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gimp/app/widgets/gimppreviewrenderer.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimppreviewrenderer.c
* Copyright (C) 2003 Michael Natterer <mitch@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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#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"
#ifdef __GNUC__
#warning FIXME #include "display/display-types.h"
#endif
#include "display/display-types.h"
#include "base/temp-buf.h"
#include "core/gimpmarshal.h"
#include "core/gimpviewable.h"
#include "display/gimpdisplayshell-render.h"
#include "gimppreviewrenderer.h"
#include "gimppreviewrenderer-utils.h"
enum
{
UPDATE,
LAST_SIGNAL
};
static void gimp_preview_renderer_class_init (GimpPreviewRendererClass *klass);
static void gimp_preview_renderer_init (GimpPreviewRenderer *renderer);
static void gimp_preview_renderer_finalize (GObject *object);
static gboolean gimp_preview_renderer_idle_invalidate (GimpPreviewRenderer *renderer);
static void gimp_preview_renderer_real_render (GimpPreviewRenderer *renderer,
GtkWidget *widget);
static void gimp_preview_renderer_size_changed (GimpPreviewRenderer *renderer,
GimpViewable *viewable);
static guint renderer_signals[LAST_SIGNAL] = { 0 };
static GObjectClass *parent_class = NULL;
GType
gimp_preview_renderer_get_type (void)
{
static GType renderer_type = 0;
if (! renderer_type)
{
static const GTypeInfo renderer_info =
{
sizeof (GimpPreviewRendererClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gimp_preview_renderer_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPreviewRenderer),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_preview_renderer_init,
};
renderer_type = g_type_register_static (G_TYPE_OBJECT,
"GimpPreviewRenderer",
&renderer_info, 0);
}
return renderer_type;
}
static void
gimp_preview_renderer_class_init (GimpPreviewRendererClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
renderer_signals[UPDATE] =
g_signal_new ("update",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPreviewRendererClass, update),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->finalize = gimp_preview_renderer_finalize;
klass->render = gimp_preview_renderer_real_render;
}
static void
gimp_preview_renderer_init (GimpPreviewRenderer *renderer)
{
renderer->viewable = NULL;
renderer->width = 8;
renderer->height = 8;
renderer->border_width = 0;
renderer->dot_for_dot = TRUE;
renderer->is_popup = FALSE;
gimp_rgba_set (&renderer->border_color, 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
renderer->border_gc = NULL;
renderer->buffer = NULL;
renderer->rowstride = 0;
renderer->bytes = 3;
renderer->no_preview_pixbuf = NULL;
renderer->size = -1;
renderer->needs_render = TRUE;
renderer->idle_id = 0;
}
static void
gimp_preview_renderer_finalize (GObject *object)
{
GimpPreviewRenderer *renderer;
renderer = GIMP_PREVIEW_RENDERER (object);
if (renderer->idle_id)
{
g_source_remove (renderer->idle_id);
renderer->idle_id = 0;
}
if (renderer->viewable)
gimp_preview_renderer_set_viewable (renderer, NULL);
if (renderer->buffer)
{
g_free (renderer->buffer);
renderer->buffer = NULL;
}
if (renderer->no_preview_pixbuf)
{
g_object_unref (renderer->no_preview_pixbuf);
renderer->no_preview_pixbuf = NULL;
}
if (renderer->border_gc)
{
g_object_unref (renderer->border_gc);
renderer->border_gc = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* public functions */
GimpPreviewRenderer *
gimp_preview_renderer_new (GType viewable_type,
gint size,
gint border_width,
gboolean is_popup)
{
GimpPreviewRenderer *renderer;
g_return_val_if_fail (g_type_is_a (viewable_type, GIMP_TYPE_VIEWABLE), NULL);
g_return_val_if_fail (size > 0 && size <= GIMP_PREVIEW_MAX_SIZE, NULL);
g_return_val_if_fail (border_width >= 0 &&
border_width <= GIMP_PREVIEW_MAX_BORDER_WIDTH, NULL);
renderer = g_object_new (gimp_preview_renderer_type_from_viewable_type (viewable_type),
NULL);
renderer->is_popup = is_popup ? TRUE : FALSE;
gimp_preview_renderer_set_size (renderer, size, border_width);
gimp_preview_renderer_remove_idle (renderer);
return renderer;
}
GimpPreviewRenderer *
gimp_preview_renderer_new_full (GType viewable_type,
gint width,
gint height,
gint border_width,
gboolean is_popup)
{
GimpPreviewRenderer *renderer;
g_return_val_if_fail (g_type_is_a (viewable_type, GIMP_TYPE_VIEWABLE), NULL);
g_return_val_if_fail (width > 0 && width <= GIMP_PREVIEW_MAX_SIZE, NULL);
g_return_val_if_fail (height > 0 && height <= GIMP_PREVIEW_MAX_SIZE, NULL);
g_return_val_if_fail (border_width >= 0 &&
border_width <= GIMP_PREVIEW_MAX_BORDER_WIDTH, NULL);
renderer = g_object_new (gimp_preview_renderer_type_from_viewable_type (viewable_type),
NULL);
renderer->is_popup = is_popup ? TRUE : FALSE;
gimp_preview_renderer_set_size_full (renderer, width, height, border_width);
gimp_preview_renderer_remove_idle (renderer);
return renderer;
}
void
gimp_preview_renderer_set_viewable (GimpPreviewRenderer *renderer,
GimpViewable *viewable)
{
GType viewable_type = G_TYPE_NONE;
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
g_return_if_fail (! viewable || GIMP_IS_VIEWABLE (viewable));
if (viewable)
{
viewable_type = G_TYPE_FROM_INSTANCE (viewable);
g_return_if_fail (g_type_is_a (G_TYPE_FROM_INSTANCE (renderer),
gimp_preview_renderer_type_from_viewable_type (viewable_type)));
}
if (viewable == renderer->viewable)
return;
if (renderer->buffer)
{
g_free (renderer->buffer);
renderer->buffer = NULL;
}
if (renderer->no_preview_pixbuf)
{
g_object_unref (renderer->no_preview_pixbuf);
renderer->no_preview_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_preview_renderer_invalidate),
renderer);
g_signal_handlers_disconnect_by_func (renderer->viewable,
G_CALLBACK (gimp_preview_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_preview_renderer_invalidate),
renderer);
g_signal_connect_swapped (renderer->viewable,
"size_changed",
G_CALLBACK (gimp_preview_renderer_size_changed),
renderer);
if (renderer->size != -1)
gimp_preview_renderer_set_size (renderer, renderer->size,
renderer->border_width);
else
gimp_preview_renderer_invalidate (renderer);
}
}
void
gimp_preview_renderer_set_size (GimpPreviewRenderer *renderer,
gint preview_size,
gint border_width)
{
gint width, height;
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
g_return_if_fail (preview_size > 0 && preview_size <= GIMP_PREVIEW_MAX_SIZE);
g_return_if_fail (border_width >= 0 &&
border_width <= GIMP_PREVIEW_MAX_BORDER_WIDTH);
renderer->size = preview_size;
if (renderer->viewable)
{
gimp_viewable_get_preview_size (renderer->viewable,
preview_size,
renderer->is_popup,
renderer->dot_for_dot,
&width, &height);
}
else
{
width = preview_size;
height = preview_size;
}
gimp_preview_renderer_set_size_full (renderer, width, height, border_width);
}
void
gimp_preview_renderer_set_size_full (GimpPreviewRenderer *renderer,
gint width,
gint height,
gint border_width)
{
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
g_return_if_fail (width > 0 && width <= GIMP_PREVIEW_MAX_SIZE);
g_return_if_fail (height > 0 && height <= GIMP_PREVIEW_MAX_SIZE);
g_return_if_fail (border_width >= 0 &&
border_width <= GIMP_PREVIEW_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;
renderer->rowstride = (renderer->width * renderer->bytes + 3) & ~3;
if (renderer->buffer)
{
g_free (renderer->buffer);
renderer->buffer = NULL;
}
if (renderer->viewable)
gimp_preview_renderer_invalidate (renderer);
}
}
void
gimp_preview_renderer_set_dot_for_dot (GimpPreviewRenderer *renderer,
gboolean dot_for_dot)
{
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
if (dot_for_dot != renderer->dot_for_dot)
{
renderer->dot_for_dot = dot_for_dot ? TRUE: FALSE;
if (renderer->size != -1)
gimp_preview_renderer_set_size (renderer, renderer->size,
renderer->border_width);
gimp_preview_renderer_invalidate (renderer);
}
}
void
gimp_preview_renderer_set_border_color (GimpPreviewRenderer *renderer,
const GimpRGB *color)
{
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
g_return_if_fail (color != NULL);
if (gimp_rgb_distance (&renderer->border_color, color))
{
renderer->border_color = *color;
if (renderer->border_gc)
{
GdkColor gdk_color;
guchar r, g, b;
gimp_rgb_get_uchar (&renderer->border_color, &r, &g, &b);
gdk_color.red = r | r << 8;
gdk_color.green = g | g << 8;
gdk_color.blue = b | b << 8;
gdk_gc_set_rgb_fg_color (renderer->border_gc, &gdk_color);
}
gimp_preview_renderer_update (renderer);
}
}
void
gimp_preview_renderer_invalidate (GimpPreviewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
if (renderer->idle_id)
g_source_remove (renderer->idle_id);
renderer->needs_render = TRUE;
renderer->idle_id =
g_idle_add_full (G_PRIORITY_LOW,
(GSourceFunc) gimp_preview_renderer_idle_invalidate,
renderer, NULL);
}
void
gimp_preview_renderer_update (GimpPreviewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_PREVIEW_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_preview_renderer_remove_idle (GimpPreviewRenderer *renderer)
{
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
if (renderer->idle_id)
{
g_source_remove (renderer->idle_id);
renderer->idle_id = 0;
}
}
void
gimp_preview_renderer_draw (GimpPreviewRenderer *renderer,
GdkWindow *window,
GtkWidget *widget,
GdkRectangle *draw_area,
GdkRectangle *expose_area)
{
GdkRectangle border_rect;
GdkRectangle buf_rect;
GdkRectangle render_rect;
g_return_if_fail (GIMP_IS_PREVIEW_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 (! GTK_WIDGET_DRAWABLE (widget) || ! renderer->viewable)
return;
if (renderer->needs_render)
GIMP_PREVIEW_RENDERER_GET_CLASS (renderer)->render (renderer, widget);
border_rect.x = draw_area->x;
border_rect.y = draw_area->y;
border_rect.width = renderer->width + 2 * renderer->border_width;
border_rect.height = renderer->height + 2 * renderer->border_width;
if (draw_area->width > border_rect.width)
border_rect.x += (draw_area->width - border_rect.width) / 2;
if (draw_area->height > border_rect.height)
border_rect.y += (draw_area->height - border_rect.height) / 2;
if (renderer->no_preview_pixbuf)
{
buf_rect.width = gdk_pixbuf_get_width (renderer->no_preview_pixbuf);
buf_rect.height = gdk_pixbuf_get_height (renderer->no_preview_pixbuf);
buf_rect.x = (draw_area->width - buf_rect.width) / 2;
buf_rect.y = (draw_area->height - buf_rect.height) / 2;
buf_rect.x += draw_area->x;
buf_rect.y += draw_area->y;
if (gdk_rectangle_intersect (&buf_rect, expose_area, &render_rect))
{
gdk_draw_pixbuf (GDK_DRAWABLE (window),
widget->style->bg_gc[widget->state],
renderer->no_preview_pixbuf,
render_rect.x - buf_rect.x,
render_rect.y - buf_rect.y,
render_rect.x,
render_rect.y,
render_rect.width,
render_rect.height,
GDK_RGB_DITHER_NORMAL,
expose_area->x - draw_area->x,
expose_area->y - draw_area->y);
}
}
else if (renderer->buffer)
{
buf_rect.x = border_rect.x + renderer->border_width;
buf_rect.y = border_rect.y + renderer->border_width;
buf_rect.width = renderer->width;
buf_rect.height = renderer->height;
if (gdk_rectangle_intersect (&buf_rect, expose_area, &render_rect))
{
guchar *buf;
buf = (renderer->buffer +
(render_rect.y - buf_rect.y) * renderer->rowstride +
(render_rect.x - buf_rect.x) * renderer->bytes);
gdk_draw_rgb_image_dithalign (window,
widget->style->black_gc,
render_rect.x,
render_rect.y,
render_rect.width,
render_rect.height,
GDK_RGB_DITHER_NORMAL,
buf,
renderer->rowstride,
expose_area->x - draw_area->x,
expose_area->y - draw_area->y);
}
}
if (renderer->border_width > 0)
{
gint i;
if (! renderer->border_gc)
{
GdkColor color;
guchar r, g, b;
renderer->border_gc = gdk_gc_new (window);
gimp_rgb_get_uchar (&renderer->border_color, &r, &g, &b);
color.red = r | r << 8;
color.green = g | g << 8;
color.blue = b | b << 8;
gdk_gc_set_rgb_fg_color (renderer->border_gc, &color);
}
for (i = 0; i < renderer->border_width; i++)
gdk_draw_rectangle (window,
renderer->border_gc,
FALSE,
border_rect.x + i,
border_rect.y + i,
border_rect.width - 2 * i - 1,
border_rect.height - 2 * i - 1);
}
}
/* private functions */
static gboolean
gimp_preview_renderer_idle_invalidate (GimpPreviewRenderer *renderer)
{
renderer->idle_id = 0;
if (renderer->viewable)
gimp_preview_renderer_update (renderer);
return FALSE;
}
static void
gimp_preview_renderer_real_render (GimpPreviewRenderer *renderer,
GtkWidget *widget)
{
TempBuf *temp_buf;
temp_buf = gimp_viewable_get_preview (renderer->viewable,
renderer->width,
renderer->height);
if (temp_buf)
{
gimp_preview_renderer_default_render_buffer (renderer, widget, temp_buf);
}
else /* no preview available */
{
const gchar *stock_id;
stock_id = gimp_viewable_get_stock_id (renderer->viewable);
gimp_preview_renderer_default_render_stock (renderer, widget, stock_id);
}
}
static void
gimp_preview_renderer_size_changed (GimpPreviewRenderer *renderer,
GimpViewable *viewable)
{
if (renderer->size != -1)
gimp_preview_renderer_set_size (renderer, renderer->size,
renderer->border_width);
else
gimp_preview_renderer_invalidate (renderer);
}
/* protected functions */
void
gimp_preview_renderer_default_render_buffer (GimpPreviewRenderer *renderer,
GtkWidget *widget,
TempBuf *temp_buf)
{
g_return_if_fail (GIMP_IS_PREVIEW_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_preview_renderer_render_buffer (renderer, temp_buf, -1,
GIMP_PREVIEW_BG_CHECKS,
GIMP_PREVIEW_BG_WHITE);
}
void
gimp_preview_renderer_default_render_stock (GimpPreviewRenderer *renderer,
GtkWidget *widget,
const gchar *stock_id)
{
GdkPixbuf *pixbuf;
GtkIconSet *icon_set;
GtkIconSize *sizes;
gint n_sizes;
gint i;
gint width_diff = 1024;
gint height_diff = 1024;
GtkIconSize icon_size = GTK_ICON_SIZE_MENU;
g_return_if_fail (GIMP_IS_PREVIEW_RENDERER (renderer));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (stock_id != NULL);
if (renderer->no_preview_pixbuf)
{
g_object_unref (renderer->no_preview_pixbuf);
renderer->no_preview_pixbuf = NULL;
}
if (renderer->buffer)
{
g_free (renderer->buffer);
renderer->buffer = NULL;
}
icon_set = gtk_style_lookup_icon_set (widget->style, stock_id);
gtk_icon_set_get_sizes (icon_set, &sizes, &n_sizes);
for (i = 0; i < n_sizes; i++)
{
gint icon_width;
gint icon_height;
if (gtk_icon_size_lookup (sizes[i], &icon_width, &icon_height))
{
if (icon_width <= renderer->width &&
icon_height <= renderer->height &&
(ABS (icon_width - renderer->width) < width_diff ||
ABS (icon_height - renderer->height) < height_diff))
{
width_diff = ABS (icon_width - renderer->width);
height_diff = ABS (icon_height - renderer->height);
icon_size = sizes[i];
}
}
}
g_free (sizes);
pixbuf = gtk_widget_render_icon (widget, stock_id, icon_size, NULL);
if (pixbuf)
{
if (gdk_pixbuf_get_width (pixbuf) > renderer->width ||
gdk_pixbuf_get_height (pixbuf) > renderer->height)
{
GdkPixbuf *scaled_pixbuf;
gint pixbuf_width;
gint pixbuf_height;
gimp_viewable_calc_preview_size (renderer->viewable,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
renderer->width,
renderer->height,
TRUE, 1.0, 1.0,
&pixbuf_width,
&pixbuf_height,
NULL);
scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf,
pixbuf_width,
pixbuf_height,
GDK_INTERP_BILINEAR);
g_object_unref (pixbuf);
pixbuf = scaled_pixbuf;
}
renderer->no_preview_pixbuf = pixbuf;
}
renderer->needs_render = FALSE;
}
void
gimp_preview_renderer_render_buffer (GimpPreviewRenderer *renderer,
TempBuf *temp_buf,
gint channel,
GimpPreviewBG inside_bg,
GimpPreviewBG outside_bg)
{
if (! renderer->buffer)
renderer->buffer = g_new0 (guchar, renderer->height * renderer->rowstride);
if (renderer->no_preview_pixbuf)
{
g_object_unref (renderer->no_preview_pixbuf);
renderer->no_preview_pixbuf = NULL;
}
gimp_preview_render_to_buffer (temp_buf,
channel,
inside_bg,
outside_bg,
renderer->buffer,
renderer->width,
renderer->height,
renderer->rowstride,
renderer->bytes);
renderer->needs_render = FALSE;
}
void
gimp_preview_render_to_buffer (TempBuf *temp_buf,
gint channel,
GimpPreviewBG inside_bg,
GimpPreviewBG outside_bg,
guchar *dest_buffer,
gint dest_width,
gint dest_height,
gint dest_rowstride,
gint dest_bytes)
{
guchar *src, *s;
guchar *cb;
guchar *pad_buf;
gint a;
gint i, j, b;
gint x1, y1, x2, y2;
gint rowstride;
gboolean color;
gboolean has_alpha;
gboolean render_composite;
gint red_component;
gint green_component;
gint blue_component;
gint alpha_component;
gint offset;
/* 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 preview
*/
if (has_alpha && render_composite && outside_bg == GIMP_PREVIEW_BG_CHECKS)
pad_buf = render_check_buf;
else if (outside_bg == GIMP_PREVIEW_BG_WHITE)
pad_buf = render_white_buf;
else
pad_buf = render_empty_buf;
if (render_composite)
{
if (color)
{
red_component = RED_PIX;
green_component = GREEN_PIX;
blue_component = BLUE_PIX;
alpha_component = ALPHA_PIX;
}
else
{
red_component = GRAY_PIX;
green_component = GRAY_PIX;
blue_component = GRAY_PIX;
alpha_component = ALPHA_G_PIX;
}
}
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_data (temp_buf) + ((y1 - temp_buf->y) * rowstride +
(x1 - temp_buf->x) * temp_buf->bytes);
for (i = 0; i < dest_height; i++)
{
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)
{
/* Handle the leading transparency */
for (j = 0; j < x1; j++)
for (b = 0; b < dest_bytes; b++)
render_temp_buf[j * dest_bytes + b] = cb[j * 3 + b];
/* The stuff in the middle */
s = src;
for (j = x1; j < x2; j++)
{
if (has_alpha && render_composite)
{
a = s[alpha_component] << 8;
if (inside_bg == GIMP_PREVIEW_BG_CHECKS)
{
if ((j + offset) & 0x4)
{
render_temp_buf[j * 3 + 0] =
render_blend_dark_check [(a | s[red_component])];
render_temp_buf[j * 3 + 1] =
render_blend_dark_check [(a | s[green_component])];
render_temp_buf[j * 3 + 2] =
render_blend_dark_check [(a | s[blue_component])];
}
else
{
render_temp_buf[j * 3 + 0] =
render_blend_light_check [(a | s[red_component])];
render_temp_buf[j * 3 + 1] =
render_blend_light_check [(a | s[green_component])];
render_temp_buf[j * 3 + 2] =
render_blend_light_check [(a | s[blue_component])];
}
}
else /* GIMP_PREVIEW_BG_WHITE */
{
render_temp_buf[j * 3 + 0] =
render_blend_white [(a | s[red_component])];
render_temp_buf[j * 3 + 1] =
render_blend_white [(a | s[green_component])];
render_temp_buf[j * 3 + 2] =
render_blend_white [(a | s[blue_component])];
}
}
else
{
render_temp_buf[j * 3 + 0] = s[red_component];
render_temp_buf[j * 3 + 1] = s[green_component];
render_temp_buf[j * 3 + 2] = s[blue_component];
}
s += temp_buf->bytes;
}
/* Handle the trailing transparency */
for (j = x2; j < dest_width; j++)
for (b = 0; b < dest_bytes; b++)
render_temp_buf[j * dest_bytes + b] = cb[j * 3 + b];
src += rowstride;
}
else
{
for (j = 0; j < dest_width; j++)
for (b = 0; b < dest_bytes; b++)
render_temp_buf[j * dest_bytes + b] = cb[j * 3 + b];
}
memcpy (dest_buffer + i * dest_rowstride,
render_temp_buf,
dest_width * dest_bytes);
}
}
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