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implement all kinds of crazy compositing-one-texture-onto-another BS.

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2002-01-27  Havoc Pennington  <hp@pobox.com>

	* src/theme.h, src/theme.c: implement all kinds of crazy
	compositing-one-texture-onto-another BS.
This commit is contained in:
Havoc Pennington 2002-01-27 07:32:46 +00:00 committed by Havoc Pennington
parent 7eac9e4958
commit 5b4e9c01cc
3 changed files with 585 additions and 51 deletions
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5
ChangeLog
View File

@ -1,3 +1,8 @@
2002-01-27 Havoc Pennington <hp@pobox.com>
* src/theme.h, src/theme.c: implement all kinds of crazy
compositing-one-texture-onto-another BS.
2002-01-27 Havoc Pennington <hp@pobox.com>
* src/display.c (event_callback): make the check for whether to

608
src/theme.c
View File

@ -25,6 +25,32 @@
#include <gtk/gtkwidget.h>
#include <string.h>
#define GDK_COLOR_RGBA(color) \
(0xff | \
(((color).red / 256) << 24) | \
(((color).green / 256) << 16) | \
(((color).blue / 256) << 8))
#define GDK_COLOR_RGB(color) \
((((color).red / 256) << 16) | \
(((color).green / 256) << 8) | \
(((color).blue / 256)))
static void
color_composite (const GdkColor *bg,
const GdkColor *fg,
double alpha_d,
GdkColor *color)
{
guint16 alpha;
*color = *bg;
alpha = alpha_d * 0xffff;
color->red = color->red + (((fg->red - color->red) * alpha + 0x8000) >> 16);
color->green = color->green + (((fg->green - color->green) * alpha + 0x8000) >> 16);
color->blue = color->blue + (((fg->blue - color->blue) * alpha + 0x8000) >> 16);
}
MetaFrameLayout*
meta_frame_layout_new (void)
{
@ -418,17 +444,12 @@ meta_color_spec_render (MetaColorSpec *spec,
case META_COLOR_SPEC_BLEND:
{
GdkColor fg, bg;
int alpha;
GdkColor bg, fg;
meta_color_spec_render (spec->data.blend.foreground, widget, &fg);
meta_color_spec_render (spec->data.blend.background, widget, &bg);
meta_color_spec_render (spec->data.blend.foreground, widget, &fg);
*color = fg;
alpha = spec->data.blend.alpha * 0xffff;
color->red = color->red + (((bg.red - color->red) * alpha + 0x8000) >> 16);
color->green = color->green + (((bg.green - color->green) * alpha + 0x8000) >> 16);
color->blue = color->blue + (((bg.blue - color->blue) * alpha + 0x8000) >> 16);
color_composite (&bg, &fg, spec->data.blend.alpha, color);
}
break;
}
@ -457,6 +478,11 @@ meta_texture_spec_new (MetaTextureType type)
case META_TEXTURE_IMAGE:
size += sizeof (dummy.data.image);
break;
case META_TEXTURE_COMPOSITE:
size += sizeof (dummy.data.composite);
break;
}
spec = g_malloc0 (size);
@ -487,6 +513,12 @@ meta_texture_spec_free (MetaTextureSpec *spec)
if (spec->data.image.pixbuf)
g_object_unref (G_OBJECT (spec->data.image.pixbuf));
break;
case META_TEXTURE_COMPOSITE:
if (spec->data.composite.background)
meta_texture_spec_free (spec->data.composite.background);
if (spec->data.composite.foreground)
meta_texture_spec_free (spec->data.composite.foreground);
}
g_free (spec);
@ -536,42 +568,130 @@ render_pixbuf (GdkDrawable *drawable,
}
void
meta_texture_spec_draw (const MetaTextureSpec *spec,
static void
render_pixbuf_aligned (GdkDrawable *drawable,
const GdkRectangle *clip,
GdkPixbuf *pixbuf,
double xalign,
double yalign,
int x,
int y,
int width,
int height)
{
int pix_width;
int pix_height;
int rx, ry;
pix_width = gdk_pixbuf_get_width (pixbuf);
pix_height = gdk_pixbuf_get_height (pixbuf);
rx = x + (width - pix_width) * xalign;
ry = y + (height - pix_height) * yalign;
render_pixbuf (drawable, clip, pixbuf, rx, ry);
}
static GdkPixbuf*
multiply_alpha (GdkPixbuf *pixbuf,
guchar alpha)
{
GdkPixbuf *new_pixbuf;
guchar *pixels;
int rowstride;
int height;
int row;
if (alpha == 255)
return pixbuf;
if (!gdk_pixbuf_get_has_alpha (pixbuf))
{
new_pixbuf = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0);
g_object_unref (G_OBJECT (pixbuf));
pixbuf = new_pixbuf;
}
pixels = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
row = 0;
while (row < height)
{
guchar *p;
guchar *end;
p = pixels + row * rowstride;
end = p + rowstride;
while (p != end)
{
p += 3; /* skip RGB */
/* multiply the two alpha channels. not sure this is right.
* but some end cases are that if the pixbuf contains 255,
* then it should be modified to contain "alpha"; if the
* pixbuf contains 0, it should remain 0.
*/
*p = (*p * alpha) / 65025; /* (*p / 255) * (alpha / 255); */
++p; /* skip A */
}
++row;
}
return pixbuf;
}
static GdkPixbuf*
meta_texture_spec_render (const MetaTextureSpec *spec,
GtkWidget *widget,
GdkDrawable *drawable,
const GdkRectangle *clip,
MetaTextureDrawMode mode,
int x,
int y,
guchar alpha,
int width,
int height)
{
g_return_if_fail (spec != NULL);
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (widget->style != NULL);
GdkPixbuf *pixbuf;
pixbuf = NULL;
g_return_val_if_fail (spec != NULL, NULL);
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
g_return_val_if_fail (widget->style != NULL, NULL);
switch (spec->type)
{
case META_TEXTURE_SOLID:
{
GdkGC *gc;
GdkGCValues values;
GdkColor color;
g_return_if_fail (spec->data.solid.color_spec != NULL);
g_return_val_if_fail (spec->data.solid.color_spec != NULL,
NULL);
meta_color_spec_render (spec->data.solid.color_spec,
widget,
&values.foreground);
widget, &color);
gdk_rgb_find_color (widget->style->colormap, &values.foreground);
gc = gdk_gc_new_with_values (drawable, &values, GDK_GC_FOREGROUND);
if (alpha == 255)
{
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
FALSE,
8, width, height);
gdk_pixbuf_fill (pixbuf, GDK_COLOR_RGBA (color));
}
else
{
guint32 rgba;
gdk_draw_rectangle (drawable,
gc, TRUE, x, y, width, height);
g_object_unref (G_OBJECT (gc));
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
TRUE,
8, width, height);
rgba = GDK_COLOR_RGBA (color);
rgba &= ~0xff;
rgba |= alpha;
gdk_pixbuf_fill (pixbuf, rgba);
}
}
break;
@ -579,17 +699,13 @@ meta_texture_spec_draw (const MetaTextureSpec *spec,
{
GdkPixbuf *pixbuf;
g_return_if_fail (spec->data.gradient.gradient_spec != NULL);
g_return_val_if_fail (spec->data.gradient.gradient_spec != NULL,
NULL);
pixbuf = meta_gradient_spec_render (spec->data.gradient.gradient_spec,
widget, width, height);
if (pixbuf == NULL)
return;
render_pixbuf (drawable, clip, pixbuf, x, y);
g_object_unref (G_OBJECT (pixbuf));
pixbuf = multiply_alpha (pixbuf, alpha);
}
break;
@ -597,7 +713,8 @@ meta_texture_spec_draw (const MetaTextureSpec *spec,
{
GdkPixbuf *pixbuf;
g_return_if_fail (spec->data.image.pixbuf != NULL);
g_return_val_if_fail (spec->data.image.pixbuf != NULL,
NULL);
pixbuf = NULL;
@ -619,8 +736,6 @@ meta_texture_spec_draw (const MetaTextureSpec *spec,
gdk_pixbuf_get_width (pixbuf),
height,
GDK_INTERP_BILINEAR);
if (pixbuf == NULL)
return;
}
break;
case META_TEXTURE_DRAW_SCALED_HORIZONTALLY:
@ -635,8 +750,6 @@ meta_texture_spec_draw (const MetaTextureSpec *spec,
width,
gdk_pixbuf_get_height (pixbuf),
GDK_INTERP_BILINEAR);
if (pixbuf == NULL)
return;
}
break;
case META_TEXTURE_DRAW_SCALED_BOTH:
@ -651,17 +764,422 @@ meta_texture_spec_draw (const MetaTextureSpec *spec,
pixbuf = gdk_pixbuf_scale_simple (pixbuf,
width, height,
GDK_INTERP_BILINEAR);
if (pixbuf == NULL)
return;
}
break;
}
g_return_if_fail (pixbuf != NULL);
pixbuf = multiply_alpha (pixbuf, alpha);
}
break;
render_pixbuf (drawable, clip, pixbuf, x, y);
case META_TEXTURE_COMPOSITE:
break;
}
return pixbuf;
}
static void
draw_color_rectangle (GtkWidget *widget,
GdkDrawable *drawable,
GdkColor *color,
const GdkRectangle *clip,
int x,
int y,
int width,
int height)
{
GdkGC *gc;
GdkGCValues values;
values.foreground = *color;
gdk_rgb_find_color (widget->style->colormap, &values.foreground);
gc = gdk_gc_new_with_values (drawable, &values, GDK_GC_FOREGROUND);
if (clip)
gdk_gc_set_clip_rectangle (gc,
(GdkRectangle*) clip); /* const cast */
gdk_draw_rectangle (drawable,
gc, TRUE, x, y, width, height);
g_object_unref (G_OBJECT (gc));
}
static void
draw_bg_solid_composite (const MetaTextureSpec *bg,
const MetaTextureSpec *fg,
double alpha,
GtkWidget *widget,
GdkDrawable *drawable,
const GdkRectangle *clip,
MetaTextureDrawMode mode,
double xalign,
double yalign,
int x,
int y,
int width,
int height)
{
GdkColor bg_color;
g_assert (bg->type == META_TEXTURE_SOLID);
g_assert (fg->type != META_TEXTURE_COMPOSITE);
meta_color_spec_render (bg->data.solid.color_spec,
widget,
&bg_color);
switch (fg->type)
{
case META_TEXTURE_SOLID:
{
GdkColor fg_color;
meta_color_spec_render (fg->data.solid.color_spec,
widget,
&fg_color);
color_composite (&bg_color, &fg_color,
alpha, &fg_color);
draw_color_rectangle (widget, drawable, &fg_color, clip,
x, y, width, height);
}
break;
case META_TEXTURE_GRADIENT:
/* FIXME I think we could just composite all the colors in
* the gradient prior to generating the gradient?
*/
/* FALL THRU */
case META_TEXTURE_IMAGE:
{
GdkPixbuf *pixbuf;
GdkPixbuf *composited;
pixbuf = meta_texture_spec_render (fg, widget, mode, 255,
width, height);
if (pixbuf == NULL)
return;
composited = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
gdk_pixbuf_get_has_alpha (pixbuf), 8,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf));
if (composited == NULL)
{
g_object_unref (G_OBJECT (pixbuf));
return;
}
gdk_pixbuf_composite_color (pixbuf,
composited,
0, 0,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
0.0, 0.0, /* offsets */
1.0, 1.0, /* scale */
GDK_INTERP_BILINEAR,
255 * alpha,
0, 0, /* check offsets */
0, /* check size */
GDK_COLOR_RGB (bg_color),
GDK_COLOR_RGB (bg_color));
/* Need to draw background since pixbuf is not
* necessarily covering the whole thing
*/
draw_color_rectangle (widget, drawable, &bg_color, clip,
x, y, width, height);
render_pixbuf_aligned (drawable, clip, composited,
xalign, yalign,
x, y, width, height);
g_object_unref (G_OBJECT (pixbuf));
g_object_unref (G_OBJECT (composited));
}
break;
case META_TEXTURE_COMPOSITE:
g_assert_not_reached ();
break;
}
}
static void
draw_bg_gradient_composite (const MetaTextureSpec *bg,
const MetaTextureSpec *fg,
double alpha,
GtkWidget *widget,
GdkDrawable *drawable,
const GdkRectangle *clip,
MetaTextureDrawMode mode,
double xalign,
double yalign,
int x,
int y,
int width,
int height)
{
g_assert (bg->type == META_TEXTURE_GRADIENT);
g_assert (fg->type != META_TEXTURE_COMPOSITE);
switch (fg->type)
{
case META_TEXTURE_SOLID:
case META_TEXTURE_GRADIENT:
case META_TEXTURE_IMAGE:
{
GdkPixbuf *bg_pixbuf;
GdkPixbuf *fg_pixbuf;
GdkPixbuf *composited;
int fg_width, fg_height;
bg_pixbuf = meta_texture_spec_render (bg, widget, mode, 255,
width, height);
if (bg_pixbuf == NULL)
return;
fg_pixbuf = meta_texture_spec_render (fg, widget, mode, 255,
width, height);
if (fg_pixbuf == NULL)
{
g_object_unref (G_OBJECT (bg_pixbuf));
return;
}
/* gradients always fill the entire target area */
g_assert (gdk_pixbuf_get_width (bg_pixbuf) == width);
g_assert (gdk_pixbuf_get_height (bg_pixbuf) == height);
composited = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
gdk_pixbuf_get_has_alpha (bg_pixbuf), 8,
gdk_pixbuf_get_width (bg_pixbuf),
gdk_pixbuf_get_height (bg_pixbuf));
if (composited == NULL)
{
g_object_unref (G_OBJECT (bg_pixbuf));
g_object_unref (G_OBJECT (fg_pixbuf));
return;
}
fg_width = gdk_pixbuf_get_width (fg_pixbuf);
fg_height = gdk_pixbuf_get_height (fg_pixbuf);
/* If we wanted to be all cool we could deal with the
* offsets and try to composite only in the clip rectangle,
* but I just don't care enough to figure it out.
*/
gdk_pixbuf_composite (fg_pixbuf,
composited,
x + (width - fg_width) * xalign,
y + (height - fg_height) * yalign,
gdk_pixbuf_get_width (fg_pixbuf),
gdk_pixbuf_get_height (fg_pixbuf),
0.0, 0.0, /* offsets */
1.0, 1.0, /* scale */
GDK_INTERP_BILINEAR,
255 * alpha);
render_pixbuf (drawable, clip, composited, x, y);
g_object_unref (G_OBJECT (bg_pixbuf));
g_object_unref (G_OBJECT (fg_pixbuf));
g_object_unref (G_OBJECT (composited));
}
break;
case META_TEXTURE_COMPOSITE:
g_assert_not_reached ();
break;
}
}
static void
draw_bg_image_composite (const MetaTextureSpec *bg,
const MetaTextureSpec *fg,
double alpha,
GtkWidget *widget,
GdkDrawable *drawable,
const GdkRectangle *clip,
MetaTextureDrawMode mode,
double xalign,
double yalign,
int x,
int y,
int width,
int height)
{
g_assert (bg->type == META_TEXTURE_IMAGE);
g_assert (fg->type != META_TEXTURE_COMPOSITE);
/* This one is tricky since the image doesn't cover the entire x,y
* width, height rectangle, so we need to handle the fact that there
* may be existing stuff in the uncovered portions of the drawable
* that we need to composite over the top of.
*
* i.e. the "bg" we are compositing onto is equivalent to the image
* composited over the top of whatever is already in the drawable.
*
* To implement this we just draw the background to drawable, then
* render the foreground to a pixbuf, multiply its alpha channel by
* the composite alpha, then composite the foreground onto the
* drawable.
*/
switch (fg->type)
{
case META_TEXTURE_SOLID:
case META_TEXTURE_GRADIENT:
case META_TEXTURE_IMAGE:
{
GdkPixbuf *bg_pixbuf, *fg_pixbuf;
bg_pixbuf = meta_texture_spec_render (bg, widget, mode, 255,
width, height);
if (bg_pixbuf == NULL)
return;
/* fg_pixbuf has its alpha multiplied, note */
fg_pixbuf = meta_texture_spec_render (fg, widget, mode,
255 * alpha,
width, height);
if (fg_pixbuf == NULL)
{
g_object_unref (G_OBJECT (bg_pixbuf));
return;
}
render_pixbuf_aligned (drawable, clip, bg_pixbuf,
xalign, yalign,
x, y, width, height);
render_pixbuf_aligned (drawable, clip, fg_pixbuf,
xalign, yalign,
x, y, width, height);
g_object_unref (G_OBJECT (bg_pixbuf));
g_object_unref (G_OBJECT (fg_pixbuf));
}
break;
case META_TEXTURE_COMPOSITE:
g_assert_not_reached ();
break;
}
}
void
meta_texture_spec_draw (const MetaTextureSpec *spec,
GtkWidget *widget,
GdkDrawable *drawable,
const GdkRectangle *clip,
MetaTextureDrawMode mode,
double xalign,
double yalign,
int x,
int y,
int width,
int height)
{
g_return_if_fail (spec != NULL);
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (widget->style != NULL);
switch (spec->type)
{
case META_TEXTURE_SOLID:
{
GdkColor color;
g_return_if_fail (spec->data.solid.color_spec != NULL);
meta_color_spec_render (spec->data.solid.color_spec,
widget, &color);
draw_color_rectangle (widget, drawable, &color, clip,
x, y, width, height);
}
break;
case META_TEXTURE_GRADIENT:
case META_TEXTURE_IMAGE:
{
GdkPixbuf *pixbuf;
g_return_if_fail (spec->data.gradient.gradient_spec != NULL);
pixbuf = meta_texture_spec_render (spec, widget, mode, 255,
width, height);
if (pixbuf == NULL)
return;
render_pixbuf_aligned (drawable, clip, pixbuf,
xalign, yalign,
x, y, width, height);
g_object_unref (G_OBJECT (pixbuf));
}
break;
case META_TEXTURE_COMPOSITE:
{
MetaTextureSpec *fg;
MetaTextureSpec *bg;
/* We could just render both things to a pixbuf then squish them
* but we are instead going to try to be all optimized for
* certain cases.
*/
fg = spec->data.composite.foreground;
bg = spec->data.composite.background;
g_return_if_fail (fg != NULL);
g_return_if_fail (bg != NULL);
g_return_if_fail (fg->type != META_TEXTURE_COMPOSITE);
g_return_if_fail (bg->type != META_TEXTURE_COMPOSITE);
switch (bg->type)
{
case META_TEXTURE_SOLID:
draw_bg_solid_composite (bg, fg, spec->data.composite.alpha,
widget, drawable, clip, mode,
xalign, yalign,
x, y, width, height);
break;
case META_TEXTURE_GRADIENT:
draw_bg_gradient_composite (bg, fg, spec->data.composite.alpha,
widget, drawable, clip, mode,
xalign, yalign,
x, y, width, height);
break;
case META_TEXTURE_IMAGE:
draw_bg_image_composite (bg, fg, spec->data.composite.alpha,
widget, drawable, clip, mode,
xalign, yalign,
x, y, width, height);
break;
case META_TEXTURE_COMPOSITE:
g_assert_not_reached ();
break;
}
}
break;
}

13
src/theme.h
View File

@ -130,7 +130,8 @@ typedef enum
{
META_TEXTURE_SOLID,
META_TEXTURE_GRADIENT,
META_TEXTURE_IMAGE
META_TEXTURE_IMAGE,
META_TEXTURE_COMPOSITE
} MetaTextureType;
typedef enum
@ -156,6 +157,11 @@ struct _MetaTextureSpec
struct {
GdkPixbuf *pixbuf;
} image;
struct {
MetaTextureSpec *background;
MetaTextureSpec *foreground;
double alpha;
} composite;
} data;
};
@ -334,6 +340,11 @@ void meta_texture_spec_draw (const MetaTextureSpec *desc,
GdkDrawable *drawable,
const GdkRectangle *clip,
MetaTextureDrawMode mode,
/* How to align a texture
* smaller than the given area
*/
double xalign,
double yalign,
/* logical region being drawn,
* scale to this area if in SCALED
* mode