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Diffstat (limited to 'plug-ins/print/print-preview.c')
| -rw-r--r-- | plug-ins/print/print-preview.c | 880 |
1 files changed, 880 insertions, 0 deletions
diff --git a/plug-ins/print/print-preview.c b/plug-ins/print/print-preview.c new file mode 100644 index 0000000..366a4c4 --- /dev/null +++ b/plug-ins/print/print-preview.c @@ -0,0 +1,880 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * 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 <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <libgimp/gimp.h> +#include <libgimp/gimpui.h> + +#include "print-preview.h" + + +enum +{ + OFFSETS_CHANGED, + LAST_SIGNAL +}; + + +#define SIZE_REQUEST 200 + + +struct _PrintPreview +{ + GtkEventBox parent_instance; + + GdkCursor *cursor; + + GtkPageSetup *page; + cairo_surface_t *thumbnail; + gboolean dragging; + gboolean inside; + + gint32 drawable_id; + + gdouble image_offset_x; + gdouble image_offset_y; + gdouble image_offset_x_max; + gdouble image_offset_y_max; + gdouble image_width; + gdouble image_height; + + gboolean use_full_page; + + /* for mouse drags */ + gdouble orig_offset_x; + gdouble orig_offset_y; + gint start_x; + gint start_y; +}; + +struct _PrintPreviewClass +{ + GtkEventBoxClass parent_class; + + void (* offsets_changed) (PrintPreview *print_preview, + gint offset_x, + gint offset_y); +}; + + +static void print_preview_finalize (GObject *object); + +static void print_preview_realize (GtkWidget *widget); +static void print_preview_unrealize (GtkWidget *widget); +static void print_preview_size_request (GtkWidget *widget, + GtkRequisition *requisition); +static void print_preview_size_allocate (GtkWidget *widget, + GtkAllocation *allocation); +static gboolean print_preview_expose_event (GtkWidget *widget, + GdkEventExpose *event); +static gboolean print_preview_button_press_event (GtkWidget *widget, + GdkEventButton *event); +static gboolean print_preview_button_release_event (GtkWidget *widget, + GdkEventButton *event); +static gboolean print_preview_motion_notify_event (GtkWidget *widget, + GdkEventMotion *event); +static gboolean print_preview_leave_notify_event (GtkWidget *widget, + GdkEventCrossing *event); + +static gboolean print_preview_is_inside (PrintPreview *preview, + gdouble x, + gdouble y); +static void print_preview_set_inside (PrintPreview *preview, + gboolean inside); + +static gdouble print_preview_get_scale (PrintPreview *preview); + +static void print_preview_get_page_size (PrintPreview *preview, + gdouble *paper_width, + gdouble *paper_height); +static void print_preview_get_page_margins (PrintPreview *preview, + gdouble *left_margin, + gdouble *right_margin, + gdouble *top_margin, + gdouble *bottom_margin); +static cairo_surface_t * print_preview_get_thumbnail (gint32 drawable_id, + gint width, + gint height); + + +G_DEFINE_TYPE (PrintPreview, print_preview, GTK_TYPE_EVENT_BOX) + +#define parent_class print_preview_parent_class + +static guint print_preview_signals[LAST_SIGNAL] = { 0 }; + + +#define g_marshal_value_peek_double(v) (v)->data[0].v_double + +static void +marshal_VOID__DOUBLE_DOUBLE (GClosure *closure, + GValue *return_value, + guint n_param_values, + const GValue *param_values, + gpointer invocation_hint, + gpointer marshal_data) +{ + typedef void (*GMarshalFunc_VOID__DOUBLE_DOUBLE) (gpointer data1, + gdouble arg_1, + gdouble arg_2, + gpointer data2); + register GMarshalFunc_VOID__DOUBLE_DOUBLE callback; + register GCClosure *cc = (GCClosure*) closure; + register gpointer data1, data2; + + g_return_if_fail (n_param_values == 3); + + if (G_CCLOSURE_SWAP_DATA (closure)) + { + data1 = closure->data; + data2 = g_value_peek_pointer (param_values + 0); + } + else + { + data1 = g_value_peek_pointer (param_values + 0); + data2 = closure->data; + } + + callback = (GMarshalFunc_VOID__DOUBLE_DOUBLE) (marshal_data ? + marshal_data : cc->callback); + + callback (data1, + g_marshal_value_peek_double (param_values + 1), + g_marshal_value_peek_double (param_values + 2), + data2); +} + +static void +print_preview_class_init (PrintPreviewClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); + + print_preview_signals[OFFSETS_CHANGED] = + g_signal_new ("offsets-changed", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_FIRST, + G_STRUCT_OFFSET (PrintPreviewClass, offsets_changed), + NULL, NULL, + marshal_VOID__DOUBLE_DOUBLE, + G_TYPE_NONE, 2, + G_TYPE_DOUBLE, + G_TYPE_DOUBLE); + + object_class->finalize = print_preview_finalize; + + widget_class->realize = print_preview_realize; + widget_class->unrealize = print_preview_unrealize; + widget_class->size_request = print_preview_size_request; + widget_class->size_allocate = print_preview_size_allocate; + widget_class->expose_event = print_preview_expose_event; + widget_class->button_press_event = print_preview_button_press_event; + widget_class->button_release_event = print_preview_button_release_event; + widget_class->motion_notify_event = print_preview_motion_notify_event; + widget_class->leave_notify_event = print_preview_leave_notify_event; + + klass->offsets_changed = NULL; +} + +static void +print_preview_init (PrintPreview *preview) +{ + gtk_event_box_set_visible_window (GTK_EVENT_BOX (preview), FALSE); + + gtk_widget_add_events (GTK_WIDGET (preview), + GDK_BUTTON_PRESS_MASK | + GDK_BUTTON_RELEASE_MASK | + GDK_POINTER_MOTION_MASK); +} + + +static void +print_preview_finalize (GObject *object) +{ + PrintPreview *preview = PRINT_PREVIEW (object); + + if (preview->thumbnail) + { + cairo_surface_destroy (preview->thumbnail); + preview->thumbnail = NULL; + } + + if (preview->page) + { + g_object_unref (preview->page); + preview->page = NULL; + } + + G_OBJECT_CLASS (print_preview_parent_class)->finalize (object); +} + +static void +print_preview_realize (GtkWidget *widget) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + GTK_WIDGET_CLASS (print_preview_parent_class)->realize (widget); + + preview->cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget), + GDK_HAND1); +} + +static void +print_preview_unrealize (GtkWidget *widget) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + if (preview->cursor) + gdk_cursor_unref (preview->cursor); + + GTK_WIDGET_CLASS (print_preview_parent_class)->unrealize (widget); +} + +static void +print_preview_size_request (GtkWidget *widget, + GtkRequisition *requisition) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + gdouble paper_width; + gdouble paper_height; + gint border; + + border = gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1; + + print_preview_get_page_size (preview, &paper_width, &paper_height); + + if (paper_width > paper_height) + { + requisition->height = SIZE_REQUEST; + requisition->width = paper_width * SIZE_REQUEST / paper_height; + requisition->width = MIN (requisition->width, 2 * SIZE_REQUEST); + } + else + { + requisition->width = SIZE_REQUEST; + requisition->height = paper_height * SIZE_REQUEST / paper_width; + requisition->height = MIN (requisition->height, 2 * SIZE_REQUEST); + } + + requisition->width += 2 * border; + requisition->height += 2 * border; +} + +static void +print_preview_size_allocate (GtkWidget *widget, + GtkAllocation *allocation) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + GTK_WIDGET_CLASS (print_preview_parent_class)->size_allocate (widget, + allocation); + + if (preview->thumbnail) + { + cairo_surface_destroy (preview->thumbnail); + preview->thumbnail = NULL; + } +} + +static gboolean +print_preview_button_press_event (GtkWidget *widget, + GdkEventButton *event) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + if (event->type == GDK_BUTTON_PRESS && event->button == 1 && preview->inside) + { + GdkCursor *cursor; + + cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget), + GDK_FLEUR); + + if (gdk_pointer_grab (event->window, FALSE, + (GDK_BUTTON1_MOTION_MASK | + GDK_BUTTON_RELEASE_MASK), + NULL, cursor, event->time) == GDK_GRAB_SUCCESS) + { + preview->orig_offset_x = preview->image_offset_x; + preview->orig_offset_y = preview->image_offset_y; + + preview->start_x = event->x; + preview->start_y = event->y; + + preview->dragging = TRUE; + } + + gdk_cursor_unref (cursor); + } + + return FALSE; +} + +static gboolean +print_preview_button_release_event (GtkWidget *widget, + GdkEventButton *event) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + if (preview->dragging) + { + gdk_display_pointer_ungrab (gtk_widget_get_display (widget), + event->time); + preview->dragging = FALSE; + + print_preview_set_inside (preview, + print_preview_is_inside (preview, + event->x, event->y)); + } + + return FALSE; +} + +static gboolean +print_preview_motion_notify_event (GtkWidget *widget, + GdkEventMotion *event) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + if (preview->dragging) + { + gdouble scale = print_preview_get_scale (preview); + gdouble offset_x; + gdouble offset_y; + + offset_x = (preview->orig_offset_x + + (event->x - preview->start_x) / scale); + offset_y = (preview->orig_offset_y + + (event->y - preview->start_y) / scale); + + offset_x = CLAMP (offset_x, 0, preview->image_offset_x_max); + offset_y = CLAMP (offset_y, 0, preview->image_offset_y_max); + + if (preview->image_offset_x != offset_x || + preview->image_offset_y != offset_y) + { + print_preview_set_image_offsets (preview, offset_x, offset_y); + + g_signal_emit (preview, + print_preview_signals[OFFSETS_CHANGED], 0, + preview->image_offset_x, + preview->image_offset_y); + } + } + else + { + print_preview_set_inside (preview, + print_preview_is_inside (preview, + event->x, event->y)); + } + + return FALSE; +} + +static gboolean +print_preview_leave_notify_event (GtkWidget *widget, + GdkEventCrossing *event) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + + if (event->mode == GDK_CROSSING_NORMAL) + print_preview_set_inside (preview, FALSE); + + return FALSE; +} + +static gboolean +print_preview_expose_event (GtkWidget *widget, + GdkEventExpose *event) +{ + PrintPreview *preview = PRINT_PREVIEW (widget); + GtkStyle *style = gtk_widget_get_style (widget); + GtkAllocation allocation; + cairo_t *cr; + gdouble paper_width; + gdouble paper_height; + gdouble left_margin; + gdouble right_margin; + gdouble top_margin; + gdouble bottom_margin; + gdouble scale; + gint border; + + gtk_widget_get_allocation (widget, &allocation); + + border = gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1; + + print_preview_get_page_size (preview, &paper_width, &paper_height); + print_preview_get_page_margins (preview, + &left_margin, &right_margin, + &top_margin, &bottom_margin); + + scale = print_preview_get_scale (preview); + + cr = gdk_cairo_create (gtk_widget_get_window (widget)); + + cairo_translate (cr, + allocation.x + border, + allocation.y + border); + + if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL) + { + gint width = allocation.width - 2 * border; + + cairo_translate (cr, width - scale * paper_width, 0); + } + + cairo_set_line_width (cr, 1.0); + + /* draw page background */ + cairo_rectangle (cr, 0, 0, scale * paper_width, scale * paper_height); + + gdk_cairo_set_source_color (cr, &style->black); + cairo_stroke_preserve (cr); + + gdk_cairo_set_source_color (cr, &style->white); + cairo_fill (cr); + + /* draw page_margins */ + cairo_rectangle (cr, + scale * left_margin, + scale * top_margin, + scale * (paper_width - left_margin - right_margin), + scale * (paper_height - top_margin - bottom_margin)); + + gdk_cairo_set_source_color (cr, &style->mid[gtk_widget_get_state (widget)]); + cairo_stroke (cr); + + cairo_translate (cr, + scale * (left_margin + preview->image_offset_x), + scale * (top_margin + preview->image_offset_y)); + + if (preview->dragging || preview->inside) + { + cairo_rectangle (cr, + 0, 0, + scale * preview->image_width, + scale * preview->image_height); + + gdk_cairo_set_source_color (cr, &style->black); + cairo_stroke (cr); + } + + if (preview->thumbnail == NULL && + gimp_item_is_valid (preview->drawable_id)) + { + preview->thumbnail = + print_preview_get_thumbnail (preview->drawable_id, + MIN (allocation.width, 1024), + MIN (allocation.height, 1024)); + } + + if (preview->thumbnail != NULL) + { + gdouble scale_x; + gdouble scale_y; + + scale_x = (preview->image_width / + cairo_image_surface_get_width (preview->thumbnail)); + scale_y = (preview->image_height / + cairo_image_surface_get_height (preview->thumbnail)); + + cairo_rectangle (cr, 0, 0, preview->image_width, preview->image_height); + + cairo_scale (cr, scale_x * scale, scale_y * scale); + + cairo_set_source_surface (cr, preview->thumbnail, 0, 0); + cairo_fill (cr); + } + + cairo_destroy (cr); + + return FALSE; +} + +/** + * print_preview_new: + * @page: page setup + * @drawable_id: the drawable to print + * + * Creates a new #PrintPreview widget. + * + * Return value: the new #PrintPreview widget. + **/ +GtkWidget * +print_preview_new (GtkPageSetup *page, + gint32 drawable_id) +{ + PrintPreview *preview; + + g_return_val_if_fail (GTK_IS_PAGE_SETUP (page), NULL); + + preview = g_object_new (PRINT_TYPE_PREVIEW, NULL); + + preview->drawable_id = drawable_id; + + print_preview_set_page_setup (preview, page); + + return GTK_WIDGET (preview); +} + +/** + * print_preview_set_image_dpi: + * @preview: a #PrintPreview. + * @xres: the X resolution + * @yres: the Y resolution + * + * Sets the resolution of the image/drawable displayed by the + * #PrintPreview. + **/ +void +print_preview_set_image_dpi (PrintPreview *preview, + gdouble xres, + gdouble yres) +{ + gdouble width; + gdouble height; + + g_return_if_fail (PRINT_IS_PREVIEW (preview)); + g_return_if_fail (xres > 0.0 && yres > 0.0); + + width = gimp_drawable_width (preview->drawable_id) * 72.0 / xres; + height = gimp_drawable_height (preview->drawable_id) * 72.0 / yres; + + if (width != preview->image_width || height != preview->image_height) + { + preview->image_width = width; + preview->image_height = height; + + gtk_widget_queue_draw (GTK_WIDGET (preview)); + } +} + +/** + * print_preview_set_page_setup: + * @preview: a #PrintPreview. + * @page: the page setup to use + * + * Sets the page setup to use by the #PrintPreview. + **/ +void +print_preview_set_page_setup (PrintPreview *preview, + GtkPageSetup *page) +{ + g_return_if_fail (PRINT_IS_PREVIEW (preview)); + g_return_if_fail (GTK_IS_PAGE_SETUP (page)); + + if (preview->page) + g_object_unref (preview->page); + + preview->page = gtk_page_setup_copy (page); + + gtk_widget_queue_resize (GTK_WIDGET (preview)); +} + +/** + * print_preview_set_image_offsets: + * @preview: a #PrintPreview. + * @offset_x: the X offset + * @offset_y: the Y offset + * + * Sets the offsets of the image/drawable displayed by the #PrintPreview. + * It does not emit the "offsets-changed" signal. + **/ +void +print_preview_set_image_offsets (PrintPreview *preview, + gdouble offset_x, + gdouble offset_y) +{ + g_return_if_fail (PRINT_IS_PREVIEW (preview)); + + preview->image_offset_x = offset_x; + preview->image_offset_y = offset_y; + + gtk_widget_queue_draw (GTK_WIDGET (preview)); +} + +/** + * print_preview_set_image_offsets_max: + * @preview: a #PrintPreview. + * @offset_x_max: the maximum X offset allowed + * @offset_y_max: the maximum Y offset allowed + * + * Sets the maximum offsets of the image/drawable displayed by the + * #PrintPreview. It does not emit the "offsets-changed" signal. + **/ +void +print_preview_set_image_offsets_max (PrintPreview *preview, + gdouble offset_x_max, + gdouble offset_y_max) +{ + g_return_if_fail (PRINT_IS_PREVIEW (preview)); + + preview->image_offset_x_max = offset_x_max; + preview->image_offset_y_max = offset_y_max; + + gtk_widget_queue_draw (GTK_WIDGET (preview)); +} + +/** + * print_preview_set_use_full_page: + * @preview: a #PrintPreview. + * @full_page: TRUE to ignore the page margins + * + * If @full_page is TRUE, the page margins are ignored and the full page + * can be used to setup printing. + **/ +void +print_preview_set_use_full_page (PrintPreview *preview, + gboolean full_page) +{ + g_return_if_fail (PRINT_IS_PREVIEW (preview)); + + preview->use_full_page = full_page; + + gtk_widget_queue_draw (GTK_WIDGET (preview)); +} + +static gboolean +print_preview_is_inside (PrintPreview *preview, + gdouble x, + gdouble y) +{ + GtkWidget *widget = GTK_WIDGET (preview); + GtkAllocation allocation; + gdouble left_margin; + gdouble right_margin; + gdouble top_margin; + gdouble bottom_margin; + gdouble scale; + gint border; + + gtk_widget_get_allocation (widget, &allocation); + + border = gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1; + + x -= border; + + scale = print_preview_get_scale (preview); + + if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL) + { + gdouble paper_width; + gdouble paper_height; + gint width = allocation.width - 2 * border; + + print_preview_get_page_size (preview, &paper_width, &paper_height); + + x -= width - scale * paper_width; + } + + print_preview_get_page_margins (preview, + &left_margin, &right_margin, + &top_margin, &bottom_margin); + + x = x / scale - left_margin; + y = y / scale - top_margin; + + return (x > preview->image_offset_x && + x < preview->image_offset_x + preview->image_width && + y > preview->image_offset_y && + y < preview->image_offset_y + preview->image_height); +} + +static void +print_preview_set_inside (PrintPreview *preview, + gboolean inside) +{ + if (inside != preview->inside) + { + GtkWidget *widget = GTK_WIDGET (preview); + + preview->inside = inside; + + if (gtk_widget_is_drawable (widget)) + gdk_window_set_cursor (gtk_widget_get_window (widget), + inside ? preview->cursor : NULL); + + gtk_widget_queue_draw (widget); + } +} + +static gdouble +print_preview_get_scale (PrintPreview *preview) +{ + GtkWidget *widget = GTK_WIDGET (preview); + GtkAllocation allocation; + gdouble paper_width; + gdouble paper_height; + gdouble scale_x; + gdouble scale_y; + gint border; + + gtk_widget_get_allocation (widget, &allocation); + + border = gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1; + + print_preview_get_page_size (preview, &paper_width, &paper_height); + + scale_x = (gdouble) (allocation.width - 2 * border) / paper_width; + scale_y = (gdouble) (allocation.height - 2 * border) / paper_height; + + return MIN (scale_x, scale_y); +} + +static void +print_preview_get_page_size (PrintPreview *preview, + gdouble *paper_width, + gdouble *paper_height) +{ + *paper_width = gtk_page_setup_get_paper_width (preview->page, + GTK_UNIT_POINTS); + *paper_height = gtk_page_setup_get_paper_height (preview->page, + GTK_UNIT_POINTS); +} + +static void +print_preview_get_page_margins (PrintPreview *preview, + gdouble *left_margin, + gdouble *right_margin, + gdouble *top_margin, + gdouble *bottom_margin) +{ + if (preview->use_full_page) + { + *left_margin = 0.0; + *right_margin = 0.0; + *top_margin = 0.0; + *bottom_margin = 0.0; + } + else + { + *left_margin = gtk_page_setup_get_left_margin (preview->page, + GTK_UNIT_POINTS); + *right_margin = gtk_page_setup_get_right_margin (preview->page, + GTK_UNIT_POINTS); + *top_margin = gtk_page_setup_get_top_margin (preview->page, + GTK_UNIT_POINTS); + *bottom_margin = gtk_page_setup_get_bottom_margin (preview->page, + GTK_UNIT_POINTS); + } +} + + +/* This thumbnail code should eventually end up in libgimpui. */ + +static cairo_surface_t * +print_preview_get_thumbnail (gint32 drawable_id, + gint width, + gint height) +{ + cairo_surface_t *surface; + cairo_format_t format; + guchar *data; + guchar *dest; + const guchar *src; + gint src_stride; + gint dest_stride; + gint y; + gint bpp; + + g_return_val_if_fail (width > 0 && width <= 1024, NULL); + g_return_val_if_fail (height > 0 && height <= 1024, NULL); + + data = gimp_drawable_get_thumbnail_data (drawable_id, + &width, &height, &bpp); + + switch (bpp) + { + case 1: + case 3: + format = CAIRO_FORMAT_RGB24; + break; + + case 2: + case 4: + format = CAIRO_FORMAT_ARGB32; + break; + + default: + g_assert_not_reached (); + break; + } + + surface = cairo_image_surface_create (format, width, height); + + src = data; + src_stride = width * bpp; + + dest = cairo_image_surface_get_data (surface); + dest_stride = cairo_image_surface_get_stride (surface); + + for (y = 0; y < height; y++) + { + const guchar *s = src; + guchar *d = dest; + gint w = width; + + switch (bpp) + { + case 1: + while (w--) + { + GIMP_CAIRO_RGB24_SET_PIXEL (d, s[0], s[0], s[0]); + s += 1; + d += 4; + } + break; + + case 2: + while (w--) + { + GIMP_CAIRO_ARGB32_SET_PIXEL (d, s[0], s[0], s[0], s[1]); + s += 2; + d += 4; + } + break; + + case 3: + while (w--) + { + GIMP_CAIRO_RGB24_SET_PIXEL (d, s[0], s[1], s[2]); + s += 3; + d += 4; + } + break; + + case 4: + while (w--) + { + GIMP_CAIRO_ARGB32_SET_PIXEL (d, s[0], s[1], s[2], s[3]); + s += 4; + d += 4; + } + break; + } + + src += src_stride; + dest += dest_stride; + } + + g_free (data); + + cairo_surface_mark_dirty (surface); + + return surface; +} |