274 lines
7 KiB
C
274 lines
7 KiB
C
/* gui_image.c - GUI component to display an image. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/gui.h>
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#include <grub/gui_string_util.h>
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#include <grub/bitmap.h>
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#include <grub/bitmap_scale.h>
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struct grub_gui_image
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{
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struct grub_gui_component_ops *image;
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grub_gui_container_t parent;
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grub_video_rect_t bounds;
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char *id;
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int preferred_width;
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int preferred_height;
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struct grub_video_bitmap *raw_bitmap;
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struct grub_video_bitmap *bitmap;
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};
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typedef struct grub_gui_image *grub_gui_image_t;
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static void
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image_destroy (void *vself)
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{
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grub_gui_image_t self = vself;
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/* Free the scaled bitmap, unless it's a reference to the raw bitmap. */
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if (self->bitmap && (self->bitmap != self->raw_bitmap))
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grub_video_bitmap_destroy (self->bitmap);
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if (self->raw_bitmap)
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grub_video_bitmap_destroy (self->raw_bitmap);
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grub_free (self);
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}
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static const char *
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image_get_id (void *vself)
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{
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grub_gui_image_t self = vself;
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return self->id;
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}
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static int
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image_is_instance (void *vself __attribute__((unused)), const char *type)
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{
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return grub_strcmp (type, "component") == 0;
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}
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static void
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image_paint (void *vself, const grub_video_rect_t *region)
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{
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grub_gui_image_t self = vself;
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grub_video_rect_t vpsave;
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if (! self->bitmap)
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return;
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if (!grub_video_have_common_points (region, &self->bounds))
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return;
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grub_gui_set_viewport (&self->bounds, &vpsave);
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grub_video_blit_bitmap (self->bitmap, GRUB_VIDEO_BLIT_BLEND,
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0, 0, 0, 0,
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grub_video_bitmap_get_width (self->bitmap),
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grub_video_bitmap_get_height (self->bitmap));
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grub_gui_restore_viewport (&vpsave);
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}
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static void
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image_set_parent (void *vself, grub_gui_container_t parent)
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{
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grub_gui_image_t self = vself;
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self->parent = parent;
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}
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static grub_gui_container_t
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image_get_parent (void *vself)
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{
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grub_gui_image_t self = vself;
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return self->parent;
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}
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static grub_err_t
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rescale_image (grub_gui_image_t self)
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{
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if (! self->raw_bitmap)
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{
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if (self->bitmap)
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{
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grub_video_bitmap_destroy (self->bitmap);
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self->bitmap = 0;
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}
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return grub_errno;
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}
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unsigned width = self->bounds.width;
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unsigned height = self->bounds.height;
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if (self->bitmap
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&& (grub_video_bitmap_get_width (self->bitmap) == width)
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&& (grub_video_bitmap_get_height (self->bitmap) == height))
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{
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/* Nothing to do; already the right size. */
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return grub_errno;
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}
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/* Free any old scaled bitmap,
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*unless* it's a reference to the raw bitmap. */
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if (self->bitmap && (self->bitmap != self->raw_bitmap))
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grub_video_bitmap_destroy (self->bitmap);
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self->bitmap = 0;
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/* Create a scaled bitmap, unless the requested size is the same
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as the raw size -- in that case a reference is made. */
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if (grub_video_bitmap_get_width (self->raw_bitmap) == width
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&& grub_video_bitmap_get_height (self->raw_bitmap) == height)
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{
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self->bitmap = self->raw_bitmap;
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return grub_errno;
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}
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/* Don't scale to an invalid size. */
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if (width == 0 || height == 0)
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return grub_errno;
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/* Create the scaled bitmap. */
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grub_video_bitmap_create_scaled (&self->bitmap,
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width,
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height,
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self->raw_bitmap,
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GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_error_push ();
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grub_error (grub_errno, "failed to scale bitmap for image component");
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}
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return grub_errno;
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}
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static void
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image_set_bounds (void *vself, const grub_video_rect_t *bounds)
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{
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grub_gui_image_t self = vself;
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self->bounds = *bounds;
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rescale_image (self);
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}
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static void
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image_get_bounds (void *vself, grub_video_rect_t *bounds)
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{
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grub_gui_image_t self = vself;
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*bounds = self->bounds;
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}
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static void
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image_get_preferred_size (void *vself, int *width, int *height)
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{
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grub_gui_image_t self = vself;
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if (self->raw_bitmap)
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{
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*width = grub_video_bitmap_get_width (self->raw_bitmap);
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*height = grub_video_bitmap_get_height (self->raw_bitmap);
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}
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else
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{
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*width = 0;
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*height = 0;
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}
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/* Allow preferred dimensions to override the image dimensions. */
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if (self->preferred_width >= 0)
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*width = self->preferred_width;
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if (self->preferred_height >= 0)
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*height = self->preferred_height;
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}
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static grub_err_t
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load_image (grub_gui_image_t self, const char *path)
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{
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struct grub_video_bitmap *bitmap;
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if (grub_video_bitmap_load (&bitmap, path) != GRUB_ERR_NONE)
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return grub_errno;
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if (self->bitmap && (self->bitmap != self->raw_bitmap))
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grub_video_bitmap_destroy (self->bitmap);
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if (self->raw_bitmap)
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grub_video_bitmap_destroy (self->raw_bitmap);
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self->raw_bitmap = bitmap;
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return rescale_image (self);
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}
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static grub_err_t
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image_set_property (void *vself, const char *name, const char *value)
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{
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grub_gui_image_t self = vself;
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if (grub_strcmp (name, "file") == 0)
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return load_image (self, value);
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else if (grub_strcmp (name, "preferred_size") == 0)
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{
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int w;
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int h;
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if (grub_gui_parse_2_tuple (value, &w, &h) != GRUB_ERR_NONE)
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return grub_errno;
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self->preferred_width = w;
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self->preferred_height = h;
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}
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else if (grub_strcmp (name, "id") == 0)
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{
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grub_free (self->id);
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if (value)
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self->id = grub_strdup (value);
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else
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self->id = 0;
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}
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return grub_errno;
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}
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static struct grub_gui_component_ops image_ops =
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{
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.destroy = image_destroy,
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.get_id = image_get_id,
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.is_instance = image_is_instance,
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.paint = image_paint,
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.set_parent = image_set_parent,
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.get_parent = image_get_parent,
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.set_bounds = image_set_bounds,
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.get_bounds = image_get_bounds,
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.get_preferred_size = image_get_preferred_size,
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.set_property = image_set_property
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};
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grub_gui_component_t
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grub_gui_image_new (void)
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{
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grub_gui_image_t image;
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image = grub_malloc (sizeof (*image));
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if (! image)
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return 0;
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image->image = &image_ops;
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image->parent = 0;
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image->bounds.x = 0;
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image->bounds.y = 0;
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image->bounds.width = 0;
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image->bounds.height = 0;
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image->id = 0;
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image->preferred_width = -1;
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image->preferred_height = -1;
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image->raw_bitmap = 0;
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image->bitmap = 0;
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return (grub_gui_component_t) image;
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}
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