init (&qs->base,
&cairo_qt_surface_backend,
NULL, /* device */
_cairo_content_from_format (format));
_cairo_surface_clipper_init (&qs->clipper,
_cairo_qt_surface_clipper_intersect_clip_path);
QImage *image = new QImage (width, height,
_qimage_format_from_cairo_format (format));
qs->image = image;
if (!image->isNull()) {
qs->p = new QPainter(image);
qs->supports_porter_duff = qs->p->paintEngine()->hasFeature(QPaintEngine::PorterDuff);
}
qs->image_equiv = cairo_image_surface_create_for_data (image->bits(),
format,
width, height,
image->bytesPerLine());
qs->window = QRect(0, 0, width, height);
D(fprintf(stderr, "qpainter_surface_create: qimage: [%d %d %d %d] pd:%d\n",
qs->window.x(), qs->window.y(), qs->window.width(), qs->window.height(),
qs->supports_porter_duff));
return &qs->base;
}
cairo_surface_t *
cairo_qt_surface_create_with_qpixmap (cairo_content_t content,
int width,
int height)
{
cairo_qt_surface_t *qs;
if ((content & CAIRO_CONTENT_COLOR) == 0)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));
qs = (cairo_qt_surface_t *) malloc (sizeof(cairo_qt_surface_t));
if (qs == NULL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
memset (qs, 0, sizeof(cairo_qt_surface_t));
QPixmap *pixmap = new QPixmap (width, height);
if (pixmap == NULL) {
free (qs);
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
}
// By default, a QPixmap is opaque; however, if it's filled
// with a color with a transparency component, it is converted
// to a format that preserves transparency.
if (content == CAIRO_CONTENT_COLOR_ALPHA)
pixmap->fill(Qt::transparent);
_cairo_surface_init (&qs->base,
&cairo_qt_surface_backend,
NULL, /* device */
content);
_cairo_surface_clipper_init (&qs->clipper,
_cairo_qt_surface_clipper_intersect_clip_path);
qs->pixmap = pixmap;
if (!pixmap->isNull()) {
qs->p = new QPainter(pixmap);
qs->supports_porter_duff = qs->p->paintEngine()->hasFeature(QPaintEngine::PorterDuff);
}
qs->window = QRect(0, 0, width, height);
D(fprintf(stderr, "qpainter_surface_create: qpixmap: [%d %d %d %d] pd:%d\n",
qs->window.x(), qs->window.y(), qs->window.width(), qs->window.height(),
qs->supports_porter_duff));
return &qs->base;
}
QPainter *
cairo_qt_surface_get_qpainter (cairo_surface_t *surface)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;
if (surface->type != CAIRO_SURFACE_TYPE_QT)
return NULL;
return qs->p;
}
QImage *
cairo_qt_surface_get_qimage (cairo_surface_t *surface)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;
if (surface->type != CAIRO_SURFACE_TYPE_QT)
return NULL;
return qs->image;
}
cairo_surface_t *
cairo_qt_surface_get_image (cairo_surface_t *surface)
{
cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;
if (surface->type != CAIRO_SURFACE_TYPE_QT)
return NULL;
return qs->image_equiv;
}
/*
* TODO:
*
* - Figure out why QBrush isn't working with non-repeated images
*
* - Correct repeat mode; right now, every surface source is EXTEND_REPEAT
* - implement EXTEND_NONE (?? probably need to clip to the extents of the source)
* - implement EXTEND_REFLECT (create temporary and copy 4x, then EXTEND_REPEAT that)
*
* - stroke-image failure
*
* - Implement mask() with non-solid masks (probably will need to use a temporary and use IN)
*
* - Implement gradient sources
*
* - Make create_similar smarter -- create QPixmaps in more circumstances
* (e.g. if the pixmap can have alpha)
*
* - Implement show_glyphs() in terms of Qt
*
*/
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