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Diffstat (limited to 'eazel-engine/src/eazel-theme-pixmaps.c')
| -rw-r--r-- | eazel-engine/src/eazel-theme-pixmaps.c | 630 |
1 files changed, 630 insertions, 0 deletions
diff --git a/eazel-engine/src/eazel-theme-pixmaps.c b/eazel-engine/src/eazel-theme-pixmaps.c new file mode 100644 index 0000000..933b57a --- /dev/null +++ b/eazel-engine/src/eazel-theme-pixmaps.c @@ -0,0 +1,630 @@ +/* eazel-theme-pixmaps.c -- image manipulation and caching + + Copyright (C) 2000 Eazel, Inc. + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: eazel-theme-pixmaps.c,v 1.5 2001/01/27 01:19:39 jsh Exp $ + + Authors: John Harper <jsh@eazel.com> */ + +/* AIX requires this to be the first thing in the file. */ +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#ifndef __GNUC__ +# if HAVE_ALLOCA_H +# include <alloca.h> +# else +# ifdef _AIX + #pragma alloca +# else +# ifndef alloca /* predefined by HP cc +Olibcalls */ + char *alloca (); +# endif +# endif +# endif +#endif + +#include "eazel-theme.h" +#include <gdk-pixbuf/gdk-pixbuf.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + + +/* pixmap caching, borrowed from sawfish */ + +static gulong cached_pixels, max_cached_pixels = 64 * 1024; +static gulong hits, misses; + +typedef struct pixmap_cache_node_struct pixmap_cache_node; + +struct pixmap_cache_node_struct { + pixmap_cache_node *next, *pred; + pixmap_cache_node *newer, *older; + eazel_engine_image *im; + int width, height; + GdkPixmap *p1; + GdkBitmap *p2; + int ref_count; +}; + +static pixmap_cache_node *oldest, *newest; + +/* list manipulators */ + +static void +remove_from_age_list (pixmap_cache_node *n) +{ + if (n->newer != 0) + n->newer->older = n->older; + else + newest = n->older; + if (n->older != 0) + n->older->newer = n->newer; + else + oldest = n->newer; +} + +static void +prepend_to_age_list (pixmap_cache_node *n) +{ + n->newer = oldest; + if (n->newer != 0) + n->newer->older = n; + oldest = n; + n->older = 0; + if (newest == 0) + newest = n; +} + +static void +remove_from_image (pixmap_cache_node *n) +{ + if (n->next != 0) + n->next->pred = n->pred; + else + n->im->pixmap_last = n->pred; + if (n->pred != 0) + n->pred->next = n->next; + else + n->im->pixmap_first = n->next; +} + +static void +prepend_to_image (pixmap_cache_node *n) +{ + eazel_engine_image *im = n->im; + n->next = im->pixmap_first; + if (n->next != 0) + n->next->pred = n; + im->pixmap_first = n; + n->pred = 0; + if (im->pixmap_last == 0) + im->pixmap_last = n; +} + +static void +free_node (pixmap_cache_node *n, gboolean dealloc) +{ + if (n->p1 != 0) + gdk_pixmap_unref (n->p1); + if (n->p2 != 0) + gdk_bitmap_unref (n->p2); + if (dealloc) + g_free (n); +} + +static void +delete_node (pixmap_cache_node *n, gboolean dealloc) +{ + remove_from_image (n); + remove_from_age_list (n); + cached_pixels -= n->width * n->height; + free_node (n, dealloc); +} + +/* public interface */ + +static gboolean +pixmap_cache_ref (eazel_engine_image *im, int width, int height, + GdkPixmap **p1, GdkBitmap **p2) +{ + pixmap_cache_node *n; + for (n = im->pixmap_first; n != 0; n = n->next) + { + if (n->width == width && n->height == height) + { + remove_from_image (n); + prepend_to_image (n); + remove_from_age_list (n); + prepend_to_age_list (n); + n->ref_count++; + *p1 = n->p1; + *p2 = n->p2; + hits++; + return TRUE; + } + } + misses++; + return FALSE; +} + +static void +pixmap_cache_unref (eazel_engine_image *im, GdkPixmap *p1, GdkBitmap *p2) +{ + pixmap_cache_node *n; + for (n = im->pixmap_first; n != 0; n = n->next) + { + if (n->p1 == p1 && n->p2 == p2) + { + n->ref_count--; +#ifdef DISABLE_CACHE + if (n->ref_count == 0) + delete_node (n, TRUE); +#endif + return; + } + } + fprintf (stderr, "warning: unref'ing unknown image in pixmap-cache\n"); +} + +static void +pixmap_cache_set (eazel_engine_image *im, int width, int height, + GdkPixmap *p1, GdkBitmap *p2) +{ + int pixel_count = width * height; + pixmap_cache_node *n = 0; + + while (pixel_count + cached_pixels > max_cached_pixels) + { + /* remove oldest node */ + pixmap_cache_node *this = oldest; + while (this != 0 && this->ref_count > 0) + this = this->newer; + if (this == 0) + break; + delete_node (this, n != 0); + if (n == 0) + n = this; + } + + if (n == 0) + n = g_new0 (pixmap_cache_node, 1); + + n->im = im; + n->width = width; + n->height = height; + n->p1 = p1; + n->p2 = p2; + n->ref_count = 1; + + prepend_to_image (n); + prepend_to_age_list (n); + cached_pixels += pixel_count; +} + +static void +pixmap_cache_flush_image (eazel_engine_image *im) +{ + pixmap_cache_node *n, *next; + for (n = im->pixmap_first; n != 0; n = next) + { + next = n->next; + remove_from_age_list (n); + free_node (n, TRUE); + } + im->pixmap_first = im->pixmap_last = 0; +} + + +/* image filtering */ + +typedef struct { + guchar red, green, blue; + guchar alpha; +} pixbuf_pixel; + +/* Returns either a new pixbuf, or PIXBUF with its ref-count incremented */ +static GdkPixbuf * +map_pixbuf (GdkPixbuf *pixbuf, void (*fun)(pixbuf_pixel *, void *), void *data) +{ + int width, height, row_stride; + guchar *pixels; + int x, y; + + if (gdk_pixbuf_get_n_channels (pixbuf) == 3) + pixbuf = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0); + else + gdk_pixbuf_ref (pixbuf); + + width = gdk_pixbuf_get_width (pixbuf); + height = gdk_pixbuf_get_height (pixbuf); + row_stride = gdk_pixbuf_get_rowstride (pixbuf); + pixels = gdk_pixbuf_get_pixels (pixbuf); + + g_assert (gdk_pixbuf_get_n_channels (pixbuf) == 4); + + for (y = 0; y < height; y++) + { + guchar *row_pixels = pixels + y * row_stride; + + for (x = 0; x < width; x++) + { + pixbuf_pixel pixel; + + pixel.red = row_pixels[0]; + pixel.green = row_pixels[1]; + pixel.blue = row_pixels[2]; + pixel.alpha = row_pixels[3]; + + fun (&pixel, data); + + row_pixels[0] = pixel.red; + row_pixels[1] = pixel.green; + row_pixels[2] = pixel.blue; + row_pixels[3] = pixel.alpha; + + row_pixels += 4; + } + } + + return pixbuf; +} + +struct recolor_closure { + guchar rgb_buf[256*3]; +}; + +static void +recolor_callback (pixbuf_pixel *pixel, void *data) +{ + struct recolor_closure *rc = data; + int base; + + /* The trick is this: + + Recolorable pixels must have zero red and blue channels. The + green channel gives a notional grey-scale value that is multiplied + by the values in the closure */ + + if (pixel->red != 0 || pixel->blue != 0) + return; + + base = pixel->green * 3; + + pixel->red = rc->rgb_buf[base+0]; + pixel->green = rc->rgb_buf[base+1]; + pixel->blue = rc->rgb_buf[base+2]; +} + +static GdkPixbuf * +recolor_pixbuf (GdkPixbuf *pixbuf, eazel_engine_gradient *gradient) +{ + struct recolor_closure rc; + + eazel_engine_fill_gradient_rgb_buffer (gradient, 256, rc.rgb_buf, 0, 256); + + return map_pixbuf (pixbuf, recolor_callback, &rc); +} + + +/* image loading */ + +/* XXX move to gtkrc */ +static char *image_path[] = { + DATADIR, + 0 +}; + +static GdkPixbuf * +load_image (const char *file) +{ + char **path = image_path; + while (*path != 0) + { + GdkPixbuf *pixbuf; + size_t len = strlen (*path) + strlen (file) + 2; + char *buf = alloca (len); + sprintf (buf, "%s/%s", *path, file); + pixbuf = gdk_pixbuf_new_from_file (buf); + if (pixbuf != 0) + return pixbuf; + path++; + } + /* XXX error handling here */ + g_error ("No such image: %s", file); + return 0; +} + +static GdkPixbuf * +eazel_engine_image_get_pixbuf (eazel_engine_image *p) +{ + if (p->pixbuf == 0) + { + g_assert (p->filename != 0); + p->pixbuf = load_image (p->filename); + + if (p->pixbuf == 0) + return 0; + + if (p->recolor != 0) + { + GdkPixbuf *new; + new = recolor_pixbuf (p->pixbuf, p->recolor); + if (new != NULL) + { + gdk_pixbuf_unref (p->pixbuf); + p->pixbuf = new; + } + } + + } + return p->pixbuf; +} + + +/* image rendering */ + +static void +do_scale (GdkPixbuf *src, int src_x, int src_y, int src_w, int src_h, + GdkPixbuf *dst, int dst_x, int dst_y, int dst_w, int dst_h) +{ + double scale_x, scale_y; + double off_x, off_y; + + if (src_w <= 0 || src_h <= 0 || dst_w <= 0 || dst_h <= 0) + return; + + scale_x = dst_w / (double) src_w; + scale_y = dst_h / (double) src_h; + + off_x = dst_x - scale_x * src_x; + off_y = dst_y - scale_y * src_y; + + gdk_pixbuf_scale (src, dst, + dst_x, dst_y, + dst_w, dst_h, + off_x, off_y, + scale_x, scale_y, + GDK_INTERP_NEAREST); +} + +static void +eazel_engine_image_render (eazel_engine_image *image, int width, int height, + GdkPixmap **pixmap, GdkBitmap **mask) +{ + GdkPixbuf *im = eazel_engine_image_get_pixbuf (image); + GdkPixbuf *scaled = im; + gboolean need_to_unref = FALSE; + int im_width = gdk_pixbuf_get_width (im); + int im_height = gdk_pixbuf_get_height (im); + + g_assert (im != 0); + g_return_if_fail (width > 0); + g_return_if_fail (height > 0); + + if (pixmap_cache_ref (image, width, height, pixmap, mask)) + return; + + /* XXX handle cases where combined image borders are larger + XXX than the destination image.. */ + + if (im_width != width || im_height != height) + { + /* need to scale to width by height */ + + int border[4]; + border[0] = image->border[0]; + border[1] = image->border[1]; + border[2] = image->border[2]; + border[3] = image->border[3]; + + /* truncate borders if dest image is too small */ + if (border[0] + border[1] > width) + { + border[0] = MIN (border[0], width / 2); + border[1] = MIN (border[1], width / 2); + } + if (border[2] + border[3] > height + || image->border[2] + image->border[3] >= im_height) + { + border[2] = MIN (border[2], height / 2); + border[3] = MIN (border[3], height / 2); + } + + g_assert (border[0] + border[1] <= width); + g_assert (border[2] + border[3] <= height); + + /* create a new buffer */ + scaled = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (im), + gdk_pixbuf_get_has_alpha (im), + gdk_pixbuf_get_bits_per_sample (im), + width, height); + need_to_unref = TRUE; + + /* stretch borders to fit scaled image */ + + if (border[0] > 0) + { + do_scale (im, 0, image->border[2], image->border[0], + im_height - (image->border[2] + image->border[3]), + scaled, 0, border[2], border[0], + height - (border[2] + border[3])); + } + if (border[1] > 0) + { + do_scale (im, im_width - image->border[1], image->border[2], + image->border[1], + im_height - (image->border[2] + image->border[3]), + scaled, width - border[1], border[2], border[1], + height - (border[2] + border[3])); + } + + if (border[2] > 0) + { + do_scale (im, image->border[0], 0, + im_width - (image->border[0] + image->border[1]), + image->border[2], + scaled, border[0], 0, + width - (border[0] + border[1]), border[2]); + } + if (border[3] > 0) + { + do_scale (im, image->border[0], im_height - image->border[3], + im_width - (image->border[0] + image->border[1]), + image->border[3], + scaled, border[0], height - border[3], + width - (border[0] + border[1]), border[3]); + } + + /* now do corner intersections between borders */ + + if (border[0] > 0 && border[2] > 0) + { + do_scale (im, 0, 0, image->border[0], image->border[2], + scaled, 0, 0, border[0], border[2]); + } + if (border[1] > 0 && border[2] > 0) + { + do_scale (im, im_width - image->border[1], 0, + image->border[1], image->border[2], + scaled, width - border[1], 0, border[1], border[2]); + } + if (border[0] > 0 && border[3] > 0) + { + do_scale (im, 0, im_height - image->border[3], + image->border[0], image->border[3], + scaled, 0, height - border[3], border[0], border[3]); + } + if (border[1] > 0 && border[3] > 0) + { + do_scale (im, im_width - image->border[1], + im_height - image->border[3], + image->border[1], image->border[3], + scaled, width - border[1], height - border[3], + border[1], border[3]); + } + + /* scale the inner parts of the image */ + if (border[0] + border[1] < width + || border[2] + border[3] < height) + { + do_scale (im, image->border[0], image->border[2], + im_width - (image->border[0] + image->border[1]), + im_height - (image->border[2] + image->border[3]), + scaled, border[0], border[2], + width - (border[0] + border[1]), + height - (border[2] + border[3])); + } + } + + gdk_pixbuf_render_pixmap_and_mask (scaled, pixmap, mask, 128); + if (need_to_unref) + gdk_pixbuf_unref (scaled); + + pixmap_cache_set (image, width, height, *pixmap, *mask); +} + +static void +eazel_engine_image_free_pixmaps (eazel_engine_image *image, + GdkPixmap *pixmap, GdkBitmap *mask) +{ + pixmap_cache_unref (image, pixmap, mask); +} + + +/* stock images */ + +void +eazel_engine_stock_table_unref (eazel_engine_stock_table *table) +{ + table->ref_count--; + + if (table->ref_count == 0) + { + int i; + for (i = 0; i < EAZEL_ENGINE_STOCK_MAX; i++) + { + if (table->images[i].pixbuf != 0) + gdk_pixbuf_unref (table->images[i].pixbuf); + pixmap_cache_flush_image (&table->images[i]); + } + g_free (table); + } +} + +eazel_engine_stock_table * +eazel_engine_stock_table_ref (eazel_engine_stock_table *table) +{ + table->ref_count++; + return table; +} + +static inline eazel_engine_image * +get_stock_image (eazel_engine_stock_table *table, + eazel_engine_stock_image type) +{ + g_assert (type >= 0 && type < EAZEL_ENGINE_STOCK_MAX); + + return &table->images[type]; +} + +void +eazel_engine_stock_pixmap_and_mask_scaled (eazel_engine_stock_table *table, + eazel_engine_stock_image type, + int width, int height, + GdkPixmap **image, GdkBitmap **mask) +{ + eazel_engine_image *img = get_stock_image (table, type); + eazel_engine_image_render (img, width, height, image, mask); +} + +void +eazel_engine_stock_pixmap_and_mask (eazel_engine_stock_table *table, + eazel_engine_stock_image type, + GdkPixmap **image, GdkBitmap **mask) +{ + eazel_engine_image *img = get_stock_image (table, type); + GdkPixbuf *pixbuf = eazel_engine_image_get_pixbuf (img); + + eazel_engine_image_render (img, gdk_pixbuf_get_width (pixbuf), + gdk_pixbuf_get_height (pixbuf), + image, mask); +} + +void +eazel_engine_stock_free_pixmaps (eazel_engine_stock_table *table, + eazel_engine_stock_image type, + GdkPixmap *image, GdkPixmap *mask) +{ + eazel_engine_image *img = get_stock_image (table, type); + eazel_engine_image_free_pixmaps (img, image, mask); +} + +void +eazel_engine_stock_get_size (eazel_engine_stock_table *table, + eazel_engine_stock_image type, + int *width, int *height) +{ + eazel_engine_image *img = get_stock_image (table, type); + GdkPixbuf *pixbuf = eazel_engine_image_get_pixbuf (img); + + if (width != 0) + *width = gdk_pixbuf_get_width (pixbuf); + if (height != 0) + *height = gdk_pixbuf_get_height (pixbuf); +} |