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Optimize thumbnail rendering 

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
Signed by: p
GPG Key ID: A0420B94F92B9493
2 changed files with 18 additions and 9 deletions
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14
fiv-browser.c
View File

@ -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),

13
fiv-io.c
View File

@ -2366,9 +2366,15 @@ read_spng_thumbnail(
}
struct spng_ihdr ihdr = {};
struct spng_trns trns = {};
spng_get_ihdr(ctx, &ihdr);
bool may_be_translucent = !spng_get_trns(ctx, &trns) ||
ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA ||
ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR_ALPHA;
cairo_surface_t *surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32, ihdr.width, ihdr.height);
may_be_translucent ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
ihdr.width, ihdr.height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
@ -2396,10 +2402,7 @@ read_spng_thumbnail(
}
// pixman can be mildly abused to do this operation, but it won't be faster.
struct spng_trns trns = {};
if (ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA ||
ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR_ALPHA ||
!spng_get_trns(ctx, &trns)) {
if (may_be_translucent) {
for (size_t i = size / sizeof *data; i--; ) {
const uint8_t *unit = (const uint8_t *) &data[i];
uint32_t a = unit[3],