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- Reworked GTK window snapshotting in the main GUI to capture into cairo surfaces and convert via gdk_pixbuf_get_from_surface.

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- Added a Cairo surface → RGBA pixbuf conversion helper that unpremultiplies ARGB32 data for GTK2 compatibility while keeping window snapshots Cairo-based.
- Updated window snapshotting to use the new Cairo surface conversion instead of gdk_pixbuf_get_from_surface
This commit is contained in:
deepend
2026-01-17 22:25:12 -07:00
parent c1f855c2ab
commit cf41615cb3
2 changed files with 110 additions and 76 deletions
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83
src/fe-gtk/xtext.c
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@@ -59,7 +59,6 @@
#else
#include <unistd.h>
#include <gdk/gdkcairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
@@ -159,26 +158,20 @@ xtext_set_source_color (cairo_t *cr, const XTextColor *color, gdouble alpha)
}
static cairo_surface_t *
xtext_surface_from_pixbuf (GdkPixbuf *pixbuf)
xtext_surface_from_window (GdkWindow *window)
{
cairo_surface_t *surface;
gboolean has_alpha;
cairo_surface_t *surface = NULL;
int width;
int height;
int src_stride;
int dest_stride;
int n_channels;
const guchar *src_pixels;
unsigned char *dest_pixels;
int x;
int y;
cairo_t *cr;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
if (!window)
return NULL;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
width = gdk_window_get_width (window);
height = gdk_window_get_height (window);
if (width <= 0 || height <= 0)
return NULL;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS)
@@ -187,60 +180,10 @@ xtext_surface_from_pixbuf (GdkPixbuf *pixbuf)
return NULL;
}
src_stride = gdk_pixbuf_get_rowstride (pixbuf);
src_pixels = gdk_pixbuf_get_pixels (pixbuf);
dest_stride = cairo_image_surface_get_stride (surface);
dest_pixels = cairo_image_surface_get_data (surface);
for (y = 0; y < height; y++)
{
const guchar *src_row = src_pixels + (y * src_stride);
guint32 *dest_row = (guint32 *)(dest_pixels + (y * dest_stride));
for (x = 0; x < width; x++)
{
const guchar *src = src_row + (x * n_channels);
guchar alpha = has_alpha ? src[3] : 0xff;
guchar red = src[0];
guchar green = src[1];
guchar blue = src[2];
guchar premul_red = (guchar)((red * alpha + 127) / 255);
guchar premul_green = (guchar)((green * alpha + 127) / 255);
guchar premul_blue = (guchar)((blue * alpha + 127) / 255);
dest_row[x] = ((guint32)alpha << 24) |
((guint32)premul_red << 16) |
((guint32)premul_green << 8) |
((guint32)premul_blue);
}
}
cairo_surface_mark_dirty (surface);
return surface;
}
static cairo_surface_t *
xtext_surface_from_window (GdkWindow *window)
{
cairo_surface_t *surface = NULL;
GdkPixbuf *pixbuf;
GdkDrawable *drawable;
int width;
int height;
drawable = GDK_DRAWABLE (window);
if (!drawable)
return NULL;
gdk_drawable_get_size (drawable, &width, &height);
pixbuf = gdk_pixbuf_get_from_drawable (NULL, drawable, NULL,
0, 0, 0, 0, width, height);
if (pixbuf)
{
surface = xtext_surface_from_pixbuf (pixbuf);
g_object_unref (pixbuf);
}
cr = cairo_create (surface);
gdk_cairo_set_source_window (cr, window, 0.0, 0.0);
cairo_paint (cr);
cairo_destroy (cr);
return surface;
}