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Optimize thumbnail rendering

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Massive responsivity gains have been achieved here.

Rescaling performance doesn't seem to be particularly affected.
This commit is contained in:
Přemysl Eric Janouch
2021-12-20 04:29:19 +01:00
parent 63955e881d
commit ada67f044a
2 changed files with 18 additions and 9 deletions
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14
fiv-browser.c
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@@ -254,8 +254,12 @@ draw_row(FivBrowser *self, cairo_t *cr, const Row *row)
border.top + extents.height + border.bottom);
}
gtk_render_background(
style, cr, border.left, border.top, extents.width, extents.height);
// Performance optimization--specifically targeting the checkerboard.
if (cairo_image_surface_get_format(item->entry->thumbnail) !=
CAIRO_FORMAT_RGB24) {
gtk_render_background(style, cr, border.left, border.top,
extents.width, extents.height);
}
gtk_render_frame(style, cr, 0, 0,
border.left + extents.width + border.right,
@@ -306,8 +310,9 @@ rescale_thumbnail(cairo_surface_t *thumbnail, double row_height)
int projected_width = round(scale_x * width);
int projected_height = round(scale_y * height);
cairo_format_t cairo_format = cairo_image_surface_get_format(thumbnail);
cairo_surface_t *scaled = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32, projected_width, projected_height);
cairo_format, projected_width, projected_height);
// pixman can take gamma into account when scaling, unlike Cairo.
struct pixman_f_transform xform_floating;
@@ -315,7 +320,8 @@ rescale_thumbnail(cairo_surface_t *thumbnail, double row_height)
// PIXMAN_a8r8g8b8_sRGB can be used for gamma-correct results,
// but it's an incredibly slow transformation
pixman_format_code_t format = PIXMAN_a8r8g8b8;
pixman_format_code_t format =
cairo_format == CAIRO_FORMAT_RGB24 ? PIXMAN_x8r8g8b8 : PIXMAN_a8r8g8b8;
pixman_image_t *src = pixman_image_create_bits(format, width, height,
(uint32_t *) cairo_image_surface_get_data(thumbnail),