From 30dc399b724629053cee044a45d8f55b0ae9c7a2 Mon Sep 17 00:00:00 2001 From: Alexander Larsson Date: Thu, 2 May 2013 16:23:42 +0200 Subject: [PATCH] Add GtkPixelCache GtkPixelCache is a helper utility that lets you implement faster scrolling of a viewport of a canvas by using an offscreen pixmap cache. You call _gtk_pixel_cache_draw with a callback function that does the drawing, and additionally you specify the size and the position of the viewport in the widget, and the position and size of the canvas wrt the viewport. The callback will be called to draw on an offscreen surface, and the surface will be drawn on the window. The next time you do the same, any already drawn pieces of the surface are re-used from the offscreen and need not be rendered again. If things inside the canvas change you need to call _gtk_pixel_cache_invalidate to tell the cache about this. Some other details: * The offscreen surface is generally a bit larger than the viewport, so scrolling a small amount can often be done without redrawing children. * If the canvas is not larger than the viewport no offscreen surface is used. GtkPixelCache: Make sure we always copy using SOURCE We were using OVER for the first copy (from source to group surface. GtkPixelCache: Fix x/y typos GtkPixelCache: Allow NULL for invalidate region gtkpixelcache: Use CONTENT_COLOR for solid bg windows --- gtk/Makefile.am | 2 + gtk/gtkpixelcache.c | 341 +++++++++++++++++++++++++++++++++++++ gtk/gtkpixelcacheprivate.h | 48 ++++++ 3 files changed, 391 insertions(+) create mode 100644 gtk/gtkpixelcache.c create mode 100644 gtk/gtkpixelcacheprivate.h diff --git a/gtk/Makefile.am b/gtk/Makefile.am index ad3f711020..87c920f981 100644 --- a/gtk/Makefile.am +++ b/gtk/Makefile.am @@ -515,6 +515,7 @@ gtk_private_h_sources = \ gtkprintoperation-private.h \ gtkprintutils.h \ gtkprivate.h \ + gtkpixelcacheprivate.h \ gtkquery.h \ gtkrbtree.h \ gtkrecentchooserdefault.h \ @@ -796,6 +797,7 @@ gtk_base_c_sources = \ gtkprivate.c \ gtkprivatetypebuiltins.c \ gtkprogressbar.c \ + gtkpixelcache.c \ gtkradioaction.c \ gtkradiobutton.c \ gtkradiomenuitem.c \ diff --git a/gtk/gtkpixelcache.c b/gtk/gtkpixelcache.c new file mode 100644 index 0000000000..1a8630819c --- /dev/null +++ b/gtk/gtkpixelcache.c @@ -0,0 +1,341 @@ +/* GTK - The GIMP Toolkit + * Copyright (C) 2013 Red Hat, Inc. + * + * 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 2 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 . + */ + +#include "config.h" + +#include "gtkpixelcacheprivate.h" + +/* The extra size of the offscreen surface we allocate + to make scrolling more efficient */ +#define EXTRA_SIZE 64 + +/* When resizing viewport to smaller we allow this extra + size to avoid constantly reallocating when resizing */ +#define ALLOW_LARGER_SIZE 32 + +struct _GtkPixelCache { + cairo_surface_t *surface; + + /* Valid if surface != NULL */ + int surface_x; + int surface_y; + int surface_w; + int surface_h; + + /* may be null if not dirty */ + cairo_region_t *surface_dirty; +}; + +GtkPixelCache * +_gtk_pixel_cache_new () +{ + GtkPixelCache *cache; + + cache = g_new0 (GtkPixelCache, 1); + + return cache; +} + +void +_gtk_pixel_cache_free (GtkPixelCache *cache) +{ + if (cache == NULL) + return; + + if (cache->surface != NULL) + cairo_surface_destroy (cache->surface); + + if (cache->surface_dirty != NULL) + cairo_region_destroy (cache->surface_dirty); + + g_free (cache); +} + +/* Region is in canvas coordinates */ +void +_gtk_pixel_cache_invalidate (GtkPixelCache *cache, + cairo_region_t *region) +{ + cairo_rectangle_int_t r; + cairo_region_t *free_region = NULL; + + if (cache->surface == NULL || + (region != NULL && cairo_region_is_empty (region))) + return; + + if (region == NULL) + { + r.x = cache->surface_x; + r.y = cache->surface_y; + r.width = cache->surface_w; + r.height = cache->surface_h; + + free_region = region = + cairo_region_create_rectangle (&r); + } + + if (cache->surface_dirty == NULL) + { + cache->surface_dirty = cairo_region_copy (region); + cairo_region_translate (cache->surface_dirty, + -cache->surface_x, + -cache->surface_y); + } + else + { + cairo_region_translate (region, + -cache->surface_x, + -cache->surface_y); + cairo_region_union (cache->surface_dirty, region); + cairo_region_translate (region, + cache->surface_x, + cache->surface_y); + } + + if (free_region) + cairo_region_destroy (free_region); + + r.x = 0; + r.y = 0; + r.width = cache->surface_w; + r.height = cache->surface_h; + + cairo_region_intersect_rectangle (cache->surface_dirty, &r); +} + +static void +_gtk_pixel_cache_create_surface_if_needed (GtkPixelCache *cache, + GdkWindow *window, + cairo_rectangle_int_t *view_rect, + cairo_rectangle_int_t *canvas_rect) +{ + cairo_rectangle_int_t rect; + int surface_w, surface_h; + cairo_content_t content; + cairo_pattern_t *bg; + double red, green, blue, alpha; + + content = CAIRO_CONTENT_COLOR_ALPHA; + bg = gdk_window_get_background_pattern (window); + if (bg != NULL && + cairo_pattern_get_type (bg) == CAIRO_PATTERN_TYPE_SOLID && + cairo_pattern_get_rgba (bg, &red, &green, &blue, &alpha) == CAIRO_STATUS_SUCCESS && + alpha == 1.0) + content = CAIRO_CONTENT_COLOR; + + surface_w = view_rect->width; + if (canvas_rect->width > surface_w) + surface_w = MIN (surface_w + EXTRA_SIZE, canvas_rect->width); + + surface_h = view_rect->height; + if (canvas_rect->height > surface_h) + surface_h = MIN (surface_h + EXTRA_SIZE, canvas_rect->height); + + /* If current surface can't fit view_rect or is too large, kill it */ + if (cache->surface != NULL && + (cairo_surface_get_content (cache->surface) != content || + cache->surface_w < view_rect->width || + cache->surface_w > surface_w + ALLOW_LARGER_SIZE || + cache->surface_h < view_rect->height || + cache->surface_h > surface_h + ALLOW_LARGER_SIZE)) + { + cairo_surface_destroy (cache->surface); + cache->surface = NULL; + if (cache->surface_dirty) + cairo_region_destroy (cache->surface_dirty); + cache->surface_dirty = NULL; + } + + /* Don't allocate a surface if view >= canvas, as we won't + be scrolling then anyway */ + if (cache->surface == NULL && + (view_rect->width < canvas_rect->width || + view_rect->height < canvas_rect->height)) + { + cache->surface_x = -canvas_rect->x; + cache->surface_y = -canvas_rect->y; + cache->surface_w = surface_w; + cache->surface_h = surface_h; + + cache->surface = + gdk_window_create_similar_surface (window, content, + surface_w, surface_h); + rect.x = 0; + rect.y = 0; + rect.width = surface_w; + rect.height = surface_h; + cache->surface_dirty = + cairo_region_create_rectangle (&rect); + } +} + +void +_gtk_pixel_cache_set_position (GtkPixelCache *cache, + cairo_rectangle_int_t *view_rect, + cairo_rectangle_int_t *canvas_rect) +{ + cairo_rectangle_int_t r, view_pos; + cairo_region_t *copy_region; + int new_surf_x, new_surf_y; + cairo_t *backing_cr; + + if (cache->surface == NULL) + return; + + /* Position of view inside canvas */ + view_pos.x = -canvas_rect->x; + view_pos.y = -canvas_rect->y; + view_pos.width = view_rect->width; + view_pos.height = view_rect->height; + + /* Reposition so all is visible */ + if (view_pos.x < cache->surface_x || + view_pos.x + view_pos.width > + cache->surface_x + cache->surface_w || + view_pos.y < cache->surface_y || + view_pos.y + view_pos.height > + cache->surface_y + cache->surface_h) + { + new_surf_x = cache->surface_x; + if (view_pos.x < cache->surface_x) + new_surf_x = MAX (view_pos.x + view_pos.width - cache->surface_w, 0); + else if (view_pos.x + view_pos.width > + cache->surface_x + cache->surface_w) + new_surf_x = MIN (view_pos.x, canvas_rect->width - cache->surface_w); + + new_surf_y = cache->surface_y; + if (view_pos.y < cache->surface_y) + new_surf_y = MAX (view_pos.y + view_pos.height - cache->surface_h, 0); + else if (view_pos.y + view_pos.height > + cache->surface_y + cache->surface_h) + new_surf_y = MIN (view_pos.y, canvas_rect->height - cache->surface_h); + + r.x = 0; + r.y = 0; + r.width = cache->surface_w; + r.height = cache->surface_h; + copy_region = cairo_region_create_rectangle (&r); + + if (cache->surface_dirty) + { + cairo_region_subtract (copy_region, cache->surface_dirty); + cairo_region_destroy (cache->surface_dirty); + cache->surface_dirty = NULL; + } + + cairo_region_translate (copy_region, + cache->surface_x - new_surf_x, + cache->surface_y - new_surf_y); + cairo_region_intersect_rectangle (copy_region, &r); + + backing_cr = cairo_create (cache->surface); + gdk_cairo_region (backing_cr, copy_region); + cairo_set_operator (backing_cr, CAIRO_OPERATOR_SOURCE); + cairo_clip (backing_cr); + cairo_push_group (backing_cr); + cairo_set_source_surface (backing_cr, cache->surface, + cache->surface_x - new_surf_x, + cache->surface_y - new_surf_y); + cairo_paint (backing_cr); + cairo_pop_group_to_source (backing_cr); + cairo_paint (backing_cr); + cairo_destroy (backing_cr); + + cache->surface_x = new_surf_x; + cache->surface_y = new_surf_y; + + cairo_region_xor_rectangle (copy_region, &r); + cache->surface_dirty = copy_region; + } +} + +void +_gtk_pixel_cache_repaint (GtkPixelCache *cache, + GtkPixelCacheDrawFunc draw, + cairo_rectangle_int_t *view_rect, + cairo_rectangle_int_t *canvas_rect, + gpointer user_data) +{ + cairo_t *backing_cr; + + if (cache->surface && + cache->surface_dirty && + !cairo_region_is_empty (cache->surface_dirty)) + { + backing_cr = cairo_create (cache->surface); + gdk_cairo_region (backing_cr, cache->surface_dirty); + cairo_clip (backing_cr); + cairo_translate (backing_cr, + -cache->surface_x - canvas_rect->x - view_rect->x, + -cache->surface_y - canvas_rect->y - view_rect->y); + cairo_set_source_rgba (backing_cr, + 0.0, 0, 0, 0.0); + cairo_set_operator (backing_cr, CAIRO_OPERATOR_SOURCE); + cairo_paint (backing_cr); + + cairo_set_operator (backing_cr, CAIRO_OPERATOR_OVER); + + draw (backing_cr, user_data); + + cairo_destroy (backing_cr); + } + + if (cache->surface_dirty) + { + cairo_region_destroy (cache->surface_dirty); + cache->surface_dirty = NULL; + } +} + +void +_gtk_pixel_cache_draw (GtkPixelCache *cache, + cairo_t *cr, + GdkWindow *window, + /* View position in widget coords */ + cairo_rectangle_int_t *view_rect, + /* Size and position of canvas in view coords */ + cairo_rectangle_int_t *canvas_rect, + GtkPixelCacheDrawFunc draw, + gpointer user_data) +{ + _gtk_pixel_cache_create_surface_if_needed (cache, window, + view_rect, canvas_rect); + _gtk_pixel_cache_set_position (cache, view_rect, canvas_rect); + _gtk_pixel_cache_repaint (cache, draw, view_rect, canvas_rect, user_data); + + if (cache->surface && + /* Don't use backing surface if rendering elsewhere */ + cairo_surface_get_type (cache->surface) == cairo_surface_get_type (cairo_get_target (cr))) + { + cairo_save (cr); + cairo_set_source_surface (cr, cache->surface, + cache->surface_x + view_rect->x + canvas_rect->x, + cache->surface_y + view_rect->y + canvas_rect->y); + cairo_rectangle (cr, view_rect->x, view_rect->y, + view_rect->width, view_rect->height); + cairo_fill (cr); + cairo_restore (cr); + } + else + { + cairo_rectangle (cr, + view_rect->x, view_rect->y, + view_rect->width, view_rect->height); + cairo_clip (cr); + draw (cr, user_data); + } +} diff --git a/gtk/gtkpixelcacheprivate.h b/gtk/gtkpixelcacheprivate.h new file mode 100644 index 0000000000..2b916d0b9c --- /dev/null +++ b/gtk/gtkpixelcacheprivate.h @@ -0,0 +1,48 @@ +/* + * Copyright © 2013 Red Hat Inc. + * + * 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 2.1 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 . + * + * Authors: Alexander Larsson + */ + +#ifndef __GTK_PIXEL_CACHE_PRIVATE_H__ +#define __GTK_PIXEL_CACHE_PRIVATE_H__ + +#include +#include + +G_BEGIN_DECLS + +typedef struct _GtkPixelCache GtkPixelCache; + +typedef void (*GtkPixelCacheDrawFunc) (cairo_t *cr, + gpointer user_data); + +GtkPixelCache *_gtk_pixel_cache_new (void); +void _gtk_pixel_cache_free (GtkPixelCache *cache); +void _gtk_pixel_cache_invalidate (GtkPixelCache *cache, + cairo_region_t *region); +void _gtk_pixel_cache_draw (GtkPixelCache *cache, + cairo_t *cr, + GdkWindow *window, + cairo_rectangle_int_t *view_rect, + cairo_rectangle_int_t *canvas_rect, + GtkPixelCacheDrawFunc draw, + gpointer user_data); + + +G_END_DECLS + +#endif /* __GTK_PIXEL_CACHE_PRIVATE_H__ */