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Scale SVGs accurately in the viewing widget

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Přemysl Eric Janouch 2022-01-23 02:36:24 +01:00
parent 07e7d39ea2
commit 6ce5c7c2b6
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 51 additions and 12 deletions
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63
fiv-view.c
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@ -53,6 +53,7 @@ struct _FivView {
gchar *uri; ///< Path to the current image (if any)
cairo_surface_t *image; ///< The loaded image (sequence)
cairo_surface_t *page; ///< Current page within image, weak
cairo_surface_t *page_scaled; ///< Current page within image, scaled
cairo_surface_t *frame; ///< Current frame within page, weak
FivIoOrientation orientation; ///< Current page orientation
bool enable_cms : 1; ///< Smooth scaling toggle
@ -144,6 +145,7 @@ fiv_view_finalize(GObject *gobject)
g_clear_pointer(&self->screen_cms_profile, fiv_io_profile_free);
g_clear_pointer(&self->enhance_swap, cairo_surface_destroy);
g_clear_pointer(&self->image, cairo_surface_destroy);
g_clear_pointer(&self->page_scaled, cairo_surface_destroy);
g_free(self->uri);
G_OBJECT_CLASS(fiv_view_parent_class)->finalize(gobject);
@ -274,6 +276,24 @@ fiv_view_get_preferred_width(GtkWidget *widget, gint *minimum, gint *natural)
}
}
static void
prescale_page(FivView *self)
{
FivIoRenderClosure *closure =
cairo_surface_get_user_data(self->page, &fiv_io_key_render);
if (!closure)
return;
// TODO(p): Restart the animation. No vector formats currently animate.
g_return_if_fail(!self->frame_update_connection);
// If it fails, the previous frame pointer may become invalid.
g_clear_pointer(&self->page_scaled, cairo_surface_destroy);
self->frame = self->page_scaled = closure->render(closure, self->scale);
if (!self->page_scaled)
self->frame = self->page;
}
static void
fiv_view_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
{
@ -284,13 +304,17 @@ fiv_view_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
return;
Dimensions surface_dimensions = get_surface_dimensions(self);
self->scale = 1;
double scale = 1;
if (ceil(surface_dimensions.width * scale) > allocation->width)
scale = allocation->width / surface_dimensions.width;
if (ceil(surface_dimensions.height * scale) > allocation->height)
scale = allocation->height / surface_dimensions.height;
if (ceil(surface_dimensions.width * self->scale) > allocation->width)
self->scale = allocation->width / surface_dimensions.width;
if (ceil(surface_dimensions.height * self->scale) > allocation->height)
self->scale = allocation->height / surface_dimensions.height;
g_object_notify_by_pspec(G_OBJECT(widget), view_properties[PROP_SCALE]);
if (self->scale != scale) {
self->scale = scale;
g_object_notify_by_pspec(G_OBJECT(widget), view_properties[PROP_SCALE]);
prescale_page(self);
}
}
// https://www.freedesktop.org/wiki/OpenIcc/ICC_Profiles_in_X_Specification_0.4
@ -409,9 +433,9 @@ fiv_view_draw(GtkWidget *widget, cairo_t *cr)
y = round((allocation.height - h) / 2.);
Dimensions surface_dimensions = {};
cairo_matrix_t matrix =
fiv_io_orientation_apply(self->page, self->orientation,
&surface_dimensions.width, &surface_dimensions.height);
cairo_matrix_t matrix = fiv_io_orientation_apply(
self->page_scaled ? self->page_scaled : self->page, self->orientation,
&surface_dimensions.width, &surface_dimensions.height);
cairo_translate(cr, x, y);
if (self->checkerboard) {
@ -421,6 +445,14 @@ fiv_view_draw(GtkWidget *widget, cairo_t *cr)
gtk_style_context_restore(style);
}
// Then all frames are pre-scaled.
if (self->page_scaled) {
cairo_set_source_surface(cr, self->frame, 0, 0);
cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
cairo_paint(cr);
return TRUE;
}
// FIXME: Recording surfaces do not work well with CAIRO_SURFACE_TYPE_XLIB,
// we always get a shitty pixmap, where transparency contains junk.
if (cairo_surface_get_type(self->frame) == CAIRO_SURFACE_TYPE_RECORDING) {
@ -497,9 +529,13 @@ set_scale_to_fit(FivView *self, bool scale_to_fit)
static gboolean
set_scale(FivView *self, double scale)
{
self->scale = scale;
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_SCALE]);
gtk_widget_queue_resize(GTK_WIDGET(self));
if (self->scale != scale) {
self->scale = scale;
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_SCALE]);
prescale_page(self);
gtk_widget_queue_resize(GTK_WIDGET(self));
}
return set_scale_to_fit(self, false);
}
@ -638,7 +674,10 @@ start_animating(FivView *self)
static void
switch_page(FivView *self, cairo_surface_t *page)
{
g_clear_pointer(&self->page_scaled, cairo_surface_destroy);
self->frame = self->page = page;
prescale_page(self);
if ((self->orientation = (uintptr_t) cairo_surface_get_user_data(
self->page, &fiv_io_key_orientation)) == FivIoOrientationUnknown)
self->orientation = FivIoOrientation0;