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gimp/app/widgets/gimpviewrenderer.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpviewrenderer.c
* Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
* Copyright (C) 2007 Sven Neumann <sven@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "base/temp-buf.h"
#include "core/gimpcontext.h"
#include "core/gimpmarshal.h"
#include "core/gimpviewable.h"
#include "gimprender.h"
#include "gimpviewrenderer.h"
#include "gimpviewrenderer-utils.h"
#include "gimpwidgets-utils.h"
enum
{
UPDATE,
LAST_SIGNAL
};
static void gimp_view_renderer_dispose (GObject *object);
static void gimp_view_renderer_finalize (GObject *object);
static gboolean gimp_view_renderer_idle_update (GimpViewRenderer *renderer);
static void gimp_view_renderer_real_set_context (GimpViewRenderer *renderer,
GimpContext *context);
static void gimp_view_renderer_real_invalidate (GimpViewRenderer *renderer);
static void gimp_view_renderer_real_draw (GimpViewRenderer *renderer,
GtkWidget *widget,
cairo_t *cr,
const GdkRectangle *draw_area);
static void gimp_view_renderer_real_render (GimpViewRenderer *renderer,
GtkWidget *widget);
static void gimp_view_renderer_size_changed (GimpViewRenderer *renderer,
GimpViewable *viewable);
static cairo_pattern_t *
gimp_view_renderer_create_background (GimpViewRenderer *renderer,
GtkWidget *widget);
static void gimp_view_render_to_surface (TempBuf *temp_buf,
gint channel,
GimpViewBG inside_bg,
GimpViewBG outside_bg,
cairo_surface_t *surface,
gint dest_width,
gint dest_height);
G_DEFINE_TYPE (GimpViewRenderer, gimp_view_renderer, G_TYPE_OBJECT)
#define parent_class gimp_view_renderer_parent_class
static guint renderer_signals[LAST_SIGNAL] = { 0 };
static GimpRGB black_color;
static GimpRGB white_color;
static GimpRGB green_color;
static GimpRGB red_color;
static void
gimp_view_renderer_class_init (GimpViewRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
renderer_signals[UPDATE] =
g_signal_new ("update",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewRendererClass, update),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->dispose = gimp_view_renderer_dispose;
object_class->finalize = gimp_view_renderer_finalize;
klass->update = NULL;
klass->set_context = gimp_view_renderer_real_set_context;
klass->invalidate = gimp_view_renderer_real_invalidate;
klass->draw = gimp_view_renderer_real_draw;
klass->render = gimp_view_renderer_real_render;
klass->frame = NULL;
klass->frame_left = 0;
klass->frame_right = 0;
klass->frame_top = 0;
klass->frame_bottom = 0;
gimp_rgba_set (&black_color, 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&white_color, 1.0, 1.0, 1.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&green_color, 0.0, 0.94, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&red_color, 1.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
}
static void
gimp_view_renderer_init (GimpViewRenderer *renderer)
{
renderer->context = NULL;
renderer->viewable_type = G_TYPE_NONE;
renderer->viewable = NULL;
renderer->width = 0;
renderer->height = 0;
renderer->border_width = 0;
renderer->dot_for_dot = TRUE;
renderer->is_popup = FALSE;
renderer->border_type = GIMP_VIEW_BORDER_BLACK;
renderer->border_color = black_color;
renderer->surface = NULL;
renderer->pattern = NULL;
renderer->pixbuf = NULL;
renderer->bg_stock_id = NULL;
renderer->size = -1;
renderer->needs_render = TRUE;
renderer->idle_id = 0;
}
static void
gimp_view_renderer_dispose (GObject *object)
{
GimpViewRenderer *renderer = GIMP_VIEW_RENDERER (object);
if (renderer->viewable)
gimp_view_renderer_set_viewable (renderer, NULL);
if (renderer->context)
gimp_view_renderer_set_context (renderer, NULL);
gimp_view_renderer_remove_idle (renderer);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_view_renderer_finalize (GObject *object)
{
GimpViewRenderer *renderer = GIMP_VIEW_RENDERER (object);
if (renderer->pattern)
{
cairo_pattern_destroy (renderer->pattern);
renderer->pattern = NULL;
}
if (renderer->surface)
{
cairo_surface_destroy (renderer->surface);
renderer->surface = NULL;
}
if (renderer->pixbuf)
{
g_object_unref (renderer->pixbuf);
renderer->pixbuf = NULL;
}
if (renderer->bg_stock_id)
{
g_free (renderer->bg_stock_id);
renderer->bg_stock_id = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GimpViewRenderer *
gimp_view_renderer_new_internal (GimpContext *context,
GType viewable_type,
gboolean is_popup)
{
GimpViewRenderer *renderer;
renderer = g_object_new (gimp_view_renderer_type_from_viewable_type (viewable_type),
NULL);
renderer->viewable_type = viewable_type;
renderer->is_popup = is_popup ? TRUE : FALSE;
if (context)
gimp_view_renderer_set_context (renderer, context);
return renderer;
}
/* public functions */
GimpViewRenderer *
gimp_view_renderer_new (GimpContext *context,
GType viewable_type,
gint size,
gint border_width,
gboolean is_popup)
{
GimpViewRenderer *renderer;
g_return_val_if_fail (context == NULL || GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (g_type_is_a (viewable_type, GIMP_TYPE_VIEWABLE), NULL);
g_return_val_if_fail (size > 0 &&
size <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE, NULL);
g_return_val_if_fail (border_width >= 0 &&
border_width <= GIMP_VIEW_MAX_BORDER_WIDTH, NULL);
renderer = gimp_view_renderer_new_internal (context, viewable_type,
is_popup);
gimp_view_renderer_set_size (renderer, size, border_width);
gimp_view_renderer_remove_idle (renderer);
return renderer;
}
GimpViewRenderer *
gimp_view_renderer_new_full (GimpContext *context,
GType viewable_type,
gint width,
gint height,
gint border_width,
gboolean is_popup)
{
GimpViewRenderer *renderer;
g_return_val_if_fail (context == NULL || GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (g_type_is_a (viewable_type, GIMP_TYPE_VIEWABLE), NULL);
g_return_val_if_fail (width > 0 &&
width <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE, NULL);
g_return_val_if_fail (height > 0 &&
height <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE, NULL);
g_return_val_if_fail (border_width >= 0 &&
border_width <= GIMP_VIEW_MAX_BORDER_WIDTH, NULL);
renderer = gimp_view_renderer_new_internal (context, viewable_type,
is_popup);
gimp_view_renderer_set_size_full (renderer, width, height, border_width);
gimp_view_renderer_remove_idle (renderer);
return renderer;
}
void
gimp_view_renderer_set_context (GimpViewRenderer *renderer,
GimpContext *context)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (context == NULL || GIMP_IS_CONTEXT (context));
if (context != renderer->context)
{
GIMP_VIEW_RENDERER_GET_CLASS (renderer)->set_context (renderer,
context);
if (renderer->viewable)
gimp_view_renderer_invalidate (renderer);
}
}
void
gimp_view_renderer_set_viewable (GimpViewRenderer *renderer,
GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (viewable == NULL || GIMP_IS_VIEWABLE (viewable));
if (viewable)
g_return_if_fail (g_type_is_a (G_TYPE_FROM_INSTANCE (viewable),
renderer->viewable_type));
if (viewable == renderer->viewable)
return;
if (renderer->surface)
{
cairo_surface_destroy (renderer->surface);
renderer->surface = NULL;
}
if (renderer->pixbuf)
{
g_object_unref (renderer->pixbuf);
renderer->pixbuf = NULL;
}
if (renderer->viewable)
{
g_object_remove_weak_pointer (G_OBJECT (renderer->viewable),
(gpointer) &renderer->viewable);
g_signal_handlers_disconnect_by_func (renderer->viewable,
G_CALLBACK (gimp_view_renderer_invalidate),
renderer);
g_signal_handlers_disconnect_by_func (renderer->viewable,
G_CALLBACK (gimp_view_renderer_size_changed),
renderer);
}
renderer->viewable = viewable;
if (renderer->viewable)
{
g_object_add_weak_pointer (G_OBJECT (renderer->viewable),
(gpointer) &renderer->viewable);
g_signal_connect_swapped (renderer->viewable,
"invalidate-preview",
G_CALLBACK (gimp_view_renderer_invalidate),
renderer);
g_signal_connect_swapped (renderer->viewable,
"size-changed",
G_CALLBACK (gimp_view_renderer_size_changed),
renderer);
if (renderer->size != -1)
gimp_view_renderer_set_size (renderer, renderer->size,
renderer->border_width);
gimp_view_renderer_invalidate (renderer);
}
else
{
gimp_view_renderer_update_idle (renderer);
}
}
void
gimp_view_renderer_set_size (GimpViewRenderer *renderer,
gint view_size,
gint border_width)
{
gint width;
gint height;
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (view_size > 0 &&
view_size <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE);
g_return_if_fail (border_width >= 0 &&
border_width <= GIMP_VIEW_MAX_BORDER_WIDTH);
renderer->size = view_size;
if (renderer->viewable)
{
gimp_viewable_get_preview_size (renderer->viewable,
view_size,
renderer->is_popup,
renderer->dot_for_dot,
&width, &height);
}
else
{
width = view_size;
height = view_size;
}
gimp_view_renderer_set_size_full (renderer, width, height, border_width);
}
void
gimp_view_renderer_set_size_full (GimpViewRenderer *renderer,
gint width,
gint height,
gint border_width)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (width > 0 &&
width <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE);
g_return_if_fail (height > 0 &&
height <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE);
g_return_if_fail (border_width >= 0 &&
border_width <= GIMP_VIEW_MAX_BORDER_WIDTH);
if (width != renderer->width ||
height != renderer->height ||
border_width != renderer->border_width)
{
renderer->width = width;
renderer->height = height;
renderer->border_width = border_width;
if (renderer->surface)
{
cairo_surface_destroy (renderer->surface);
renderer->surface = NULL;
}
if (renderer->viewable)
gimp_view_renderer_invalidate (renderer);
}
}
void
gimp_view_renderer_set_dot_for_dot (GimpViewRenderer *renderer,
gboolean dot_for_dot)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
if (dot_for_dot != renderer->dot_for_dot)
{
renderer->dot_for_dot = dot_for_dot ? TRUE: FALSE;
if (renderer->size != -1)
gimp_view_renderer_set_size (renderer, renderer->size,
renderer->border_width);
gimp_view_renderer_invalidate (renderer);
}
}
void
gimp_view_renderer_set_border_type (GimpViewRenderer *renderer,
GimpViewBorderType border_type)
{
GimpRGB *border_color = &black_color;
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
renderer->border_type = border_type;
switch (border_type)
{
case GIMP_VIEW_BORDER_BLACK:
border_color = &black_color;
break;
case GIMP_VIEW_BORDER_WHITE:
border_color = &white_color;
break;
case GIMP_VIEW_BORDER_GREEN:
border_color = &green_color;
break;
case GIMP_VIEW_BORDER_RED:
border_color = &red_color;
break;
}
gimp_view_renderer_set_border_color (renderer, border_color);
}
void
gimp_view_renderer_set_border_color (GimpViewRenderer *renderer,
const GimpRGB *color)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (color != NULL);
if (gimp_rgb_distance (&renderer->border_color, color))
{
renderer->border_color = *color;
gimp_view_renderer_update_idle (renderer);
}
}
void
gimp_view_renderer_set_background (GimpViewRenderer *renderer,
const gchar *stock_id)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
if (renderer->bg_stock_id)
g_free (renderer->bg_stock_id);
renderer->bg_stock_id = g_strdup (stock_id);
if (renderer->pattern)
{
g_object_unref (renderer->pattern);
renderer->pattern = NULL;
}
}
void
gimp_view_renderer_invalidate (GimpViewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
if (renderer->idle_id)
{
g_source_remove (renderer->idle_id);
renderer->idle_id = 0;
}
GIMP_VIEW_RENDERER_GET_CLASS (renderer)->invalidate (renderer);
renderer->idle_id =
g_idle_add_full (GIMP_VIEWABLE_PRIORITY_IDLE,
(GSourceFunc) gimp_view_renderer_idle_update,
renderer, NULL);
}
void
gimp_view_renderer_update (GimpViewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
if (renderer->idle_id)
{
g_source_remove (renderer->idle_id);
renderer->idle_id = 0;
}
g_signal_emit (renderer, renderer_signals[UPDATE], 0);
}
void
gimp_view_renderer_update_idle (GimpViewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
if (renderer->idle_id)
g_source_remove (renderer->idle_id);
renderer->idle_id =
g_idle_add_full (GIMP_VIEWABLE_PRIORITY_IDLE,
(GSourceFunc) gimp_view_renderer_idle_update,
renderer, NULL);
}
void
gimp_view_renderer_remove_idle (GimpViewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
if (renderer->idle_id)
{
g_source_remove (renderer->idle_id);
renderer->idle_id = 0;
}
}
void
gimp_view_renderer_draw (GimpViewRenderer *renderer,
GdkWindow *window,
GtkWidget *widget,
const GdkRectangle *draw_area,
const GdkRectangle *expose_area)
{
cairo_t *cr;
GdkRectangle render_rect;
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (GDK_IS_WINDOW (window));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (draw_area != NULL);
g_return_if_fail (expose_area != NULL);
if (G_UNLIKELY (renderer->context == NULL))
g_warning ("%s: renderer->context is NULL", G_STRFUNC);
if (! gtk_widget_is_drawable (widget))
return;
if (! gdk_rectangle_intersect ((GdkRectangle *) draw_area,
(GdkRectangle *) expose_area,
&render_rect))
return;
cr = gdk_cairo_create (window);
gdk_cairo_rectangle (cr, &render_rect);
cairo_clip (cr);
if (renderer->viewable)
{
cairo_save (cr);
GIMP_VIEW_RENDERER_GET_CLASS (renderer)->draw (renderer,
widget, cr, draw_area);
cairo_restore (cr);
}
else
{
GimpViewableClass *viewable_class;
viewable_class = g_type_class_ref (renderer->viewable_type);
gimp_view_renderer_default_render_stock (renderer,
widget,
viewable_class->default_stock_id);
g_type_class_unref (viewable_class);
gimp_view_renderer_real_draw (renderer, widget, cr, draw_area);
}
if (renderer->border_width > 0)
{
gint width = renderer->width + renderer->border_width;
gint height = renderer->height + renderer->border_width;
gdouble x, y;
cairo_set_line_width (cr, renderer->border_width);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
gimp_cairo_set_source_rgb (cr, &renderer->border_color);
x = draw_area->x + (draw_area->width - width) / 2.0;
y = draw_area->y + (draw_area->height - height) / 2.0;
cairo_rectangle (cr, x, y, width, height);
cairo_stroke (cr);
}
cairo_destroy (cr);
}
/* private functions */
static gboolean
gimp_view_renderer_idle_update (GimpViewRenderer *renderer)
{
renderer->idle_id = 0;
gimp_view_renderer_update (renderer);
return FALSE;
}
static void
gimp_view_renderer_real_set_context (GimpViewRenderer *renderer,
GimpContext *context)
{
if (renderer->context)
g_object_unref (renderer->context);
renderer->context = context;
if (renderer->context)
g_object_ref (renderer->context);
}
static void
gimp_view_renderer_real_invalidate (GimpViewRenderer *renderer)
{
renderer->needs_render = TRUE;
}
static void
gimp_view_renderer_real_draw (GimpViewRenderer *renderer,
GtkWidget *widget,
cairo_t *cr,
const GdkRectangle *area)
{
if (renderer->needs_render)
GIMP_VIEW_RENDERER_GET_CLASS (renderer)->render (renderer, widget);
if (renderer->pixbuf)
{
gint width = gdk_pixbuf_get_width (renderer->pixbuf);
gint height = gdk_pixbuf_get_height (renderer->pixbuf);
gint x, y;
if (renderer->bg_stock_id)
{
if (! renderer->pattern)
renderer->pattern = gimp_view_renderer_create_background (renderer,
widget);
cairo_set_source (cr, renderer->pattern);
cairo_paint (cr);
}
x = area->x + (area->width - width) / 2;
y = area->y + (area->height - height) / 2;
gdk_cairo_set_source_pixbuf (cr, renderer->pixbuf, x, y);
cairo_rectangle (cr, x, y, width, height);
cairo_fill (cr);
}
else if (renderer->surface)
{
cairo_content_t content = cairo_surface_get_content (renderer->surface);
gint width = renderer->width;
gint height = renderer->height;
gint offset_x = area->x + (area->width - width) / 2;
gint offset_y = area->y + (area->height - height) / 2;
cairo_translate (cr, offset_x, offset_y);
cairo_rectangle (cr, 0, 0, width, height);
if (content == CAIRO_CONTENT_COLOR_ALPHA)
{
if (! renderer->pattern)
{
renderer->pattern =
gimp_cairo_checkerboard_create (cr, GIMP_CHECK_SIZE_SM,
gimp_render_light_check_color (),
gimp_render_dark_check_color ());
}
cairo_set_source (cr, renderer->pattern);
cairo_fill_preserve (cr);
}
cairo_set_source_surface (cr, renderer->surface, 0, 0);
cairo_fill (cr);
cairo_translate (cr, - offset_x, - offset_y);
}
}
static void
gimp_view_renderer_real_render (GimpViewRenderer *renderer,
GtkWidget *widget)
{
GdkPixbuf *pixbuf;
TempBuf *temp_buf;
const gchar *stock_id;
pixbuf = gimp_viewable_get_pixbuf (renderer->viewable,
renderer->context,
renderer->width,
renderer->height);
if (pixbuf)
{
gimp_view_renderer_render_pixbuf (renderer, pixbuf);
return;
}
temp_buf = gimp_viewable_get_preview (renderer->viewable,
renderer->context,
renderer->width,
renderer->height);
if (temp_buf)
{
gimp_view_renderer_default_render_surface (renderer, widget, temp_buf);
return;
}
stock_id = gimp_viewable_get_stock_id (renderer->viewable);
gimp_view_renderer_default_render_stock (renderer, widget, stock_id);
}
static void
gimp_view_renderer_size_changed (GimpViewRenderer *renderer,
GimpViewable *viewable)
{
if (renderer->size != -1)
gimp_view_renderer_set_size (renderer, renderer->size,
renderer->border_width);
gimp_view_renderer_invalidate (renderer);
}
/* protected functions */
void
gimp_view_renderer_default_render_surface (GimpViewRenderer *renderer,
GtkWidget *widget,
TempBuf *temp_buf)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (temp_buf != NULL);
if (temp_buf->width < renderer->width)
temp_buf->x = (renderer->width - temp_buf->width) / 2;
if (temp_buf->height < renderer->height)
temp_buf->y = (renderer->height - temp_buf->height) / 2;
gimp_view_renderer_render_surface (renderer, temp_buf, -1,
GIMP_VIEW_BG_CHECKS,
GIMP_VIEW_BG_WHITE);
}
void
gimp_view_renderer_default_render_stock (GimpViewRenderer *renderer,
GtkWidget *widget,
const gchar *stock_id)
{
GdkPixbuf *pixbuf = NULL;
GtkIconSize icon_size;
g_return_if_fail (GIMP_IS_VIEW_RENDERER (renderer));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (stock_id != NULL);
if (renderer->pixbuf)
{
g_object_unref (renderer->pixbuf);
renderer->pixbuf = NULL;
}
if (renderer->surface)
{
cairo_surface_destroy (renderer->surface);
renderer->surface = NULL;
}
icon_size = gimp_get_icon_size (widget, stock_id, GTK_ICON_SIZE_INVALID,
renderer->width, renderer->height);
if (icon_size)
pixbuf = gtk_widget_render_icon (widget, stock_id, icon_size, NULL);
if (pixbuf)
{
gint width = gdk_pixbuf_get_width (pixbuf);
gint height = gdk_pixbuf_get_height (pixbuf);
if (width > renderer->width || height > renderer->height)
{
GdkPixbuf *scaled_pixbuf;
gimp_viewable_calc_preview_size (width, height,
renderer->width, renderer->height,
TRUE, 1.0, 1.0,
&width, &height,
NULL);
scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf,
width, height,
GDK_INTERP_BILINEAR);
g_object_unref (pixbuf);
pixbuf = scaled_pixbuf;
}
renderer->pixbuf = pixbuf;
}
renderer->needs_render = FALSE;
}
void
gimp_view_renderer_render_surface (GimpViewRenderer *renderer,
TempBuf *temp_buf,
gint channel,
GimpViewBG inside_bg,
GimpViewBG outside_bg)
{
if (renderer->pixbuf)
{
g_object_unref (renderer->pixbuf);
renderer->pixbuf = NULL;
}
if (! renderer->surface)
renderer->surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
renderer->width,
renderer->height);
gimp_view_render_to_surface (temp_buf,
channel,
inside_bg,
outside_bg,
renderer->surface,
renderer->width,
renderer->height);
renderer->needs_render = FALSE;
}
static void
gimp_view_render_to_surface (TempBuf *temp_buf,
gint channel,
GimpViewBG inside_bg,
GimpViewBG outside_bg,
cairo_surface_t *surface,
gint dest_width,
gint dest_height)
{
const guchar *src;
const guchar *pad_buf;
guchar *dest;
gint i, j;
gint x1, y1;
gint x2, y2;
gint rowstride;
gint dest_stride;
gboolean color;
gboolean has_alpha;
gboolean render_composite;
gint red_component;
gint green_component;
gint blue_component;
gint alpha_component;
g_return_if_fail (temp_buf != NULL);
g_return_if_fail (surface != NULL);
/* In rare cases we can get here while GIMP is exiting, handle that
* by checking for availability of the buffers
*/
if (! gimp_render_check_buf ||
! gimp_render_empty_buf ||
! gimp_render_white_buf)
return;
cairo_surface_flush (surface);
dest = cairo_image_surface_get_data (surface);
dest_stride = cairo_image_surface_get_stride (surface);
/* Here are the different cases this functions handles correctly:
* 1) Offset temp_buf which does not necessarily cover full image area
* 2) Color conversion of temp_buf if it is gray and image is color
* 3) Background check buffer for transparent temp_bufs
* 4) Using the optional "channel" argument, one channel can be extracted
* from a multi-channel temp_buf and composited as a grayscale
* Prereqs:
* 1) Grayscale temp_bufs have bytes == {1, 2}
* 2) Color temp_bufs have bytes == {3, 4}
* 3) If image is gray, then temp_buf should have bytes == {1, 2}
*/
color = (temp_buf->bytes == 3 || temp_buf->bytes == 4);
has_alpha = (temp_buf->bytes == 2 || temp_buf->bytes == 4);
render_composite = (channel == -1);
rowstride = temp_buf->width * temp_buf->bytes;
/* render the checkerboard only if the temp_buf has alpha *and*
* we render a composite view
*/
if (has_alpha && render_composite && outside_bg == GIMP_VIEW_BG_CHECKS)
pad_buf = gimp_render_check_buf;
else if (outside_bg == GIMP_VIEW_BG_WHITE)
pad_buf = gimp_render_white_buf;
else
pad_buf = gimp_render_empty_buf;
if (render_composite)
{
if (color)
{
red_component = RED;
green_component = GREEN;
blue_component = BLUE;
alpha_component = ALPHA;
}
else
{
red_component = GRAY;
green_component = GRAY;
blue_component = GRAY;
alpha_component = ALPHA_G;
}
}
else
{
red_component = channel;
green_component = channel;
blue_component = channel;
alpha_component = 0;
}
x1 = CLAMP (temp_buf->x, 0, dest_width);
y1 = CLAMP (temp_buf->y, 0, dest_height);
x2 = CLAMP (temp_buf->x + temp_buf->width, 0, dest_width);
y2 = CLAMP (temp_buf->y + temp_buf->height, 0, dest_height);
src = temp_buf_get_data (temp_buf) + ((y1 - temp_buf->y) * rowstride +
(x1 - temp_buf->x) * temp_buf->bytes);
for (i = 0; i < dest_height; i++)
{
guchar *d = dest;
const guchar *cb;
gint offset;
if (i & 0x4)
{
offset = 4;
cb = pad_buf + offset * 3;
}
else
{
offset = 0;
cb = pad_buf;
}
/* The interesting stuff between leading & trailing
* vertical transparency
*/
if (i >= y1 && i < y2)
{
const guchar *s = src;
/* Handle the leading transparency */
for (j = 0; j < x1; j++, d += 4, cb += 3)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d, cb[0], cb[1], cb[2]);
}
/* The stuff in the middle */
for (j = x1; j < x2; j++, d += 4, s += temp_buf->bytes)
{
if (has_alpha && render_composite)
{
const guint a = s[alpha_component] << 8;
if (inside_bg == GIMP_VIEW_BG_CHECKS)
{
if ((j + offset) & 0x4)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d,
gimp_render_blend_dark_check [a | s[red_component]],
gimp_render_blend_dark_check [a | s[green_component]],
gimp_render_blend_dark_check [a | s[blue_component]]);
}
else
{
GIMP_CAIRO_RGB24_SET_PIXEL (d,
gimp_render_blend_light_check [a | s[red_component]],
gimp_render_blend_light_check [a | s[green_component]],
gimp_render_blend_light_check [a | s[blue_component]]);
}
}
else /* GIMP_VIEW_BG_WHITE */
{
GIMP_CAIRO_RGB24_SET_PIXEL (d,
gimp_render_blend_white [a | s[red_component]],
gimp_render_blend_white [a | s[green_component]],
gimp_render_blend_white [a | s[blue_component]]);
}
}
else
{
GIMP_CAIRO_RGB24_SET_PIXEL (d,
s[red_component],
s[green_component],
s[blue_component]);
}
}
/* Handle the trailing transparency */
for (j = x2; j < dest_width; j++, d+= 4, cb += 3)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d, cb[0], cb[1], cb[2]);
}
src += rowstride;
}
else
{
for (j = 0; j < dest_width; j++, d+= 4, cb += 3)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d, cb[0], cb[1], cb[2]);
}
}
dest += dest_stride;
}
cairo_surface_mark_dirty (surface);
}
void
gimp_view_renderer_render_pixbuf (GimpViewRenderer *renderer,
GdkPixbuf *pixbuf)
{
if (renderer->surface)
{
cairo_surface_destroy (renderer->surface);
renderer->surface = NULL;
}
g_object_ref (pixbuf);
if (renderer->pixbuf)
g_object_unref (renderer->pixbuf);
renderer->pixbuf = pixbuf;
renderer->needs_render = FALSE;
}
/* This function creates a background pattern from a stock icon
* if renderer->bg_stock_id is set.
*/
static cairo_pattern_t *
gimp_view_renderer_create_background (GimpViewRenderer *renderer,
GtkWidget *widget)
{
cairo_pattern_t *pattern = NULL;
if (renderer->bg_stock_id)
{
GdkPixbuf *pixbuf = gtk_widget_render_icon (widget,
renderer->bg_stock_id,
GTK_ICON_SIZE_DIALOG, NULL);
if (pixbuf)
{
cairo_surface_t *surface;
surface = gimp_cairo_surface_create_from_pixbuf (pixbuf);
g_object_unref (pixbuf);
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
cairo_surface_destroy (surface);
}
}
return pattern;
}
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