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-rw-r--r--libgimpwidgets/gimppreviewarea.c1956
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpcolor/gimpcolor.h"
+
+#include "gimpwidgetstypes.h"
+
+#include "gimppreviewarea.h"
+#include "gimpwidgetsutils.h"
+
+#include "libgimp/libgimp-intl.h"
+
+
+/**
+ * SECTION: gimppreviewarea
+ * @title: GimpPreviewArea
+ * @short_description: A general purpose preview widget which caches
+ * its pixel data.
+ *
+ * A general purpose preview widget which caches its pixel data.
+ **/
+
+
+enum
+{
+ PROP_0,
+ PROP_CHECK_SIZE,
+ PROP_CHECK_TYPE
+};
+
+
+#define DEFAULT_CHECK_SIZE GIMP_CHECK_SIZE_MEDIUM_CHECKS
+#define DEFAULT_CHECK_TYPE GIMP_CHECK_TYPE_GRAY_CHECKS
+
+#define CHECK_COLOR(area, row, col) \
+ (((((area)->offset_y + (row)) & size) ^ \
+ (((area)->offset_x + (col)) & size)) ? dark : light)
+
+
+typedef struct _GimpPreviewAreaPrivate GimpPreviewAreaPrivate;
+
+struct _GimpPreviewAreaPrivate
+{
+ GimpColorConfig *config;
+ GimpColorTransform *transform;
+};
+
+#define GET_PRIVATE(obj) \
+ ((GimpPreviewAreaPrivate *) gimp_preview_area_get_instance_private ((GimpPreviewArea *) (obj)))
+
+
+static void gimp_preview_area_dispose (GObject *object);
+static void gimp_preview_area_finalize (GObject *object);
+static void gimp_preview_area_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_preview_area_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_preview_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation);
+static gboolean gimp_preview_area_expose (GtkWidget *widget,
+ GdkEventExpose *event);
+
+static void gimp_preview_area_queue_draw (GimpPreviewArea *area,
+ gint x,
+ gint y,
+ gint width,
+ gint height);
+static gint gimp_preview_area_image_type_bytes (GimpImageType type);
+
+static void gimp_preview_area_create_transform (GimpPreviewArea *area);
+static void gimp_preview_area_destroy_transform (GimpPreviewArea *area);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpPreviewArea, gimp_preview_area,
+ GTK_TYPE_DRAWING_AREA)
+
+#define parent_class gimp_preview_area_parent_class
+
+
+static void
+gimp_preview_area_class_init (GimpPreviewAreaClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->dispose = gimp_preview_area_dispose;
+ object_class->finalize = gimp_preview_area_finalize;
+ object_class->set_property = gimp_preview_area_set_property;
+ object_class->get_property = gimp_preview_area_get_property;
+
+ widget_class->size_allocate = gimp_preview_area_size_allocate;
+ widget_class->expose_event = gimp_preview_area_expose;
+
+ g_object_class_install_property (object_class, PROP_CHECK_SIZE,
+ g_param_spec_enum ("check-size",
+ _("Check Size"),
+ "The size of the checkerboard pattern indicating transparency",
+ GIMP_TYPE_CHECK_SIZE,
+ DEFAULT_CHECK_SIZE,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_CHECK_TYPE,
+ g_param_spec_enum ("check-type",
+ _("Check Style"),
+ "The colors of the checkerboard pattern indicating transparency",
+ GIMP_TYPE_CHECK_TYPE,
+ DEFAULT_CHECK_TYPE,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_preview_area_init (GimpPreviewArea *area)
+{
+ area->check_size = DEFAULT_CHECK_SIZE;
+ area->check_type = DEFAULT_CHECK_TYPE;
+ area->buf = NULL;
+ area->colormap = NULL;
+ area->offset_x = 0;
+ area->offset_y = 0;
+ area->width = 0;
+ area->height = 0;
+ area->rowstride = 0;
+ area->max_width = -1;
+ area->max_height = -1;
+
+ gimp_widget_track_monitor (GTK_WIDGET (area),
+ G_CALLBACK (gimp_preview_area_destroy_transform),
+ NULL);
+}
+
+static void
+gimp_preview_area_dispose (GObject *object)
+{
+ GimpPreviewArea *area = GIMP_PREVIEW_AREA (object);
+
+ gimp_preview_area_set_color_config (area, NULL);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_preview_area_finalize (GObject *object)
+{
+ GimpPreviewArea *area = GIMP_PREVIEW_AREA (object);
+
+ g_clear_pointer (&area->buf, g_free);
+ g_clear_pointer (&area->colormap, g_free);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_preview_area_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpPreviewArea *area = GIMP_PREVIEW_AREA (object);
+
+ switch (property_id)
+ {
+ case PROP_CHECK_SIZE:
+ area->check_size = g_value_get_enum (value);
+ break;
+ case PROP_CHECK_TYPE:
+ area->check_type = g_value_get_enum (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_preview_area_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpPreviewArea *area = GIMP_PREVIEW_AREA (object);
+
+ switch (property_id)
+ {
+ case PROP_CHECK_SIZE:
+ g_value_set_enum (value, area->check_size);
+ break;
+ case PROP_CHECK_TYPE:
+ g_value_set_enum (value, area->check_type);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_preview_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation)
+{
+ GimpPreviewArea *area = GIMP_PREVIEW_AREA (widget);
+ gint width;
+ gint height;
+
+ if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
+ GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
+
+ width = (area->max_width > 0 ?
+ MIN (allocation->width, area->max_width) : allocation->width);
+ height = (area->max_height > 0 ?
+ MIN (allocation->height, area->max_height) : allocation->height);
+
+ if (width != area->width || height != area->height)
+ {
+ if (area->buf)
+ {
+ g_free (area->buf);
+
+ area->buf = NULL;
+ area->rowstride = 0;
+ }
+
+ area->width = width;
+ area->height = height;
+ }
+}
+
+static gboolean
+gimp_preview_area_expose (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpPreviewArea *area = GIMP_PREVIEW_AREA (widget);
+ GimpPreviewAreaPrivate *priv = GET_PRIVATE (area);
+ GtkAllocation allocation;
+ GdkPixbuf *pixbuf;
+ GdkRectangle rect;
+ cairo_t *cr;
+
+ if (! area->buf)
+ return FALSE;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ rect.x = (allocation.width - area->width) / 2;
+ rect.y = (allocation.height - area->height) / 2;
+ rect.width = area->width;
+ rect.height = area->height;
+
+ if (! priv->transform)
+ gimp_preview_area_create_transform (area);
+
+ if (priv->transform)
+ {
+ const Babl *format = babl_format ("R'G'B' u8");
+ gint rowstride = ((area->width * 3) + 3) & ~3;
+ guchar *buf = g_new (guchar, rowstride * area->height);
+ guchar *src = area->buf;
+ guchar *dest = buf;
+ gint i;
+
+ for (i = 0; i < area->height; i++)
+ {
+ gimp_color_transform_process_pixels (priv->transform,
+ format, src,
+ format, dest,
+ area->width);
+
+ src += area->rowstride;
+ dest += rowstride;
+ }
+
+ pixbuf = gdk_pixbuf_new_from_data (buf,
+ GDK_COLORSPACE_RGB,
+ FALSE,
+ 8,
+ rect.width,
+ rect.height,
+ rowstride,
+ (GdkPixbufDestroyNotify) g_free, NULL);
+ }
+ else
+ {
+ pixbuf = gdk_pixbuf_new_from_data (area->buf,
+ GDK_COLORSPACE_RGB,
+ FALSE,
+ 8,
+ rect.width,
+ rect.height,
+ area->rowstride,
+ NULL, NULL);
+ }
+
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ gdk_cairo_set_source_pixbuf (cr, pixbuf, rect.x, rect.y);
+ cairo_paint (cr);
+
+ cairo_destroy (cr);
+ g_object_unref (pixbuf);
+
+ return FALSE;
+}
+
+static void
+gimp_preview_area_queue_draw (GimpPreviewArea *area,
+ gint x,
+ gint y,
+ gint width,
+ gint height)
+{
+ GtkWidget *widget = GTK_WIDGET (area);
+ GtkAllocation allocation;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ x += (allocation.width - area->width) / 2;
+ y += (allocation.height - area->height) / 2;
+
+ gtk_widget_queue_draw_area (widget, x, y, width, height);
+}
+
+static gint
+gimp_preview_area_image_type_bytes (GimpImageType type)
+{
+ switch (type)
+ {
+ case GIMP_GRAY_IMAGE:
+ case GIMP_INDEXED_IMAGE:
+ return 1;
+
+ case GIMP_GRAYA_IMAGE:
+ case GIMP_INDEXEDA_IMAGE:
+ return 2;
+
+ case GIMP_RGB_IMAGE:
+ return 3;
+
+ case GIMP_RGBA_IMAGE:
+ return 4;
+
+ default:
+ g_return_val_if_reached (0);
+ break;
+ }
+}
+
+static void
+gimp_preview_area_create_transform (GimpPreviewArea *area)
+{
+ GimpPreviewAreaPrivate *priv = GET_PRIVATE (area);
+
+ if (priv->config)
+ {
+ static GimpColorProfile *profile = NULL;
+
+ const Babl *format = babl_format ("R'G'B' u8");
+
+ if (G_UNLIKELY (! profile))
+ profile = gimp_color_profile_new_rgb_srgb ();
+
+ priv->transform = gimp_widget_get_color_transform (GTK_WIDGET (area),
+ priv->config,
+ profile,
+ format,
+ format);
+ }
+}
+
+static void
+gimp_preview_area_destroy_transform (GimpPreviewArea *area)
+{
+ GimpPreviewAreaPrivate *priv = GET_PRIVATE (area);
+
+ if (priv->transform)
+ {
+ g_object_unref (priv->transform);
+ priv->transform = NULL;
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (area));
+}
+
+
+/**
+ * gimp_preview_area_new:
+ *
+ * Creates a new #GimpPreviewArea widget.
+ *
+ * Return value: a new #GimpPreviewArea widget.
+ *
+ * Since GIMP 2.2
+ **/
+GtkWidget *
+gimp_preview_area_new (void)
+{
+ return g_object_new (GIMP_TYPE_PREVIEW_AREA, NULL);
+}
+
+/**
+ * gimp_preview_area_draw:
+ * @area: a #GimpPreviewArea widget.
+ * @x: x offset in preview
+ * @y: y offset in preview
+ * @width: buffer width
+ * @height: buffer height
+ * @type: the #GimpImageType of @buf
+ * @buf: a #guchar buffer that contains the preview pixel data.
+ * @rowstride: rowstride of @buf
+ *
+ * Draws @buf on @area and queues a redraw on the given rectangle.
+ *
+ * Since GIMP 2.2
+ **/
+void
+gimp_preview_area_draw (GimpPreviewArea *area,
+ gint x,
+ gint y,
+ gint width,
+ gint height,
+ GimpImageType type,
+ const guchar *buf,
+ gint rowstride)
+{
+ const guchar *src;
+ guchar *dest;
+ guint size;
+ guchar light;
+ guchar dark;
+ gint row;
+ gint col;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (width >= 0 && height >= 0);
+
+ if (width == 0 || height == 0)
+ return;
+
+ g_return_if_fail (buf != NULL);
+ g_return_if_fail (rowstride > 0);
+
+ if (x + width < 0 || x >= area->width)
+ return;
+
+ if (y + height < 0 || y >= area->height)
+ return;
+
+ if (x < 0)
+ {
+ gint bpp = gimp_preview_area_image_type_bytes (type);
+
+ buf -= x * bpp;
+ width += x;
+
+ x = 0;
+ }
+
+ if (x + width > area->width)
+ width = area->width - x;
+
+ if (y < 0)
+ {
+ buf -= y * rowstride;
+ height += y;
+
+ y = 0;
+ }
+
+ if (y + height > area->height)
+ height = area->height - y;
+
+ if (! area->buf)
+ {
+ area->rowstride = ((area->width * 3) + 3) & ~3;
+ area->buf = g_new (guchar, area->rowstride * area->height);
+ }
+
+ size = 1 << (2 + area->check_size);
+ gimp_checks_get_shades (area->check_type, &light, &dark);
+
+ src = buf;
+ dest = area->buf + x * 3 + y * area->rowstride;
+
+ switch (type)
+ {
+ case GIMP_RGB_IMAGE:
+ for (row = 0; row < height; row++)
+ {
+ memcpy (dest, src, 3 * width);
+
+ src += rowstride;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_RGBA_IMAGE:
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s = src;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s += 4, d+= 3)
+ {
+ switch (s[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = s[0];
+ d[1] = s[1];
+ d[2] = s[2];
+ break;
+
+ default:
+ {
+ register guint alpha = s[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (s[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (s[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (s[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+
+ src += rowstride;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_GRAY_IMAGE:
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s = src;
+ guchar *d = dest;
+
+ for (col = 0; col < width; col++, s++, d += 3)
+ {
+ d[0] = d[1] = d[2] = s[0];
+ }
+
+ src += rowstride;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_GRAYA_IMAGE:
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s = src;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s += 2, d+= 3)
+ {
+ switch (s[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = d[1] = d[2] = s[0];
+ break;
+
+ default:
+ {
+ register guint alpha = s[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = d[1] = d[2] =
+ ((check << 8) + (s[0] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+
+ src += rowstride;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_INDEXED_IMAGE:
+ g_return_if_fail (area->colormap != NULL);
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s = src;
+ guchar *d = dest;
+
+ for (col = 0; col < width; col++, s++, d += 3)
+ {
+ const guchar *colormap = area->colormap + 3 * s[0];
+
+ d[0] = colormap[0];
+ d[1] = colormap[1];
+ d[2] = colormap[2];
+ }
+
+ src += rowstride;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_INDEXEDA_IMAGE:
+ g_return_if_fail (area->colormap != NULL);
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s = src;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s += 2, d += 3)
+ {
+ const guchar *colormap = area->colormap + 3 * s[0];
+
+ switch (s[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = colormap[0];
+ d[1] = colormap[1];
+ d[2] = colormap[2];
+ break;
+
+ default:
+ {
+ register guint alpha = s[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (colormap[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (colormap[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (colormap[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+
+ src += rowstride;
+ dest += area->rowstride;
+ }
+ break;
+ }
+
+ gimp_preview_area_queue_draw (area, x, y, width, height);
+}
+
+/**
+ * gimp_preview_area_blend:
+ * @area: a #GimpPreviewArea widget.
+ * @x: x offset in preview
+ * @y: y offset in preview
+ * @width: buffer width
+ * @height: buffer height
+ * @type: the #GimpImageType of @buf1 and @buf2
+ * @buf1: a #guchar buffer that contains the pixel data for
+ * the lower layer
+ * @rowstride1: rowstride of @buf1
+ * @buf2: a #guchar buffer that contains the pixel data for
+ * the upper layer
+ * @rowstride2: rowstride of @buf2
+ * @opacity: The opacity of the first layer.
+ *
+ * Composites @buf1 on @buf2 with the given @opacity, draws the result
+ * to @area and queues a redraw on the given rectangle.
+ *
+ * Since GIMP 2.2
+ **/
+void
+gimp_preview_area_blend (GimpPreviewArea *area,
+ gint x,
+ gint y,
+ gint width,
+ gint height,
+ GimpImageType type,
+ const guchar *buf1,
+ gint rowstride1,
+ const guchar *buf2,
+ gint rowstride2,
+ guchar opacity)
+{
+ const guchar *src1;
+ const guchar *src2;
+ guchar *dest;
+ guint size;
+ guchar light;
+ guchar dark;
+ gint row;
+ gint col;
+ gint i;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (width >= 0 && height >= 0);
+
+ if (width == 0 || height == 0)
+ return;
+
+ g_return_if_fail (buf1 != NULL);
+ g_return_if_fail (buf2 != NULL);
+ g_return_if_fail (rowstride1 > 0);
+ g_return_if_fail (rowstride2 > 0);
+
+ switch (opacity)
+ {
+ case 0:
+ gimp_preview_area_draw (area, x, y, width, height,
+ type, buf1, rowstride1);
+ return;
+
+ case 255:
+ gimp_preview_area_draw (area, x, y, width, height,
+ type, buf2, rowstride2);
+ return;
+
+ default:
+ break;
+ }
+
+ if (x + width < 0 || x >= area->width)
+ return;
+
+ if (y + height < 0 || y >= area->height)
+ return;
+
+ if (x < 0)
+ {
+ gint bpp = gimp_preview_area_image_type_bytes (type);
+
+ buf1 -= x * bpp;
+ buf2 -= x * bpp;
+ width += x;
+
+ x = 0;
+ }
+
+ if (x + width > area->width)
+ width = area->width - x;
+
+ if (y < 0)
+ {
+ buf1 -= y * rowstride1;
+ buf2 -= y * rowstride2;
+ height += y;
+
+ y = 0;
+ }
+
+ if (y + height > area->height)
+ height = area->height - y;
+
+ if (! area->buf)
+ {
+ area->rowstride = ((area->width * 3) + 3) & ~3;
+ area->buf = g_new (guchar, area->rowstride * area->height);
+ }
+
+ size = 1 << (2 + area->check_size);
+ gimp_checks_get_shades (area->check_type, &light, &dark);
+
+ src1 = buf1;
+ src2 = buf2;
+ dest = area->buf + x * 3 + y * area->rowstride;
+
+ switch (type)
+ {
+ case GIMP_RGB_IMAGE:
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 3, s2 += 3, d+= 3)
+ {
+ d[0] = ((s1[0] << 8) + (s2[0] - s1[0]) * opacity) >> 8;
+ d[1] = ((s1[1] << 8) + (s2[1] - s1[1]) * opacity) >> 8;
+ d[2] = ((s1[2] << 8) + (s2[2] - s1[2]) * opacity) >> 8;
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_RGBA_IMAGE:
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 4, s2 += 4, d+= 3)
+ {
+ guchar inter[4];
+
+ if (s1[3] == s2[3])
+ {
+ inter[0] = ((s1[0] << 8) + (s2[0] - s1[0]) * opacity) >> 8;
+ inter[1] = ((s1[1] << 8) + (s2[1] - s1[1]) * opacity) >> 8;
+ inter[2] = ((s1[2] << 8) + (s2[2] - s1[2]) * opacity) >> 8;
+ inter[3] = s1[3];
+ }
+ else
+ {
+ inter[3] = ((s1[3] << 8) + (s2[3] - s1[3]) * opacity) >> 8;
+
+ if (inter[3])
+ {
+ for (i = 0; i < 3; i++)
+ {
+ gushort a = s1[i] * s1[3];
+ gushort b = s2[i] * s2[3];
+
+ inter[i] =
+ (((a << 8) + (b - a) * opacity) >> 8) / inter[3];
+ }
+ }
+ }
+
+ switch (inter[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = inter[0];
+ d[1] = inter[1];
+ d[2] = inter[2];
+ break;
+
+ default:
+ {
+ register guint alpha = inter[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (inter[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (inter[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (inter[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_GRAY_IMAGE:
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ guchar *d = dest;
+
+ for (col = 0; col < width; col++, s1++, s2++, d += 3)
+ {
+ d[0] = d[1] = d[2] =
+ ((s1[0] << 8) + (s2[0] - s1[0]) * opacity) >> 8;
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_GRAYA_IMAGE:
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 2, s2 += 2, d+= 3)
+ {
+ guchar inter[2] = { 0, };
+
+ if (s1[1] == s2[1])
+ {
+ inter[0] = ((s1[0] << 8) + (s2[0] - s1[0]) * opacity) >> 8;
+ inter[1] = s1[1];
+ }
+ else
+ {
+ inter[1] = ((s1[1] << 8) + (s2[1] - s1[1]) * opacity) >> 8;
+
+ if (inter[1])
+ {
+ gushort a = s1[0] * s1[1];
+ gushort b = s2[0] * s2[1];
+
+ inter[0] =
+ (((a << 8) + (b - a) * opacity) >> 8) / inter[1];
+ }
+ }
+
+ switch (inter[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = d[1] = d[2] = inter[0];
+ break;
+
+ default:
+ {
+ register guint alpha = inter[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = d[1] = d[2] =
+ ((check << 8) + (inter[0] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_INDEXED_IMAGE:
+ g_return_if_fail (area->colormap != NULL);
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ guchar *d = dest;
+
+ for (col = 0; col < width; col++, s1++, s2++, d += 3)
+ {
+ const guchar *cmap1 = area->colormap + 3 * s1[0];
+ const guchar *cmap2 = area->colormap + 3 * s2[0];
+
+ d[0] = ((cmap1[0] << 8) + (cmap2[0] - cmap1[0]) * opacity) >> 8;
+ d[1] = ((cmap1[1] << 8) + (cmap2[1] - cmap1[1]) * opacity) >> 8;
+ d[2] = ((cmap1[2] << 8) + (cmap2[2] - cmap1[2]) * opacity) >> 8;
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_INDEXEDA_IMAGE:
+ g_return_if_fail (area->colormap != NULL);
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 2, s2 += 2, d += 3)
+ {
+ const guchar *cmap1 = area->colormap + 3 * s1[0];
+ const guchar *cmap2 = area->colormap + 3 * s2[0];
+ guchar inter[4];
+
+ if (s1[1] == s2[1])
+ {
+ inter[0] = (((cmap1[0] << 8) +
+ (cmap2[0] - cmap1[0]) * opacity) >> 8);
+ inter[1] = (((cmap1[1] << 8) +
+ (cmap2[1] - cmap1[1]) * opacity) >> 8);
+ inter[2] = (((cmap1[2] << 8) +
+ (cmap2[2] - cmap1[2]) * opacity) >> 8);
+ inter[3] = s1[1];
+ }
+ else
+ {
+ inter[3] = ((s1[1] << 8) + (s2[1] - s1[1]) * opacity) >> 8;
+
+ if (inter[3])
+ {
+ for (i = 0; i < 3; i++)
+ {
+ gushort a = cmap1[i] * s1[1];
+ gushort b = cmap2[i] * s2[1];
+
+ inter[i] =
+ (((a << 8) + (b - a) * opacity) >> 8) / inter[3];
+ }
+ }
+ }
+
+ switch (inter[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = inter[0];
+ d[1] = inter[1];
+ d[2] = inter[2];
+ break;
+
+ default:
+ {
+ register guint alpha = inter[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (inter[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (inter[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (inter[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ dest += area->rowstride;
+ }
+ break;
+ }
+
+ gimp_preview_area_queue_draw (area, x, y, width, height);
+}
+
+/**
+ * gimp_preview_area_mask:
+ * @area: a #GimpPreviewArea widget.
+ * @x: x offset in preview
+ * @y: y offset in preview
+ * @width: buffer width
+ * @height: buffer height
+ * @type: the #GimpImageType of @buf1 and @buf2
+ * @buf1: a #guchar buffer that contains the pixel data for
+ * the lower layer
+ * @rowstride1: rowstride of @buf1
+ * @buf2: a #guchar buffer that contains the pixel data for
+ * the upper layer
+ * @rowstride2: rowstride of @buf2
+ * @mask: a #guchar buffer representing the mask of the second
+ * layer.
+ * @rowstride_mask: rowstride for the mask.
+ *
+ * Composites @buf1 on @buf2 with the given @mask, draws the result on
+ * @area and queues a redraw on the given rectangle.
+ *
+ * Since GIMP 2.2
+ **/
+void
+gimp_preview_area_mask (GimpPreviewArea *area,
+ gint x,
+ gint y,
+ gint width,
+ gint height,
+ GimpImageType type,
+ const guchar *buf1,
+ gint rowstride1,
+ const guchar *buf2,
+ gint rowstride2,
+ const guchar *mask,
+ gint rowstride_mask)
+{
+ const guchar *src1;
+ const guchar *src2;
+ const guchar *src_mask;
+ guchar *dest;
+ guint size;
+ guchar light;
+ guchar dark;
+ gint row;
+ gint col;
+ gint i;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (width >= 0 && height >= 0);
+
+ if (width == 0 || height == 0)
+ return;
+
+ g_return_if_fail (buf1 != NULL);
+ g_return_if_fail (buf2 != NULL);
+ g_return_if_fail (mask != NULL);
+ g_return_if_fail (rowstride1 > 0);
+ g_return_if_fail (rowstride2 > 0);
+ g_return_if_fail (rowstride_mask > 0);
+
+ if (x + width < 0 || x >= area->width)
+ return;
+
+ if (y + height < 0 || y >= area->height)
+ return;
+
+ if (x < 0)
+ {
+ gint bpp = gimp_preview_area_image_type_bytes (type);
+
+ buf1 -= x * bpp;
+ buf2 -= x * bpp;
+ mask -= x;
+ width += x;
+
+ x = 0;
+ }
+
+ if (x + width > area->width)
+ width = area->width - x;
+
+ if (y < 0)
+ {
+ buf1 -= y * rowstride1;
+ buf2 -= y * rowstride2;
+ mask -= y * rowstride_mask;
+ height += y;
+
+ y = 0;
+ }
+
+ if (y + height > area->height)
+ height = area->height - y;
+
+ if (! area->buf)
+ {
+ area->rowstride = ((area->width * 3) + 3) & ~3;
+ area->buf = g_new (guchar, area->rowstride * area->height);
+ }
+
+ size = 1 << (2 + area->check_size);
+ gimp_checks_get_shades (area->check_type, &light, &dark);
+
+ src1 = buf1;
+ src2 = buf2;
+ src_mask = mask;
+ dest = area->buf + x * 3 + y * area->rowstride;
+
+ switch (type)
+ {
+ case GIMP_RGB_IMAGE:
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ const guchar *m = src_mask;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 3, s2 += 3, m++, d+= 3)
+ {
+ d[0] = ((s1[0] << 8) + (s2[0] - s1[0]) * m[0]) >> 8;
+ d[1] = ((s1[1] << 8) + (s2[1] - s1[1]) * m[0]) >> 8;
+ d[2] = ((s1[2] << 8) + (s2[2] - s1[2]) * m[0]) >> 8;
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ src_mask += rowstride_mask;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_RGBA_IMAGE:
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ const guchar *m = src_mask;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 4, s2 += 4, m++, d+= 3)
+ {
+ switch (m[0])
+ {
+ case 0:
+ switch (s1[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = s1[0];
+ d[1] = s1[1];
+ d[2] = s1[2];
+ break;
+
+ default:
+ {
+ register guint alpha = s1[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (s1[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (s1[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (s1[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ break;
+
+ case 255:
+ switch (s2[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = s2[0];
+ d[1] = s2[1];
+ d[2] = s2[2];
+ break;
+
+ default:
+ {
+ register guint alpha = s2[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (s2[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (s2[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (s2[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ break;
+
+ default:
+ {
+ guchar inter[4];
+
+ if (s1[3] == s2[3])
+ {
+ inter[0] = ((s1[0] << 8) + (s2[0] - s1[0]) * m[0]) >> 8;
+ inter[1] = ((s1[1] << 8) + (s2[1] - s1[1]) * m[0]) >> 8;
+ inter[2] = ((s1[2] << 8) + (s2[2] - s1[2]) * m[0]) >> 8;
+ inter[3] = s1[3];
+ }
+ else
+ {
+ inter[3] = ((s1[3] << 8) + (s2[3] - s1[3]) * m[0]) >> 8;
+
+ if (inter[3])
+ {
+ for (i = 0; i < 3; i++)
+ {
+ gushort a = s1[i] * s1[3];
+ gushort b = s2[i] * s2[3];
+
+ inter[i] =
+ (((a << 8) + (b - a) * m[0]) >> 8) / inter[3];
+ }
+ }
+ }
+
+ switch (inter[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = inter[0];
+ d[1] = inter[1];
+ d[2] = inter[2];
+ break;
+
+ default:
+ {
+ register guint alpha = inter[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = (((check << 8) +
+ (inter[0] - check) * alpha) >> 8);
+ d[1] = (((check << 8) +
+ (inter[1] - check) * alpha) >> 8);
+ d[2] = (((check << 8) +
+ (inter[2] - check) * alpha) >> 8);
+ }
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ src_mask += rowstride_mask;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_GRAY_IMAGE:
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ const guchar *m = src_mask;
+ guchar *d = dest;
+
+ for (col = 0; col < width; col++, s1++, s2++, m++, d += 3)
+ d[0] = d[1] = d[2] = ((s1[0] << 8) + (s2[0] - s1[0]) * m[0]) >> 8;
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ src_mask += rowstride_mask;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_GRAYA_IMAGE:
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ const guchar *m = src_mask;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 2, s2 += 2, m++, d+= 3)
+ {
+ switch (m[0])
+ {
+ case 0:
+ switch (s1[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = d[1] = d[2] = s1[0];
+ break;
+
+ default:
+ {
+ register guint alpha = s1[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = d[1] = d[2] =
+ ((check << 8) + (s1[0] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ break;
+
+ case 255:
+ switch (s2[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = d[1] = d[2] = s2[0];
+ break;
+
+ default:
+ {
+ register guint alpha = s2[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = d[1] = d[2] =
+ ((check << 8) + (s2[0] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ break;
+
+ default:
+ {
+ guchar inter[2] = { 0, };
+
+ if (s1[1] == s2[1])
+ {
+ inter[0] = ((s1[0] << 8) + (s2[0] - s1[0]) * m[0]) >> 8;
+ inter[1] = s1[1];
+ }
+ else
+ {
+ inter[1] = ((s1[1] << 8) + (s2[1] - s1[1]) * m[0]) >> 8;
+
+ if (inter[1])
+ {
+ gushort a = s1[0] * s1[1];
+ gushort b = s2[0] * s2[1];
+
+ inter[0] =
+ (((a << 8) + (b - a) * m[0]) >> 8) / inter[1];
+ }
+ }
+
+ switch (inter[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = d[1] = d[2] = inter[0];
+ break;
+
+ default:
+ {
+ register guint alpha = inter[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = d[1] = d[2] =
+ ((check << 8) + (inter[0] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ src_mask += rowstride_mask;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_INDEXED_IMAGE:
+ g_return_if_fail (area->colormap != NULL);
+ for (row = 0; row < height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ const guchar *m = src_mask;
+ guchar *d = dest;
+
+ for (col = 0; col < width; col++, s1++, s2++, m++, d += 3)
+ {
+ const guchar *cmap1 = area->colormap + 3 * s1[0];
+ const guchar *cmap2 = area->colormap + 3 * s2[0];
+
+ d[0] = ((cmap1[0] << 8) + (cmap2[0] - cmap1[0]) * m[0]) >> 8;
+ d[1] = ((cmap1[1] << 8) + (cmap2[1] - cmap1[1]) * m[0]) >> 8;
+ d[2] = ((cmap1[2] << 8) + (cmap2[2] - cmap1[2]) * m[0]) >> 8;
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ src_mask += rowstride_mask;
+ dest += area->rowstride;
+ }
+ break;
+
+ case GIMP_INDEXEDA_IMAGE:
+ g_return_if_fail (area->colormap != NULL);
+ for (row = y; row < y + height; row++)
+ {
+ const guchar *s1 = src1;
+ const guchar *s2 = src2;
+ const guchar *m = src_mask;
+ guchar *d = dest;
+
+ for (col = x; col < x + width; col++, s1 += 2, s2 += 2, m++, d += 3)
+ {
+ const guchar *cmap1 = area->colormap + 3 * s1[0];
+ const guchar *cmap2 = area->colormap + 3 * s2[0];
+
+ switch (m[0])
+ {
+ case 0:
+ switch (s1[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = cmap1[0];
+ d[1] = cmap1[1];
+ d[2] = cmap1[2];
+ break;
+
+ default:
+ {
+ register guint alpha = s1[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (cmap1[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (cmap1[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (cmap1[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ break;
+
+ case 255:
+ switch (s2[1])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = cmap2[0];
+ d[1] = cmap2[1];
+ d[2] = cmap2[2];
+ break;
+
+ default:
+ {
+ register guint alpha = s2[1] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] = ((check << 8) + (cmap2[0] - check) * alpha) >> 8;
+ d[1] = ((check << 8) + (cmap2[1] - check) * alpha) >> 8;
+ d[2] = ((check << 8) + (cmap2[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ break;
+
+ default:
+ {
+ guchar inter[4];
+
+ if (s1[1] == s2[1])
+ {
+ inter[0] = (((cmap1[0] << 8) +
+ (cmap2[0] - cmap1[0]) * m[0]) >> 8);
+ inter[1] = (((cmap1[1] << 8) +
+ (cmap2[1] - cmap1[1]) * m[0]) >> 8);
+ inter[2] = (((cmap1[2] << 8) +
+ (cmap2[2] - cmap1[2]) * m[0]) >> 8);
+ inter[3] = s1[1];
+ }
+ else
+ {
+ inter[3] = ((s1[1] << 8) + (s2[1] - s1[1]) * m[0]) >> 8;
+
+ if (inter[3])
+ {
+ for (i = 0 ; i < 3 ; i++)
+ {
+ gushort a = cmap1[i] * s1[1];
+ gushort b = cmap2[i] * s2[1];
+
+ inter[i] = ((((a << 8) + (b - a) * m[0]) >> 8)
+ / inter[3]);
+ }
+ }
+ }
+
+ switch (inter[3])
+ {
+ case 0:
+ d[0] = d[1] = d[2] = CHECK_COLOR (area, row, col);
+ break;
+
+ case 255:
+ d[0] = inter[0];
+ d[1] = inter[1];
+ d[2] = inter[2];
+ break;
+
+ default:
+ {
+ register guint alpha = inter[3] + 1;
+ register guint check = CHECK_COLOR (area, row, col);
+
+ d[0] =
+ ((check << 8) + (inter[0] - check) * alpha) >> 8;
+ d[1] =
+ ((check << 8) + (inter[1] - check) * alpha) >> 8;
+ d[2] =
+ ((check << 8) + (inter[2] - check) * alpha) >> 8;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ src1 += rowstride1;
+ src2 += rowstride2;
+ src_mask += rowstride_mask;
+ dest += area->rowstride;
+ }
+ break;
+ }
+
+ gimp_preview_area_queue_draw (area, x, y, width, height);
+}
+
+/**
+ * gimp_preview_area_fill:
+ * @area: a #GimpPreviewArea widget.
+ * @x: x offset in preview
+ * @y: y offset in preview
+ * @width: width of the rectangle to fill
+ * @height: height of the rectangle to fill
+ * @red: red component of the fill color (0-255)
+ * @green: green component of the fill color (0-255)
+ * @blue: red component of the fill color (0-255)
+ *
+ * Fills the given rectangle of @area in the given color and queues a
+ * redraw.
+ *
+ * Since GIMP 2.2
+ **/
+void
+gimp_preview_area_fill (GimpPreviewArea *area,
+ gint x,
+ gint y,
+ gint width,
+ gint height,
+ guchar red,
+ guchar green,
+ guchar blue)
+{
+ guchar *dest;
+ guchar *d;
+ gint row;
+ gint col;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (width >= 0 && height >= 0);
+
+ if (width == 0 || height == 0)
+ return;
+
+ if (x + width < 0 || x >= area->width)
+ return;
+
+ if (y + height < 0 || y >= area->height)
+ return;
+
+ if (x < 0)
+ {
+ width += x;
+ x = 0;
+ }
+
+ if (x + width > area->width)
+ width = area->width - x;
+
+ if (y < 0)
+ {
+ height += y;
+ y = 0;
+ }
+
+ if (y + height > area->height)
+ height = area->height - y;
+
+ if (! area->buf)
+ {
+ area->rowstride = ((area->width * 3) + 3) & ~3;
+ area->buf = g_new (guchar, area->rowstride * area->height);
+ }
+
+ dest = area->buf + x * 3 + y * area->rowstride;
+
+ /* colorize first row */
+ for (col = 0, d = dest; col < width; col++, d+= 3)
+ {
+ d[0] = red;
+ d[1] = green;
+ d[2] = blue;
+ }
+
+ /* copy first row to remaining rows */
+ for (row = 1, d = dest; row < height; row++)
+ {
+ d += area->rowstride;
+ memcpy (d, dest, width * 3);
+ }
+
+ gimp_preview_area_queue_draw (area, x, y, width, height);
+}
+
+/**
+ * gimp_preview_area_set_offsets:
+ * @area: a #GimpPreviewArea
+ * @x: horizontal offset
+ * @y: vertical offset
+ *
+ * Sets the offsets of the previewed area. This information is used
+ * when drawing the checkerboard and to determine the dither offsets.
+ *
+ * Since: 2.2
+ **/
+void
+gimp_preview_area_set_offsets (GimpPreviewArea *area,
+ gint x,
+ gint y)
+{
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+
+ area->offset_x = x;
+ area->offset_y = y;
+}
+
+/**
+ * gimp_preview_area_set_colormap:
+ * @area: a #GimpPreviewArea
+ * @colormap: a #guchar buffer that contains the colormap
+ * @num_colors: the number of colors in the colormap
+ *
+ * Sets the colormap for the #GimpPreviewArea widget. You need to
+ * call this function before you use gimp_preview_area_draw() with
+ * an image type of %GIMP_INDEXED_IMAGE or %GIMP_INDEXEDA_IMAGE.
+ *
+ * Since GIMP 2.2
+ **/
+void
+gimp_preview_area_set_colormap (GimpPreviewArea *area,
+ const guchar *colormap,
+ gint num_colors)
+{
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (colormap != NULL || num_colors == 0);
+ g_return_if_fail (num_colors >= 0 && num_colors <= 256);
+
+ if (num_colors > 0)
+ {
+ if (area->colormap)
+ memset (area->colormap, 0, 3 * 256);
+ else
+ area->colormap = g_new0 (guchar, 3 * 256);
+
+ memcpy (area->colormap, colormap, 3 * num_colors);
+ }
+ else
+ {
+ g_free (area->colormap);
+ area->colormap = NULL;
+ }
+}
+
+/**
+ * gimp_preview_area_set_color_config:
+ * @area: a #GimpPreviewArea widget.
+ * @config: a #GimpColorConfig object.
+ *
+ * Sets the color management configuration to use with this preview area.
+ *
+ * Since: 2.10
+ */
+void
+gimp_preview_area_set_color_config (GimpPreviewArea *area,
+ GimpColorConfig *config)
+{
+ GimpPreviewAreaPrivate *priv;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (config == NULL || GIMP_IS_COLOR_CONFIG (config));
+
+ priv = GET_PRIVATE (area);
+
+ if (config != priv->config)
+ {
+ if (priv->config)
+ {
+ g_signal_handlers_disconnect_by_func (priv->config,
+ gimp_preview_area_destroy_transform,
+ area);
+
+ gimp_preview_area_destroy_transform (area);
+ }
+
+ g_set_object (&priv->config, config);
+
+ if (priv->config)
+ {
+ g_signal_connect_swapped (priv->config, "notify",
+ G_CALLBACK (gimp_preview_area_destroy_transform),
+ area);
+ }
+ }
+}
+
+/**
+ * gimp_preview_area_set_max_size:
+ * @area: a #GimpPreviewArea widget
+ * @width: the maximum width in pixels or -1 to unset the limit
+ * @height: the maximum height in pixels or -1 to unset the limit
+ *
+ * Usually a #GimpPreviewArea fills the size that it is
+ * allocated. This function allows you to limit the preview area to a
+ * maximum size. If a larger size is allocated for the widget, the
+ * preview will draw itself centered into the allocated area.
+ *
+ * Since: 2.2
+ **/
+void
+gimp_preview_area_set_max_size (GimpPreviewArea *area,
+ gint width,
+ gint height)
+{
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+
+ area->max_width = width;
+ area->max_height = height;
+}
+
+
+
+/* popup menu */
+
+static void
+gimp_preview_area_menu_toggled (GtkWidget *item,
+ GimpPreviewArea *area)
+{
+ gboolean active = gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (item));
+
+ if (active)
+ {
+ const gchar *name = g_object_get_data (G_OBJECT (item),
+ "gimp-preview-area-prop-name");
+ if (name)
+ {
+ gint value =
+ GPOINTER_TO_INT (g_object_get_data (G_OBJECT (item),
+ "gimp-preview-area-prop-value"));
+ g_object_set (area,
+ name, value,
+ NULL);
+ }
+ }
+}
+
+static GtkWidget *
+gimp_preview_area_menu_new (GimpPreviewArea *area,
+ const gchar *property)
+{
+ GParamSpec *pspec;
+ GEnumClass *enum_class;
+ GEnumValue *enum_value;
+ GtkWidget *menu;
+ GtkWidget *item;
+ GSList *group = NULL;
+ gint value;
+
+ pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (area), property);
+
+ g_return_val_if_fail (G_IS_PARAM_SPEC_ENUM (pspec), NULL);
+
+ g_object_get (area,
+ property, &value,
+ NULL);
+
+ enum_class = G_PARAM_SPEC_ENUM (pspec)->enum_class;
+
+ menu = gtk_menu_new ();
+
+ for (enum_value = enum_class->values; enum_value->value_name; enum_value++)
+ {
+ const gchar *name = gimp_enum_value_get_desc (enum_class, enum_value);
+
+ item = gtk_radio_menu_item_new_with_label (group, name);
+
+ gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+ gtk_widget_show (item);
+
+ g_object_set_data (G_OBJECT (item),
+ "gimp-preview-area-prop-name",
+ (gpointer) property);
+
+ g_object_set_data (G_OBJECT (item),
+ "gimp-preview-area-prop-value",
+ GINT_TO_POINTER (enum_value->value));
+
+ gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (item),
+ (enum_value->value == value));
+
+ g_signal_connect (item, "toggled",
+ G_CALLBACK (gimp_preview_area_menu_toggled),
+ area);
+
+ group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (item));
+ }
+
+ item = gtk_menu_item_new_with_label (g_param_spec_get_nick (pspec));
+
+ gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), menu);
+
+ gtk_widget_show (item);
+
+ return item;
+}
+
+/**
+ * gimp_preview_area_menu_popup:
+ * @area: a #GimpPreviewArea
+ * @event: the button event that causes the menu to popup or %NULL
+ *
+ * Creates a popup menu that allows one to configure the size and type of
+ * the checkerboard pattern that the @area uses to visualize transparency.
+ *
+ * Since: 2.2
+ **/
+void
+gimp_preview_area_menu_popup (GimpPreviewArea *area,
+ GdkEventButton *event)
+{
+ GtkWidget *menu;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+
+ menu = gtk_menu_new ();
+ gtk_menu_set_screen (GTK_MENU (menu),
+ gtk_widget_get_screen (GTK_WIDGET (area)));
+
+ gtk_menu_shell_append (GTK_MENU_SHELL (menu),
+ gimp_preview_area_menu_new (area, "check-type"));
+ gtk_menu_shell_append (GTK_MENU_SHELL (menu),
+ gimp_preview_area_menu_new (area, "check-size"));
+
+ if (event)
+ gtk_menu_popup (GTK_MENU (menu),
+ NULL, NULL, NULL, NULL, event->button, event->time);
+ else
+ gtk_menu_popup (GTK_MENU (menu),
+ NULL, NULL, NULL, NULL, 0, gtk_get_current_event_time ());
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-20 16:36:33 +0000