Rect
Region::GetExtents ()
{
cairo_rectangle_int_t extents;
cairo_region_get_extents (cairo_region, &extents);
return Rect (extents.x, extents.y, extents.width, extents.height);
}
static cairo_surface_t *
ensure_image_surface (cairo_surface_t *surface, const cairo_region_t *region)
{
cairo_rectangle_int_t extents;
cairo_surface_t *image;
cairo_t *cr;
int i, num_rects;
if (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE)
return surface;
cairo_region_get_extents (region, &extents);
image = cairo_image_surface_create (CAIRO_FORMAT_RGB24, extents.width, extents.height);
cairo_surface_set_device_offset (image, -extents.x, -extents.y);
cr = cairo_create (image);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
num_rects = cairo_region_num_rectangles (region);
for (i = 0; i < num_rects; i++) {
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rect);
cairo_rectangle (cr, rect.x, rect.y,
rect.width, rect.height);
}
cairo_fill (cr);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return image;
}
// cairo_public void
// cairo_region_get_extents (const cairo_region_t *region,
// cairo_rectangle_int_t *extents);
static int l_cairo_region_get_extents (lua_State* L)
{
const cairo_region_t *region = get_cairo_region_t (L, 1);
cairo_rectangle_int_t *extents = get_cairo_rectangle_int_t (L, 2);
cairo_region_get_extents (region, extents);
return 0;
}
bool wxRegion::DoGetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
{
if ( m_refData )
{
GdkRectangle rect;
#ifdef __WXGTK3__
cairo_region_get_extents(M_REGIONDATA->m_region, &rect);
#else
gdk_region_get_clipbox( M_REGIONDATA->m_region, &rect );
#endif
x = rect.x;
y = rect.y;
w = rect.width;
h = rect.height;
return true;
}
else
{
x = 0;
y = 0;
w = -1;
h = -1;
return false;
}
}
static gboolean
pgd_selections_drawing_area_query_tooltip (GtkWidget *area,
gint x,
gint y,
gboolean keyboard_mode,
GtkTooltip *tooltip,
PgdSelectionsDemo *demo)
{
gboolean over_selection;
if (!demo->selected_text)
return FALSE;
over_selection = cairo_region_contains_point (demo->selected_region,
x / demo->scale,
y / demo->scale);
if (over_selection) {
GdkRectangle selection_area;
cairo_region_get_extents (demo->selected_region,
(cairo_rectangle_int_t *)&selection_area);
selection_area.x *= demo->scale;
selection_area.y *= demo->scale;
selection_area.width *= demo->scale;
selection_area.height *= demo->scale;
gtk_tooltip_set_text (tooltip, demo->selected_text);
gtk_tooltip_set_tip_area (tooltip, &selection_area);
return TRUE;
}
return FALSE;
}
gboolean
byzanz_serialize (GOutputStream * stream,
guint64 msecs,
cairo_surface_t * surface,
const cairo_region_t * region,
GCancellable * cancellable,
GError ** error)
{
guint i, stride;
cairo_rectangle_int_t rect, extents;
guchar *data;
guint32 n;
int y, n_rects;
g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
g_return_val_if_fail ((surface == NULL) == (region == NULL), FALSE);
g_return_val_if_fail (region == NULL || !cairo_region_is_empty (region), FALSE);
if (!g_output_stream_write_all (stream, &msecs, sizeof (guint64), NULL, cancellable, error))
return FALSE;
if (surface == 0) {
n = 0;
return g_output_stream_write_all (stream, &n, sizeof (guint32), NULL, cancellable, error);
}
n = n_rects = cairo_region_num_rectangles (region);
if (!g_output_stream_write_all (stream, &n, sizeof (guint32), NULL, cancellable, error))
return FALSE;
for (i = 0; i < n; i++) {
gint32 ints[4];
cairo_region_get_rectangle (region, i, &rect);
ints[0] = rect.x, ints[1] = rect.y, ints[2] = rect.width, ints[3] = rect.height;
g_assert (sizeof (ints) == 16);
if (!g_output_stream_write_all (stream, ints, sizeof (ints), NULL, cancellable, error))
return FALSE;
}
stride = cairo_image_surface_get_stride (surface);
cairo_region_get_extents (region, &extents);
for (i = 0; i < n; i++) {
cairo_region_get_rectangle (region, i, &rect);
data = cairo_image_surface_get_data (surface)
+ stride * (rect.y - extents.y)
+ sizeof (guint32) * (rect.x - extents.x);
for (y = 0; y < rect.height; y++) {
if (!g_output_stream_write_all (G_OUTPUT_STREAM (stream), data,
rect.width * sizeof (guint32), NULL, cancellable, error))
return FALSE;
data += stride;
}
}
return TRUE;
}
/* This computes a (clipped version) of the inverse of the region
* and expands it by the given amount */
static cairo_region_t *
expand_region_inverse (cairo_region_t *region,
int x_amount,
int y_amount,
gboolean flip)
{
MetaRegionBuilder builder;
MetaRegionIterator iter;
cairo_rectangle_int_t extents;
int last_x;
meta_region_builder_init (&builder);
cairo_region_get_extents (region, &extents);
add_expanded_rect (&builder,
extents.x, extents.y - 1, extents.width, 1,
x_amount, y_amount, flip);
add_expanded_rect (&builder,
extents.x - 1, extents.y, 1, extents.height,
x_amount, y_amount, flip);
add_expanded_rect (&builder,
extents.x + extents.width, extents.y, 1, extents.height,
x_amount, y_amount, flip);
add_expanded_rect (&builder,
extents.x, extents.y + extents.height, extents.width, 1,
x_amount, y_amount, flip);
last_x = extents.x;
for (meta_region_iterator_init (&iter, region);
!meta_region_iterator_at_end (&iter);
meta_region_iterator_next (&iter))
{
if (iter.rectangle.x > last_x)
add_expanded_rect (&builder,
last_x, iter.rectangle.y,
iter.rectangle.x - last_x, iter.rectangle.height,
x_amount, y_amount, flip);
if (iter.line_end)
{
if (extents.x + extents.width > iter.rectangle.x + iter.rectangle.width)
add_expanded_rect (&builder,
iter.rectangle.x + iter.rectangle.width, iter.rectangle.y,
(extents.x + extents.width) - (iter.rectangle.x + iter.rectangle.width), iter.rectangle.height,
x_amount, y_amount, flip);
last_x = extents.x;
}
else
last_x = iter.rectangle.x + iter.rectangle.width;
}
return meta_region_builder_finish (&builder);
}
static cairo_surface_t *
byzanz_recorder_create_snapshot (ByzanzRecorder *recorder, const cairo_region_t *invalid)
{
cairo_rectangle_int_t extents;
cairo_surface_t *surface;
cairo_t *cr;
GSequenceIter *iter;
int i, num_rects;
cairo_region_get_extents (invalid, &extents);
cr = gdk_cairo_create (recorder->window);
surface = cairo_surface_create_similar (cairo_get_target (cr), CAIRO_CONTENT_COLOR,
extents.width, extents.height);
cairo_destroy (cr);
cairo_surface_set_device_offset (surface, -extents.x, -extents.y);
cr = cairo_create (surface);
num_rects = cairo_region_num_rectangles (invalid);
for (i = 0; i < num_rects; i++) {
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (invalid, i, &rect);
cairo_rectangle (cr, rect.x, rect.y,
rect.width, rect.height);
}
cairo_clip (cr);
for (iter = g_sequence_get_begin_iter (recorder->layers);
!g_sequence_iter_is_end (iter);
iter = g_sequence_iter_next (iter)) {
ByzanzLayer *layer = g_sequence_get (iter);
ByzanzLayerClass *klass = BYZANZ_LAYER_GET_CLASS (layer);
cairo_save (cr);
klass->render (layer, cr);
if (cairo_status (cr))
g_critical ("error capturing image: %s", cairo_status_to_string (cairo_status (cr)));
cairo_restore (cr);
}
cairo_destroy (cr);
surface = ensure_image_surface (surface, invalid);
/* adjust device offset here - the layers work in GdkScreen coordinates, the rest
* of the code works in coordinates realtive to the passed in area. */
cairo_surface_set_device_offset (surface,
recorder->area.x - extents.x, recorder->area.y - extents.y);
return surface;
}
gboolean draw(gpointer data) {
if (cairo_region_is_empty(lualock.updates_needed))
return TRUE;
cairo_rectangle_int_t extents;
cairo_region_get_extents(lualock.updates_needed, &extents);
cairo_t *cr = cairo_create(lualock.surface_buf);
cairo_rectangle(cr, extents.x, extents.y, extents.width, extents.height);
cairo_clip(cr);
cairo_set_source_rgba(cr, 0, 0, 0, 0);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_set_source_surface(cr, lualock.bg_surface, 0, 0);
cairo_paint(cr);
for (guint i = 0; i < lualock.layers->len; i++) {
layer_t *layer = g_ptr_array_index(lualock.layers, i);
if (!layer->show)
continue;
cairo_save(cr);
cairo_translate(cr, layer->x, layer->y);
cairo_scale(cr, layer->scale_x, layer->scale_y);
cairo_rotate(cr, layer->angle);
cairo_set_source_surface(cr, layer->surface, 0, 0);
cairo_paint(cr);
cairo_restore(cr);
}
draw_password_mask();
cairo_translate(cr, lualock.style.x, lualock.style.y);
cairo_set_source_surface(cr, lualock.pw_surface, 0, 0);
cairo_paint(cr);
cairo_destroy(cr);
cairo_t *crw = gdk_cairo_create(lualock.win);
cairo_set_source_surface(crw, lualock.surface_buf, 0, 0);
cairo_set_operator(crw, CAIRO_OPERATOR_SOURCE);
cairo_paint(crw);
cairo_destroy(crw);
clear_updates();
return TRUE;
}
IntRect getPangoRegionExtents(PangoRegionType region)
{
cairo_rectangle_int_t rectangle;
cairo_region_get_extents(region, &rectangle);
return IntRect(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
}
cairo_status_t
_cairo_win32_display_surface_set_clip (cairo_win32_display_surface_t *surface,
cairo_clip_t *clip)
{
char stack[512];
cairo_rectangle_int_t extents;
int num_rects;
RGNDATA *data;
size_t data_size;
RECT *rects;
int i;
HRGN gdi_region;
cairo_status_t status;
cairo_region_t *region;
/* The semantics we want is that any clip set by cairo combines
* is intersected with the clip on device context that the
* surface was created for. To implement this, we need to
* save the original clip when first setting a clip on surface.
*/
assert (_cairo_clip_is_region (clip));
region = _cairo_clip_get_region (clip);
if (region == NULL)
return CAIRO_STATUS_SUCCESS;
cairo_region_get_extents (region, &extents);
num_rects = cairo_region_num_rectangles (region);
/* XXX see notes in _cairo_win32_save_initial_clip --
* this code will interact badly with a HDC which had an initial
* world transform -- we should probably manually transform the
* region rects, because SelectClipRgn takes device units, not
* logical units (unlike IntersectClipRect).
*/
data_size = sizeof (RGNDATAHEADER) + num_rects * sizeof (RECT);
if (data_size > sizeof (stack)) {
data = malloc (data_size);
if (!data)
return _cairo_error(CAIRO_STATUS_NO_MEMORY);
} else
data = (RGNDATA *)stack;
data->rdh.dwSize = sizeof (RGNDATAHEADER);
data->rdh.iType = RDH_RECTANGLES;
data->rdh.nCount = num_rects;
data->rdh.nRgnSize = num_rects * sizeof (RECT);
data->rdh.rcBound.left = extents.x;
data->rdh.rcBound.top = extents.y;
data->rdh.rcBound.right = extents.x + extents.width;
data->rdh.rcBound.bottom = extents.y + extents.height;
rects = (RECT *)data->Buffer;
for (i = 0; i < num_rects; i++) {
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rect);
rects[i].left = rect.x;
rects[i].top = rect.y;
rects[i].right = rect.x + rect.width;
rects[i].bottom = rect.y + rect.height;
}
gdi_region = ExtCreateRegion (NULL, data_size, data);
if ((char *)data != stack)
free (data);
if (!gdi_region)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
/* AND the new region into our DC */
status = CAIRO_STATUS_SUCCESS;
if (ExtSelectClipRgn (surface->win32.dc, gdi_region, RGN_AND) == ERROR)
status = _cairo_win32_print_gdi_error (__FUNCTION__);
DeleteObject (gdi_region);
return status;
}
/* Warning: This call modifies the coordinates of traps */
static cairo_status_t
_clip_and_composite_trapezoids (const cairo_pattern_t *src,
cairo_operator_t op,
cairo_surface_t *dst,
cairo_traps_t *traps,
cairo_clip_t *clip,
cairo_antialias_t antialias)
{
cairo_status_t status;
cairo_region_t *trap_region = NULL;
cairo_region_t *clear_region = NULL;
cairo_rectangle_int_t extents;
cairo_composite_traps_info_t traps_info;
if (_cairo_operator_bounded_by_mask (op) && traps->num_traps == 0)
return CAIRO_STATUS_SUCCESS;
status = _cairo_surface_get_extents (dst, &extents);
if (unlikely (status))
return status;
status = _cairo_traps_extract_region (traps, &trap_region);
if (status && status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
if (_cairo_operator_bounded_by_mask (op)) {
cairo_rectangle_int_t trap_extents;
if (trap_region) {
status = _cairo_clip_intersect_to_region (clip, trap_region);
if (unlikely (status))
goto out;
cairo_region_get_extents (trap_region, &trap_extents);
} else {
cairo_box_t trap_box;
_cairo_traps_extents (traps, &trap_box);
_cairo_box_round_to_rectangle (&trap_box, &trap_extents);
}
if (! _cairo_rectangle_intersect (&extents, &trap_extents)) {
status = CAIRO_STATUS_SUCCESS;
goto out;
}
status = _cairo_clip_intersect_to_rectangle (clip, &extents);
if (unlikely (status))
goto out;
} else {
cairo_surface_t *clip_surface = clip ? clip->surface : NULL;
if (trap_region && !clip_surface) {
/* If we optimize drawing with an unbounded operator to
* _cairo_surface_fill_rectangles() or to drawing with a
* clip region, then we have an additional region to clear.
*/
clear_region = cairo_region_create_rectangle (&extents);
status = cairo_region_status (clear_region);
if (unlikely (status))
goto out;
status = _cairo_clip_intersect_to_region (clip, clear_region);
if (unlikely (status))
goto out;
cairo_region_get_extents (clear_region, &extents);
status = cairo_region_subtract (clear_region, trap_region);
if (unlikely (status))
goto out;
if (cairo_region_is_empty (clear_region)) {
cairo_region_destroy (clear_region);
clear_region = NULL;
}
} else {
status = _cairo_clip_intersect_to_rectangle (clip, &extents);
}
}
if (unlikely (status))
goto out;
if (trap_region) {
cairo_surface_t *clip_surface = clip ? clip->surface : NULL;
if ((src->type == CAIRO_PATTERN_TYPE_SOLID ||
op == CAIRO_OPERATOR_CLEAR) && !clip_surface) {
const cairo_color_t *color;
if (op == CAIRO_OPERATOR_CLEAR) {
color = CAIRO_COLOR_TRANSPARENT;
} else {
color = &((cairo_solid_pattern_t *)src)->color;
}
/* Solid rectangles special case */
status = _cairo_surface_fill_region (dst, op, color, trap_region);
if (!status && clear_region) {
status = _cairo_surface_fill_region (dst, CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
clear_region);
}
goto out;
}
if ((_cairo_operator_bounded_by_mask (op) &&
op != CAIRO_OPERATOR_SOURCE) || !clip_surface) {
/* For a simple rectangle, we can just use composite(), for more
* rectangles, we have to set a clip region. The cost of rasterizing
* trapezoids is pretty high for most backends currently, so it's
* worthwhile even if a region is needed.
*
* If we have a clip surface, we set it as the mask; this only works
* for bounded operators other than SOURCE; for unbounded operators,
* clip and mask cannot be interchanged. For SOURCE, the operator
* as implemented by the backends is different in its handling
* of the mask then what we want.
*
* CAIRO_INT_STATUS_UNSUPPORTED will be returned if the region has
* more than rectangle and the destination doesn't support clip
* regions. In that case, we fall through.
*/
status = _composite_trap_region (clip, src, op, dst,
trap_region, &extents);
if (status != CAIRO_INT_STATUS_UNSUPPORTED) {
if (!status && clear_region)
status = _cairo_surface_fill_region (dst, CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
clear_region);
goto out;
}
}
}
traps_info.traps = traps;
traps_info.antialias = antialias;
status = _clip_and_composite (clip, op, src,
_composite_traps_draw_func,
&traps_info, dst, &extents);
out:
if (trap_region)
cairo_region_destroy (trap_region);
if (clear_region)
cairo_region_destroy (clear_region);
return status;
}
static void
make_shadow (MetaShadow *shadow,
cairo_region_t *region)
{
int d = get_box_filter_size (shadow->key.radius);
int spread = get_shadow_spread (shadow->key.radius);
cairo_rectangle_int_t extents;
cairo_region_t *row_convolve_region;
cairo_region_t *column_convolve_region;
guchar *buffer;
int buffer_width;
int buffer_height;
int x_offset;
int y_offset;
int n_rectangles, j, k;
cairo_region_get_extents (region, &extents);
/* In the case where top_fade >= 0 and the portion above the top
* edge of the shape will be cropped, it seems like we could create
* a smaller buffer and omit the top portion, but actually, in our
* multi-pass blur algorithm, the blur into the area above the window
* in the first pass will contribute back to the final pixel values
* for the top pixels, so we create a buffer as if we weren't cropping
* and only crop when creating the CoglTexture.
*/
buffer_width = extents.width + 2 * spread;
buffer_height = extents.height + 2 * spread;
/* Round up so we have aligned rows/columns */
buffer_width = (buffer_width + 3) & ~3;
buffer_height = (buffer_height + 3) & ~3;
/* Square buffer allows in-place swaps, which are roughly 70% faster, but we
* don't want to over-allocate too much memory.
*/
if (buffer_height < buffer_width && buffer_height > (3 * buffer_width) / 4)
buffer_height = buffer_width;
if (buffer_width < buffer_height && buffer_width > (3 * buffer_height) / 4)
buffer_width = buffer_height;
buffer = g_malloc0 (buffer_width * buffer_height);
/* Blurring with multiple box-blur passes is fast, but (especially for
* large shadow sizes) we can improve efficiency by restricting the blur
* to the region that actually needs to be blurred.
*/
row_convolve_region = meta_make_border_region (region, spread, spread, FALSE);
column_convolve_region = meta_make_border_region (region, 0, spread, TRUE);
/* Offsets between coordinates of the regions and coordinates in the buffer */
x_offset = spread;
y_offset = spread;
/* Step 1: unblurred image */
n_rectangles = cairo_region_num_rectangles (region);
for (k = 0; k < n_rectangles; k++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, k, &rect);
for (j = y_offset + rect.y; j < y_offset + rect.y + rect.height; j++)
memset (buffer + buffer_width * j + x_offset + rect.x, 255, rect.width);
}
/* Step 2: swap rows and columns */
buffer = flip_buffer (buffer, buffer_width, buffer_height);
/* Step 3: blur rows (really columns) */
blur_rows (column_convolve_region, y_offset, x_offset,
buffer, buffer_height, buffer_width,
d);
/* Step 4: swap rows and columns */
buffer = flip_buffer (buffer, buffer_height, buffer_width);
/* Step 5: blur rows */
blur_rows (row_convolve_region, x_offset, y_offset,
buffer, buffer_width, buffer_height,
d);
/* Step 6: fade out the top, if applicable */
if (shadow->key.top_fade >= 0)
{
for (j = y_offset; j < y_offset + MIN (shadow->key.top_fade, extents.height + shadow->outer_border_bottom); j++)
fade_bytes(buffer + j * buffer_width, buffer_width, j - y_offset, shadow->key.top_fade);
}
/* We offset the passed in pixels to crop off the extra area we allocated at the top
* in the case of top_fade >= 0. We also account for padding at the left for symmetry
* though that doesn't currently occur.
*/
shadow->texture = cogl_texture_new_from_data (shadow->outer_border_left + extents.width + shadow->outer_border_right,
shadow->outer_border_top + extents.height + shadow->outer_border_bottom,
COGL_TEXTURE_NONE,
COGL_PIXEL_FORMAT_A_8,
COGL_PIXEL_FORMAT_ANY,
buffer_width,
(buffer +
(y_offset - shadow->outer_border_top) * buffer_width +
(x_offset - shadow->outer_border_left)));
cairo_region_destroy (row_convolve_region);
cairo_region_destroy (column_convolve_region);
g_free (buffer);
shadow->material = meta_create_texture_material (shadow->texture);
}
gboolean
byzanz_deserialize (GInputStream * stream,
guint64 * msecs_out,
cairo_surface_t ** surface_out,
cairo_region_t ** region_out,
GCancellable * cancellable,
GError ** error)
{
guint i, stride;
cairo_rectangle_int_t extents, *rects;
cairo_region_t *region;
cairo_surface_t *surface;
guchar *data;
guint32 n;
int y;
g_return_val_if_fail (G_IS_INPUT_STREAM (stream), FALSE);
g_return_val_if_fail (msecs_out != NULL, FALSE);
g_return_val_if_fail (surface_out != NULL, FALSE);
g_return_val_if_fail (region_out != NULL, FALSE);
if (!g_input_stream_read_all (stream, msecs_out, sizeof (guint64), NULL, cancellable, error) ||
!g_input_stream_read_all (stream, &n, sizeof (guint32), NULL, cancellable, error))
return FALSE;
if (n == 0) {
/* end of stream */
*surface_out = NULL;
*region_out = NULL;
return TRUE;
}
region = cairo_region_create ();
rects = g_new (cairo_rectangle_int_t, n);
surface = NULL;
for (i = 0; i < n; i++) {
gint ints[4];
if (!g_input_stream_read_all (stream, ints, sizeof (ints), NULL, cancellable, error))
goto fail;
rects[i].x = ints[0];
rects[i].y = ints[1];
rects[i].width = ints[2];
rects[i].height = ints[3];
cairo_region_union_rectangle (region, &rects[i]);
}
cairo_region_get_extents (region, &extents);
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, extents.width, extents.height);
cairo_surface_set_device_offset (surface, -extents.x, -extents.y);
stride = cairo_image_surface_get_stride (surface);
for (i = 0; i < n; i++) {
data = cairo_image_surface_get_data (surface)
+ stride * (rects[i].y - extents.y)
+ sizeof (guint32) * (rects[i].x - extents.x);
for (y = 0; y < rects[i].height; y++) {
if (!g_input_stream_read_all (stream, data,
rects[i].width * sizeof (guint32), NULL, cancellable, error))
goto fail;
data += stride;
}
}
g_free (rects);
*region_out = region;
*surface_out = surface;
return TRUE;
fail:
if (surface)
cairo_surface_destroy (surface);
cairo_region_destroy (region);
g_free (rects);
return FALSE;
}
/**
* gdk_cairo_draw_from_gl:
* @cr: a cairo context
* @window: The window we're rendering for (not necessarily into)
* @source: The GL ID of the source buffer
* @source_type: The type of the @source
* @buffer_scale: The scale-factor that the @source buffer is allocated for
* @x: The source x position in @source to start copying from in GL coordinates
* @y: The source y position in @source to start copying from in GL coordinates
* @width: The width of the region to draw
* @height: The height of the region to draw
*
* This is the main way to draw GL content in GTK+. It takes a render buffer ID
* (@source_type == #GL_RENDERBUFFER) or a texture id (@source_type == #GL_TEXTURE)
* and draws it onto @cr with an OVER operation, respecting the current clip.
* The top left corner of the rectangle specified by @x, @y, @width and @height
* will be drawn at the current (0,0) position of the cairo_t.
*
* This will work for *all* cairo_t, as long as @window is realized, but the
* fallback implementation that reads back the pixels from the buffer may be
* used in the general case. In the case of direct drawing to a window with
* no special effects applied to @cr it will however use a more efficient
* approach.
*
* For #GL_RENDERBUFFER the code will always fall back to software for buffers
* with alpha components, so make sure you use #GL_TEXTURE if using alpha.
*
* Calling this may change the current GL context.
*
* Since: 3.16
*/
void
gdk_cairo_draw_from_gl (cairo_t *cr,
GdkWindow *window,
int source,
int source_type,
int buffer_scale,
int x,
int y,
int width,
int height)
{
GdkGLContext *paint_context;
cairo_surface_t *image;
cairo_matrix_t matrix;
int dx, dy, window_scale;
gboolean trivial_transform;
cairo_surface_t *group_target;
GdkWindow *direct_window, *impl_window;
guint framebuffer;
int alpha_size = 0;
cairo_region_t *clip_region;
GdkGLContextPaintData *paint_data;
impl_window = window->impl_window;
window_scale = gdk_window_get_scale_factor (impl_window);
paint_context = gdk_window_get_paint_gl_context (window, NULL);
if (paint_context == NULL)
{
g_warning ("gdk_cairo_draw_gl_render_buffer failed - no paint context");
return;
}
clip_region = gdk_cairo_region_from_clip (cr);
gdk_gl_context_make_current (paint_context);
paint_data = gdk_gl_context_get_paint_data (paint_context);
if (paint_data->tmp_framebuffer == 0)
glGenFramebuffersEXT (1, &paint_data->tmp_framebuffer);
if (source_type == GL_RENDERBUFFER)
{
glBindRenderbuffer (GL_RENDERBUFFER, source);
glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_ALPHA_SIZE, &alpha_size);
}
else if (source_type == GL_TEXTURE)
{
glBindTexture (GL_TEXTURE_2D, source);
glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &alpha_size);
}
else
{
g_warning ("Unsupported gl source type %d\n", source_type);
return;
}
group_target = cairo_get_group_target (cr);
direct_window = cairo_surface_get_user_data (group_target, &direct_key);
cairo_get_matrix (cr, &matrix);
dx = matrix.x0;
dy = matrix.y0;
/* Trivial == integer-only translation */
trivial_transform =
(double)dx == matrix.x0 && (double)dy == matrix.y0 &&
matrix.xx == 1.0 && matrix.xy == 0.0 &&
matrix.yx == 0.0 && matrix.yy == 1.0;
/* For direct paint of non-alpha renderbuffer, we can
just do a bitblit */
if ((_gdk_gl_flags & GDK_GL_SOFTWARE_DRAW_GL) == 0 &&
source_type == GL_RENDERBUFFER &&
alpha_size == 0 &&
direct_window != NULL &&
direct_window->current_paint.use_gl &&
trivial_transform &&
clip_region != NULL)
{
int unscaled_window_height;
int i;
/* Create a framebuffer with the source renderbuffer and
make it the current target for reads */
framebuffer = paint_data->tmp_framebuffer;
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, framebuffer);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, source);
glBindFramebufferEXT (GL_DRAW_FRAMEBUFFER_EXT, 0);
/* Translate to impl coords */
cairo_region_translate (clip_region, dx, dy);
glEnable (GL_SCISSOR_TEST);
gdk_window_get_unscaled_size (impl_window, NULL, &unscaled_window_height);
glDrawBuffer (GL_BACK);
#define FLIP_Y(_y) (unscaled_window_height - (_y))
for (i = 0; i < cairo_region_num_rectangles (clip_region); i++)
{
cairo_rectangle_int_t clip_rect, dest;
cairo_region_get_rectangle (clip_region, i, &clip_rect);
clip_rect.x *= window_scale;
clip_rect.y *= window_scale;
clip_rect.width *= window_scale;
clip_rect.height *= window_scale;
glScissor (clip_rect.x, FLIP_Y (clip_rect.y + clip_rect.height),
clip_rect.width, clip_rect.height);
dest.x = dx * window_scale;
dest.y = dy * window_scale;
dest.width = width * window_scale / buffer_scale;
dest.height = height * window_scale / buffer_scale;
if (gdk_rectangle_intersect (&clip_rect, &dest, &dest))
{
int clipped_src_x = x + (dest.x - dx * window_scale);
int clipped_src_y = y + (height - dest.height - (dest.y - dy * window_scale));
glBlitFramebufferEXT(clipped_src_x, clipped_src_y,
(clipped_src_x + dest.width), (clipped_src_y + dest.height),
dest.x, FLIP_Y(dest.y + dest.height),
dest.x + dest.width, FLIP_Y(dest.y),
GL_COLOR_BUFFER_BIT, GL_NEAREST);
if (impl_window->current_paint.flushed_region)
{
cairo_rectangle_int_t flushed_rect;
flushed_rect.x = dest.x / window_scale;
flushed_rect.y = dest.y / window_scale;
flushed_rect.width = (dest.x + dest.width + window_scale - 1) / window_scale - flushed_rect.x;
flushed_rect.height = (dest.y + dest.height + window_scale - 1) / window_scale - flushed_rect.y;
cairo_region_union_rectangle (impl_window->current_paint.flushed_region,
&flushed_rect);
cairo_region_subtract_rectangle (impl_window->current_paint.need_blend_region,
&flushed_rect);
}
}
}
glDisable (GL_SCISSOR_TEST);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
#undef FLIP_Y
}
/* For direct paint of alpha or non-alpha textures we can use texturing */
else if ((_gdk_gl_flags & GDK_GL_SOFTWARE_DRAW_GL) == 0 &&
source_type == GL_TEXTURE &&
direct_window != NULL &&
direct_window->current_paint.use_gl &&
trivial_transform &&
clip_region != NULL)
{
int unscaled_window_height;
GLint texture_width;
GLint texture_height;
int i, n_rects, n_quads;
GdkTexturedQuad *quads;
cairo_rectangle_int_t clip_rect;
/* Translate to impl coords */
cairo_region_translate (clip_region, dx, dy);
if (alpha_size != 0)
{
cairo_region_t *opaque_region, *blend_region;
opaque_region = cairo_region_copy (clip_region);
cairo_region_subtract (opaque_region, impl_window->current_paint.flushed_region);
cairo_region_subtract (opaque_region, impl_window->current_paint.need_blend_region);
if (!cairo_region_is_empty (opaque_region))
gdk_gl_texture_from_surface (impl_window->current_paint.surface,
opaque_region);
blend_region = cairo_region_copy (clip_region);
cairo_region_intersect (blend_region, impl_window->current_paint.need_blend_region);
glEnable (GL_BLEND);
if (!cairo_region_is_empty (blend_region))
gdk_gl_texture_from_surface (impl_window->current_paint.surface,
blend_region);
cairo_region_destroy (opaque_region);
cairo_region_destroy (blend_region);
}
glBindTexture (GL_TEXTURE_2D, source);
glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &texture_width);
glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &texture_height);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnable (GL_SCISSOR_TEST);
gdk_window_get_unscaled_size (impl_window, NULL, &unscaled_window_height);
#define FLIP_Y(_y) (unscaled_window_height - (_y))
cairo_region_get_extents (clip_region, &clip_rect);
glScissor (clip_rect.x * window_scale, FLIP_Y ((clip_rect.y + clip_rect.height) * window_scale),
clip_rect.width * window_scale, clip_rect.height * window_scale);
n_quads = 0;
n_rects = cairo_region_num_rectangles (clip_region);
quads = g_new (GdkTexturedQuad, n_rects);
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t dest;
cairo_region_get_rectangle (clip_region, i, &clip_rect);
clip_rect.x *= window_scale;
clip_rect.y *= window_scale;
clip_rect.width *= window_scale;
clip_rect.height *= window_scale;
dest.x = dx * window_scale;
dest.y = dy * window_scale;
dest.width = width * window_scale / buffer_scale;
dest.height = height * window_scale / buffer_scale;
if (gdk_rectangle_intersect (&clip_rect, &dest, &dest))
{
int clipped_src_x = x + (dest.x - dx * window_scale);
int clipped_src_y = y + (height - dest.height - (dest.y - dy * window_scale));
GdkTexturedQuad quad = {
dest.x, FLIP_Y(dest.y),
dest.x + dest.width, FLIP_Y(dest.y + dest.height),
clipped_src_x / (float)texture_width, (clipped_src_y + dest.height) / (float)texture_height,
(clipped_src_x + dest.width) / (float)texture_width, clipped_src_y / (float)texture_height,
};
quads[n_quads++] = quad;
if (impl_window->current_paint.flushed_region)
{
cairo_rectangle_int_t flushed_rect;
flushed_rect.x = dest.x / window_scale;
flushed_rect.y = dest.y / window_scale;
flushed_rect.width = (dest.x + dest.width + window_scale - 1) / window_scale - flushed_rect.x;
flushed_rect.height = (dest.y + dest.height + window_scale - 1) / window_scale - flushed_rect.y;
cairo_region_union_rectangle (impl_window->current_paint.flushed_region,
&flushed_rect);
cairo_region_subtract_rectangle (impl_window->current_paint.need_blend_region,
&flushed_rect);
}
}
}
if (n_quads > 0)
gdk_gl_texture_quads (paint_context, GL_TEXTURE_2D, n_quads, quads);
g_free (quads);
if (alpha_size != 0)
glDisable (GL_BLEND);
#undef FLIP_Y
}
else
{
/* Software fallback */
/* TODO: avoid reading back non-required data due to dest clip */
image = cairo_surface_create_similar_image (cairo_get_target (cr),
(alpha_size == 0) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32,
width, height);
cairo_surface_set_device_scale (image, buffer_scale, buffer_scale);
framebuffer = paint_data->tmp_framebuffer;
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, framebuffer);
if (source_type == GL_RENDERBUFFER)
{
/* Create a framebuffer with the source renderbuffer and
make it the current target for reads */
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, source);
}
else
{
glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, source, 0);
}
glPixelStorei (GL_PACK_ALIGNMENT, 4);
glPixelStorei (GL_PACK_ROW_LENGTH, cairo_image_surface_get_stride (image) / 4);
glReadPixels (x, y, width, height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
cairo_image_surface_get_data (image));
glPixelStorei (GL_PACK_ROW_LENGTH, 0);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
cairo_surface_mark_dirty (image);
/* Invert due to opengl having different origin */
cairo_scale (cr, 1, -1);
cairo_translate (cr, 0, -height / buffer_scale);
cairo_set_source_surface (cr, image, 0, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_paint (cr);
cairo_surface_destroy (image);
}
if (clip_region)
cairo_region_destroy (clip_region);
}
