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new preview generation modes, now fast_f is default (better performance/quality trade-off -- more browser scaling, less mush), more tweaking...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2013-07-08 04:36:59 +04:00
parent 16abec2615
commit c5f223c473
1 changed files with 21 additions and 9 deletions
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30
ui/compatibility.js
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@ -179,18 +179,21 @@ if(window.CEF_dumpJSON != null){
// - optimized
// use closest rscale and minimal factor
// previews might get artifacts associated with small scale factors
// 0.55x time
// 0.5x time
// - best
// only use scale factor (rscale=1)
// 1x time (fixed set of previews: 1280, 150, 350, 900)
// - fast
// - fast_r
// make previews using nearest rscale (factor is rounded)
// will produce inexact sizes
// 0.42x time
// will produce inexact preview sizes
// 0.4x time
// - fast_f
// same as fast_r but factor is floored rather than rounded
// will priduce previews the same size or larger than requested
// - rscale
// only use rscale (factor=1)
// produces only fixed size previews
// 0.32x time
// 0.3x time
//
// NOTE: rscale should be used for exactly tuned preview sizes...
// NOTE: this will add already existing previews to IMAGES[gid]...
@ -198,7 +201,8 @@ if(window.CEF_dumpJSON != null){
// XXX make this not just vips-specific...
// XXX path handling is a mess...
window.makeImagePreviews = function(gid, sizes, mode, no_update_loaded){
mode = mode == null ? 'optimized' : mode
//mode = mode == null ? 'optimized' : mode
mode = mode == null ? 'fast_f' : mode
var img = IMAGES[gid]
var source = normalizePath(img.path)
@ -266,7 +270,7 @@ if(window.CEF_dumpJSON != null){
var rscale = 1
// speed things up with read-scaling and rounding the scale factor...
if(mode == 'fast' || mode == 'optimized' || mode == 'rscale'){
if(['fast_r', 'fast_f', 'optimized', 'rscale'].indexOf(mode) >= 0){
while(rscale < 8){
if(rscale*2 >= factor){
break
@ -275,8 +279,16 @@ if(window.CEF_dumpJSON != null){
}
factor = factor / rscale
}
if(mode == 'fast'){
factor = Math.round(factor)
// factor processing...
if(mode == 'fast_r'){
factor = Math.max(Math.round(factor), 1)
} else if(mode == 'fast_f'){
// NOTE: .floor(...) will make the images larger than
// the requested size, this will avaoid scale-up
// artifacts...
factor = Math.max(Math.floor(factor), 1)
} else if(mode == 'rscale'){
factor = 1
}