static cairo_bool_t
_cairo_surface_wrapper_needs_device_transform (cairo_surface_wrapper_t *wrapper)
{
return
(wrapper->has_extents && (wrapper->extents.x | wrapper->extents.y)) ||
! _cairo_matrix_is_identity (&wrapper->transform) ||
! _cairo_matrix_is_identity (&wrapper->target->device_transform);
}
static void
_cairo_surface_wrapper_get_transform (cairo_surface_wrapper_t *wrapper,
cairo_matrix_t *m)
{
cairo_matrix_init_identity (m);
if (! _cairo_matrix_is_identity (&wrapper->transform))
cairo_matrix_multiply (m, &wrapper->transform, m);
if (! _cairo_matrix_is_identity (&wrapper->target->device_transform))
cairo_matrix_multiply (m, &wrapper->target->device_transform, m);
}
static void
_cairo_surface_wrapper_get_transform (cairo_surface_wrapper_t *wrapper,
cairo_matrix_t *m)
{
cairo_matrix_init_identity (m);
if (wrapper->has_extents && (wrapper->extents.x || wrapper->extents.y))
cairo_matrix_translate (m, -wrapper->extents.x, -wrapper->extents.y);
if (! _cairo_matrix_is_identity (&wrapper->transform))
cairo_matrix_multiply (m, &wrapper->transform, m);
if (! _cairo_matrix_is_identity (&wrapper->target->device_transform))
cairo_matrix_multiply (m, &wrapper->target->device_transform, m);
}
cairo_private void
_cairo_analysis_surface_set_ctm (cairo_surface_t *abstract_surface,
cairo_matrix_t *ctm)
{
cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
surface->ctm = *ctm;
surface->has_ctm = !_cairo_matrix_is_identity (&surface->ctm);
}
static void
_copy_transformed_pattern (cairo_pattern_t *pattern,
const cairo_pattern_t *original,
const cairo_matrix_t *ctm_inverse)
{
_cairo_pattern_init_static_copy (pattern, original);
if (! _cairo_matrix_is_identity (ctm_inverse))
_cairo_pattern_transform (pattern, ctm_inverse);
}
static void
_cairo_surface_wrapper_get_inverse_transform (cairo_surface_wrapper_t *wrapper,
cairo_matrix_t *m)
{
cairo_matrix_init_identity (m);
if (! _cairo_matrix_is_identity (&wrapper->target->device_transform_inverse))
cairo_matrix_multiply (m, &wrapper->target->device_transform_inverse, m);
if (! _cairo_matrix_is_identity (&wrapper->transform)) {
cairo_matrix_t inv;
cairo_status_t status;
inv = wrapper->transform;
status = cairo_matrix_invert (&inv);
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_multiply (m, &inv, m);
}
}
static cairo_bool_t
_cairo_surface_wrapper_needs_device_transform (cairo_surface_wrapper_t *wrapper,
cairo_matrix_t *matrix)
{
if (_cairo_matrix_is_identity (&wrapper->target->device_transform))
return FALSE;
*matrix = wrapper->target->device_transform;
return TRUE;
}
static cairo_int_status_t
_analyze_meta_surface_pattern (cairo_analysis_surface_t *surface,
const cairo_pattern_t *pattern)
{
cairo_surface_t *analysis = &surface->base;
const cairo_surface_pattern_t *surface_pattern;
cairo_status_t status;
cairo_bool_t old_has_ctm;
cairo_matrix_t old_ctm, p2d;
cairo_rectangle_int_t old_clip;
cairo_rectangle_int_t meta_extents;
int old_width;
int old_height;
assert (pattern->type == CAIRO_PATTERN_TYPE_SURFACE);
surface_pattern = (const cairo_surface_pattern_t *) pattern;
assert (_cairo_surface_is_meta (surface_pattern->surface));
old_width = surface->width;
old_height = surface->height;
old_clip = surface->current_clip;
status = _cairo_surface_get_extents (surface_pattern->surface, &meta_extents);
if (_cairo_status_is_error (status))
return status;
surface->width = meta_extents.width;
surface->height = meta_extents.height;
surface->current_clip.x = 0;
surface->current_clip.y = 0;
surface->current_clip.width = surface->width;
surface->current_clip.height = surface->height;
old_ctm = surface->ctm;
old_has_ctm = surface->has_ctm;
p2d = pattern->matrix;
status = cairo_matrix_invert (&p2d);
/* _cairo_pattern_set_matrix guarantees invertibility */
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_multiply (&surface->ctm, &p2d, &surface->ctm);
surface->has_ctm = !_cairo_matrix_is_identity (&surface->ctm);
status = _cairo_meta_surface_replay_and_create_regions (surface_pattern->surface,
analysis);
if (status == CAIRO_STATUS_SUCCESS)
status = analysis->status;
surface->ctm = old_ctm;
surface->has_ctm = old_has_ctm;
surface->current_clip = old_clip;
surface->width = old_width;
surface->height = old_height;
return status;
}
static void
_cairo_xml_emit_matrix (cairo_xml_t *xml,
const cairo_matrix_t *matrix)
{
if (! _cairo_matrix_is_identity (matrix)) {
_cairo_xml_printf (xml, "<matrix>%f %f %f %f %f %f</matrix>",
matrix->xx, matrix->yx,
matrix->xy, matrix->yy,
matrix->x0, matrix->y0);
}
}
void
_cairo_analysis_surface_set_ctm (cairo_surface_t *abstract_surface,
cairo_matrix_t *ctm)
{
cairo_analysis_surface_t *surface;
if (abstract_surface->status)
return;
surface = (cairo_analysis_surface_t *) abstract_surface;
surface->ctm = *ctm;
surface->has_ctm = !_cairo_matrix_is_identity (&surface->ctm);
}
static cairo_int_status_t
_analyze_recording_surface_pattern (cairo_analysis_surface_t *surface,
const cairo_pattern_t *pattern)
{
const cairo_surface_pattern_t *surface_pattern;
cairo_analysis_surface_t *tmp;
cairo_surface_t *source, *proxy;
cairo_matrix_t p2d;
cairo_status_t status, analysis_status;
assert (pattern->type == CAIRO_PATTERN_TYPE_SURFACE);
surface_pattern = (const cairo_surface_pattern_t *) pattern;
assert (surface_pattern->surface->type == CAIRO_SURFACE_TYPE_RECORDING);
source = surface_pattern->surface;
proxy = _cairo_surface_has_snapshot (source, &proxy_backend);
if (proxy != NULL) {
/* nothing untoward found so far */
return CAIRO_STATUS_SUCCESS;
}
tmp = (cairo_analysis_surface_t *)
_cairo_analysis_surface_create (surface->target);
if (unlikely (tmp->base.status))
return tmp->base.status;
proxy = attach_proxy (source, &tmp->base);
p2d = pattern->matrix;
status = cairo_matrix_invert (&p2d);
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_multiply (&tmp->ctm, &p2d, &surface->ctm);
tmp->has_ctm = ! _cairo_matrix_is_identity (&tmp->ctm);
if (_cairo_surface_is_snapshot (source))
source = _cairo_surface_snapshot_get_target (source);
if (_cairo_surface_is_subsurface (source))
source = _cairo_surface_subsurface_get_target (source);
status = _cairo_recording_surface_replay_and_create_regions (source,
&tmp->base);
analysis_status = tmp->has_unsupported ? CAIRO_INT_STATUS_IMAGE_FALLBACK : CAIRO_INT_STATUS_SUCCESS;
detach_proxy (proxy);
cairo_surface_destroy (&tmp->base);
if (unlikely (status))
return status;
return analysis_status;
}
cairo_status_t
_cairo_clip_init_copy_transformed (cairo_clip_t *clip,
cairo_clip_t *other,
const cairo_matrix_t *matrix)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
int tx, ty;
if (other == NULL) {
_cairo_clip_init (clip);
return CAIRO_STATUS_SUCCESS;
}
if (other->all_clipped) {
_cairo_clip_init (clip);
clip->all_clipped = TRUE;
return CAIRO_STATUS_SUCCESS;
}
if (_cairo_matrix_is_identity (matrix)) {
_cairo_clip_init_copy (clip, other);
return CAIRO_STATUS_SUCCESS;
}
if (other->path != NULL) {
_cairo_clip_init (clip);
/* if we only need to translate, so we can reuse the caches... */
/* XXX we still loose the benefit of constructs when the copy is
* deleted though. Indirect clip_paths?
*/
if (_cairo_matrix_is_integer_translation (matrix, &tx, &ty)) {
status = _cairo_clip_path_reapply_clip_path_translate (clip,
other->path,
tx, ty);
} else {
status = _cairo_clip_path_reapply_clip_path_transform (clip,
other->path,
matrix);
if (clip->path->extents.width == 0 &&
clip->path->extents.height == 0)
{
_cairo_clip_set_all_clipped (clip);
}
}
}
return status;
}
void
_cairo_surface_wrapper_init (cairo_surface_wrapper_t *wrapper,
cairo_surface_t *target)
{
wrapper->target = cairo_surface_reference (target);
cairo_matrix_init_identity (&wrapper->transform);
wrapper->has_extents = FALSE;
wrapper->extents.x = wrapper->extents.y = 0;
wrapper->clip = NULL;
wrapper->needs_transform = FALSE;
if (target) {
wrapper->needs_transform =
! _cairo_matrix_is_identity (&target->device_transform);
}
}
static cairo_clip_t *
_cairo_surface_wrapper_get_clip (cairo_surface_wrapper_t *wrapper,
const cairo_clip_t *clip)
{
cairo_clip_t *copy;
copy = _cairo_clip_copy (clip);
if (wrapper->has_extents) {
copy = _cairo_clip_intersect_rectangle (copy, &wrapper->extents);
}
copy = _cairo_clip_transform (copy, &wrapper->transform);
if (! _cairo_matrix_is_identity (&wrapper->target->device_transform))
copy = _cairo_clip_transform (copy, &wrapper->target->device_transform);
if (wrapper->clip)
copy = _cairo_clip_intersect_clip (copy, wrapper->clip);
return copy;
}
void
_cairo_surface_wrapper_set_inverse_transform (cairo_surface_wrapper_t *wrapper,
const cairo_matrix_t *transform)
{
cairo_status_t status;
if (transform == NULL || _cairo_matrix_is_identity (transform)) {
cairo_matrix_init_identity (&wrapper->transform);
wrapper->needs_transform =
_cairo_surface_wrapper_needs_device_transform (wrapper);
} else {
wrapper->transform = *transform;
status = cairo_matrix_invert (&wrapper->transform);
/* should always be invertible unless given pathological input */
assert (status == CAIRO_STATUS_SUCCESS);
wrapper->needs_transform = TRUE;
}
}
static void _cairo_matrix_to_render_matrix (const cairo_matrix_t *matrix, s_render_matrix_t *render_matrix)
{
static const s_render_matrix_t render_identity_matrix = {{
{1 << 16, 0, 0},
{ 0, 1 << 16, 0},
{ 0, 0, 1 << 16}
}};
if (_cairo_matrix_is_identity(matrix)) {
*render_matrix = render_identity_matrix;
} else {
render_matrix->matrix[0][0] = _cairo_fixed_from_double(matrix->xx);
render_matrix->matrix[0][1] = _cairo_fixed_from_double(matrix->xy);
render_matrix->matrix[0][2] = _cairo_fixed_from_double(matrix->x0);
render_matrix->matrix[1][0] = _cairo_fixed_from_double(matrix->yx);
render_matrix->matrix[1][1] = _cairo_fixed_from_double(matrix->yy);
render_matrix->matrix[1][2] = _cairo_fixed_from_double(matrix->y0);
render_matrix->matrix[2][0] = 0;
render_matrix->matrix[2][1] = 0;
render_matrix->matrix[2][2] = 1 << 16;
}
}
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 SkPath
path_to_sk (cairo_path_fixed_t *path,
cairo_matrix_t *mat = NULL)
{
struct cpc data;
cairo_status_t status;
if (mat && _cairo_matrix_is_identity (mat))
mat = NULL;
data.matrix = mat;
status = _cairo_path_fixed_interpret (path,
cpc_move_to,
cpc_line_to,
cpc_curve_to,
cpc_close_path,
&data);
assert (status == CAIRO_STATUS_SUCCESS);
return data.skPath;
}
static void
_copy_transformed_pattern (cairo_pattern_t *pattern,
const cairo_pattern_t *original,
const cairo_matrix_t *ctm_inverse)
{
_cairo_pattern_init_static_copy (pattern, original);
/* apply device_transform first so that it is transformed by ctm_inverse */
if (original->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_pattern_t *surface_pattern;
cairo_surface_t *surface;
surface_pattern = (cairo_surface_pattern_t *) original;
surface = surface_pattern->surface;
if (_cairo_surface_has_device_transform (surface))
_cairo_pattern_transform (pattern, &surface->device_transform);
}
if (! _cairo_matrix_is_identity (ctm_inverse))
_cairo_pattern_transform (pattern, ctm_inverse);
}
static void
compute_face (const cairo_point_t *point,
const cairo_slope_t *dev_slope,
struct stroker *stroker,
cairo_stroke_face_t *face)
{
double face_dx, face_dy;
cairo_point_t offset_ccw, offset_cw;
double slope_dx, slope_dy;
slope_dx = _cairo_fixed_to_double (dev_slope->dx);
slope_dy = _cairo_fixed_to_double (dev_slope->dy);
face->length = normalize_slope (&slope_dx, &slope_dy);
face->dev_slope.x = slope_dx;
face->dev_slope.y = slope_dy;
/*
* rotate to get a line_width/2 vector along the face, note that
* the vector must be rotated the right direction in device space,
* but by 90° in user space. So, the rotation depends on
* whether the ctm reflects or not, and that can be determined
* by looking at the determinant of the matrix.
*/
if (! _cairo_matrix_is_identity (stroker->ctm_inverse)) {
/* Normalize the matrix! */
cairo_matrix_transform_distance (stroker->ctm_inverse,
&slope_dx, &slope_dy);
normalize_slope (&slope_dx, &slope_dy);
if (stroker->ctm_det_positive) {
face_dx = - slope_dy * (stroker->style.line_width / 2.0);
face_dy = slope_dx * (stroker->style.line_width / 2.0);
} else {
face_dx = slope_dy * (stroker->style.line_width / 2.0);
face_dy = - slope_dx * (stroker->style.line_width / 2.0);
}
/* back to device space */
cairo_matrix_transform_distance (stroker->ctm, &face_dx, &face_dy);
} else {
face_dx = - slope_dy * (stroker->style.line_width / 2.0);
face_dy = slope_dx * (stroker->style.line_width / 2.0);
}
offset_ccw.x = _cairo_fixed_from_double (face_dx);
offset_ccw.y = _cairo_fixed_from_double (face_dy);
offset_cw.x = -offset_ccw.x;
offset_cw.y = -offset_ccw.y;
face->ccw = *point;
translate_point (&face->ccw, &offset_ccw);
face->point = *point;
face->cw = *point;
translate_point (&face->cw, &offset_cw);
face->usr_vector.x = slope_dx;
face->usr_vector.y = slope_dy;
face->dev_vector = *dev_slope;
}
void
_cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
pixman_transform_t *pixman_transform,
double xc,
double yc)
{
static const pixman_transform_t pixman_identity_transform = {{
{1 << 16, 0, 0},
{ 0, 1 << 16, 0},
{ 0, 0, 1 << 16}
}};
if (_cairo_matrix_is_identity (matrix)) {
*pixman_transform = pixman_identity_transform;
} else {
cairo_matrix_t inv;
unsigned max_iterations;
pixman_transform->matrix[0][0] = _cairo_fixed_16_16_from_double (matrix->xx);
pixman_transform->matrix[0][1] = _cairo_fixed_16_16_from_double (matrix->xy);
pixman_transform->matrix[0][2] = _cairo_fixed_16_16_from_double (matrix->x0);
pixman_transform->matrix[1][0] = _cairo_fixed_16_16_from_double (matrix->yx);
pixman_transform->matrix[1][1] = _cairo_fixed_16_16_from_double (matrix->yy);
pixman_transform->matrix[1][2] = _cairo_fixed_16_16_from_double (matrix->y0);
pixman_transform->matrix[2][0] = 0;
pixman_transform->matrix[2][1] = 0;
pixman_transform->matrix[2][2] = 1 << 16;
/* The conversion above breaks cairo's translation invariance:
* a translation of (a, b) in device space translates to
* a translation of (xx * a + xy * b, yx * a + yy * b)
* for cairo, while pixman uses rounded versions of xx ... yy.
* This error increases as a and b get larger.
*
* To compensate for this, we fix the point (xc, yc) in pattern
* space and adjust pixman's transform to agree with cairo's at
* that point.
*/
if (_cairo_matrix_has_unity_scale (matrix))
return;
/* Note: If we can't invert the transformation, skip the adjustment. */
inv = *matrix;
if (cairo_matrix_invert (&inv) != CAIRO_STATUS_SUCCESS)
return;
/* find the pattern space coordinate that maps to (xc, yc) */
xc += .5; yc += .5; /* offset for the pixel centre */
max_iterations = 5;
do {
double x,y;
pixman_vector_t vector;
cairo_fixed_16_16_t dx, dy;
vector.vector[0] = _cairo_fixed_16_16_from_double (xc);
vector.vector[1] = _cairo_fixed_16_16_from_double (yc);
vector.vector[2] = 1 << 16;
if (! pixman_transform_point_3d (pixman_transform, &vector))
return;
x = pixman_fixed_to_double (vector.vector[0]);
y = pixman_fixed_to_double (vector.vector[1]);
cairo_matrix_transform_point (&inv, &x, &y);
/* Ideally, the vector should now be (xc, yc).
* We can now compensate for the resulting error.
*/
x -= xc;
y -= yc;
cairo_matrix_transform_distance (matrix, &x, &y);
dx = _cairo_fixed_16_16_from_double (x);
dy = _cairo_fixed_16_16_from_double (y);
pixman_transform->matrix[0][2] -= dx;
pixman_transform->matrix[1][2] -= dy;
if (dx == 0 && dy == 0)
break;
} while (--max_iterations);
}
}
void
_cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
pixman_transform_t *pixman_transform)
{
static const pixman_transform_t pixman_identity_transform = {{
{1 << 16, 0, 0},
{ 0, 1 << 16, 0},
{ 0, 0, 1 << 16}
}};
if (_cairo_matrix_is_identity (matrix)) {
*pixman_transform = pixman_identity_transform;
}
else {
cairo_matrix_t inv = *matrix;
double x = 0, y = 0;
pixman_vector_t vector;
pixman_transform->matrix[0][0] = _cairo_fixed_16_16_from_double (matrix->xx);
pixman_transform->matrix[0][1] = _cairo_fixed_16_16_from_double (matrix->xy);
pixman_transform->matrix[0][2] = _cairo_fixed_16_16_from_double (matrix->x0);
pixman_transform->matrix[1][0] = _cairo_fixed_16_16_from_double (matrix->yx);
pixman_transform->matrix[1][1] = _cairo_fixed_16_16_from_double (matrix->yy);
pixman_transform->matrix[1][2] = _cairo_fixed_16_16_from_double (matrix->y0);
pixman_transform->matrix[2][0] = 0;
pixman_transform->matrix[2][1] = 0;
pixman_transform->matrix[2][2] = 1 << 16;
/* The conversion above breaks cairo's translation invariance:
* a translation of (a, b) in device space translates to
* a translation of (xx * a + xy * b, yx * a + yy * b)
* for cairo, while pixman uses rounded versions of xx ... yy.
* This error increases as a and b get larger.
*
* To compensate for this, we fix the point (0, 0) in pattern
* space and adjust pixman's transform to agree with cairo's at
* that point. */
/* Note: If we can't invert the transformation, skip the adjustment. */
if (cairo_matrix_invert (&inv) != CAIRO_STATUS_SUCCESS)
return;
/* find the device space coordinate that maps to (0, 0) */
cairo_matrix_transform_point (&inv, &x, &y);
/* transform the resulting device space coordinate back
* to the pattern space, using pixman's transform */
vector.vector[0] = _cairo_fixed_16_16_from_double (x);
vector.vector[1] = _cairo_fixed_16_16_from_double (y);
vector.vector[2] = 1 << 16;
if (!pixman_transform_point_3d (pixman_transform, &vector))
return;
/* Ideally, the vector should now be (0, 0). We can now compensate
* for the resulting error */
pixman_transform->matrix[0][2] -= vector.vector[0];
pixman_transform->matrix[1][2] -= vector.vector[1];
}
}
static cairo_int_status_t
_cairo_path_fixed_stroke_rectilinear (cairo_path_fixed_t *path,
cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
cairo_traps_t *traps)
{
cairo_rectilinear_stroker_t rectilinear_stroker;
cairo_int_status_t status;
/* This special-case rectilinear stroker only supports
* miter-joined lines (not curves) and a translation-only matrix
* (though it could probably be extended to support a matrix with
* uniform, integer scaling).
*
* It also only supports horizontal and vertical line_to
* elements. But we don't catch that here, but instead return
* UNSUPPORTED from _cairo_rectilinear_stroker_line_to if any
* non-rectilinear line_to is encountered.
*/
if (path->has_curve_to)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (stroke_style->line_join != CAIRO_LINE_JOIN_MITER)
return CAIRO_INT_STATUS_UNSUPPORTED;
/* If the miter limit turns right angles into bevels, then we
* can't use this optimization. Remember, the ratio is
* 1/sin(ɸ/2). So the cutoff is 1/sin(π/4.0) or ⎷2,
* which we round for safety. */
if (stroke_style->miter_limit < M_SQRT2)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! (stroke_style->line_cap == CAIRO_LINE_CAP_BUTT ||
stroke_style->line_cap == CAIRO_LINE_CAP_SQUARE))
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
if (! (_cairo_matrix_is_identity (ctm) ||
_cairo_matrix_is_translation (ctm)))
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
_cairo_rectilinear_stroker_init (&rectilinear_stroker,
stroke_style,
ctm,
traps);
if (traps->has_limits) {
_cairo_rectilinear_stroker_limit (&rectilinear_stroker,
&traps->limits);
}
status = _cairo_path_fixed_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_rectilinear_stroker_move_to,
rectilinear_stroker.dash.dashed ?
_cairo_rectilinear_stroker_line_to_dashed :
_cairo_rectilinear_stroker_line_to,
NULL,
_cairo_rectilinear_stroker_close_path,
&rectilinear_stroker);
if (unlikely (status))
goto BAIL;
if (rectilinear_stroker.dash.dashed)
status = _cairo_rectilinear_stroker_emit_segments_dashed (&rectilinear_stroker);
else
status = _cairo_rectilinear_stroker_emit_segments (&rectilinear_stroker);
BAIL:
_cairo_rectilinear_stroker_fini (&rectilinear_stroker);
if (unlikely (status))
_cairo_traps_clear (traps);
return status;
}
static inline cairo_bool_t
_cairo_surface_wrapper_needs_device_transform (cairo_surface_wrapper_t *wrapper)
{
return ! _cairo_matrix_is_identity (&wrapper->target->device_transform);
}
static cairo_status_t
_cairo_gl_gradient_operand_init (cairo_gl_operand_t *operand,
const cairo_pattern_t *pattern,
cairo_gl_surface_t *dst,
cairo_bool_t use_texgen)
{
const cairo_gradient_pattern_t *gradient = (const cairo_gradient_pattern_t *)pattern;
cairo_status_t status;
assert (gradient->base.type == CAIRO_PATTERN_TYPE_LINEAR ||
gradient->base.type == CAIRO_PATTERN_TYPE_RADIAL);
if (! _cairo_gl_device_has_glsl (dst->base.device))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_gl_create_gradient_texture (dst,
gradient,
&operand->gradient.gradient);
if (unlikely (status))
return status;
if (gradient->base.type == CAIRO_PATTERN_TYPE_LINEAR) {
cairo_linear_pattern_t *linear = (cairo_linear_pattern_t *) gradient;
double x0, y0, dx, dy, sf, offset;
dx = linear->pd2.x - linear->pd1.x;
dy = linear->pd2.y - linear->pd1.y;
sf = 1.0 / (dx * dx + dy * dy);
dx *= sf;
dy *= sf;
x0 = linear->pd1.x;
y0 = linear->pd1.y;
offset = dx * x0 + dy * y0;
operand->type = CAIRO_GL_OPERAND_LINEAR_GRADIENT;
cairo_matrix_init (&operand->gradient.m, dx, 0, dy, 1, -offset, 0);
if (! _cairo_matrix_is_identity (&pattern->matrix)) {
cairo_matrix_multiply (&operand->gradient.m,
&pattern->matrix,
&operand->gradient.m);
}
} else {
cairo_matrix_t m;
cairo_circle_double_t circles[2];
double x0, y0, r0, dx, dy, dr;
/*
* Some fragment shader implementations use half-floats to
* represent numbers, so the maximum number they can represent
* is about 2^14. Some intermediate computations used in the
* radial gradient shaders can produce results of up to 2*k^4.
* Setting k=8 makes the maximum result about 8192 (assuming
* that the extreme circles are not much smaller than the
* destination image).
*/
_cairo_gradient_pattern_fit_to_range (gradient, 8.,
&operand->gradient.m, circles);
x0 = circles[0].center.x;
y0 = circles[0].center.y;
r0 = circles[0].radius;
dx = circles[1].center.x - x0;
dy = circles[1].center.y - y0;
dr = circles[1].radius - r0;
operand->gradient.a = dx * dx + dy * dy - dr * dr;
operand->gradient.radius_0 = r0;
operand->gradient.circle_d.center.x = dx;
operand->gradient.circle_d.center.y = dy;
operand->gradient.circle_d.radius = dr;
if (operand->gradient.a == 0)
operand->type = CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0;
else if (pattern->extend == CAIRO_EXTEND_NONE)
operand->type = CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE;
else
operand->type = CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT;
cairo_matrix_init_translate (&m, -x0, -y0);
cairo_matrix_multiply (&operand->gradient.m,
&operand->gradient.m,
&m);
}
operand->gradient.extend = pattern->extend;
operand->gradient.texgen = use_texgen;
return CAIRO_STATUS_SUCCESS;
}
static SkShader*
source_to_sk_shader (cairo_skia_context_t *cr,
const cairo_pattern_t *pattern)
{
SkShader *shader = NULL;
if (pattern->type == CAIRO_PATTERN_TYPE_SOLID) {
cairo_solid_pattern_t *solid = (cairo_solid_pattern_t *) pattern;
return new SkColorShader (color_to_sk (solid->color));
} else if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_t *surface = surface_from_pattern (pattern);
cr->source = cairo_surface_reference (surface);
if (surface->type == CAIRO_SURFACE_TYPE_SKIA) {
cairo_skia_surface_t *esurf = (cairo_skia_surface_t *) surface;
shader = SkShader::CreateBitmapShader (*esurf->bitmap,
extend_to_sk (pattern->extend),
extend_to_sk (pattern->extend));
} else {
SkBitmap bitmap;
if (! _cairo_surface_is_image (surface)) {
cairo_status_t status;
status = _cairo_surface_acquire_source_image (surface,
&cr->source_image,
&cr->source_extra);
if (status)
return NULL;
surface = &cr->source_image->base;
}
if (unlikely (! surface_to_sk_bitmap (surface, bitmap)))
return NULL;
shader = SkShader::CreateBitmapShader (bitmap,
extend_to_sk (pattern->extend),
extend_to_sk (pattern->extend));
}
} else if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR
/* || pattern->type == CAIRO_PATTERN_TYPE_RADIAL */)
{
cairo_gradient_pattern_t *gradient = (cairo_gradient_pattern_t *) pattern;
SkColor colors_stack[10];
SkScalar pos_stack[10];
SkColor *colors = colors_stack;
SkScalar *pos = pos_stack;
if (gradient->n_stops > 10) {
colors = new SkColor[gradient->n_stops];
pos = new SkScalar[gradient->n_stops];
}
for (unsigned int i = 0; i < gradient->n_stops; i++) {
pos[i] = CAIRO_FIXED_TO_SK_SCALAR (gradient->stops[i].offset);
colors[i] = color_stop_to_sk (gradient->stops[i].color);
}
if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR) {
cairo_linear_pattern_t *linear = (cairo_linear_pattern_t *) gradient;
SkPoint points[2];
points[0].set (SkFloatToScalar (linear->pd1.x),
SkFloatToScalar (linear->pd1.y));
points[1].set (SkFloatToScalar (linear->pd2.x),
SkFloatToScalar (linear->pd2.y));
shader = SkGradientShader::CreateLinear (points, colors, pos, gradient->n_stops,
extend_to_sk (pattern->extend));
} else {
// XXX todo -- implement real radial shaders in Skia
}
if (gradient->n_stops > 10) {
delete [] colors;
delete [] pos;
}
}
if (shader && ! _cairo_matrix_is_identity (&pattern->matrix))
shader->setLocalMatrix (matrix_inverse_to_sk (pattern->matrix));
return shader;
}
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));
}
}