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added several preview generatio modes (2x speedup), needs more tuning...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2013-07-07 22:20:41 +04:00
parent 3415f57140
commit efbdac7e9d
1 changed files with 42 additions and 21 deletions
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61
ui/compatibility.js
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@ -127,19 +127,31 @@ if(window.CEF_dumpJSON != null){
// preview generation...
//
// NOTE: this will add already existing previews to IMAGES[gid]...
//
// XXX possible modes:
// - fast
// make previews using nearest rscale (factor=1)
// possible modes:
// - optimized
// use closest rscale and minimal factor
// previews might get artifacts associated with small scale factors
// 0.55x time
// - best
// only use scale factor (rscale=1)
// 1x time (fixed set of previews: 1280, 150, 350, 900)
// - fast
// make previews using nearest rscale (factor is rounded)
// will produce inexact sizes
// 0.42x time
// - rscale
// only use rscale (factor=1)
// produces only fixed size previews
// 0.32x time
//
// NOTE: rscale should be used for exactly tuned preview sizes...
// NOTE: this will add already existing previews to IMAGES[gid]...
//
// XXX get image size without loading the image...
// XXX make this not just vips-specific...
// XXX path handling is a mess...
window.makeImagePreviews = function(gid, sizes){
window.makeImagePreviews = function(gid, sizes, mode){
mode = mode == null ? 'optimized' : mode
var img = IMAGES[gid]
var source = normalizePath(img.path)
@ -166,14 +178,13 @@ if(window.CEF_dumpJSON != null){
var cmd = 'vips im_header_int width "$IN"'
.replace(/\$IN/g, source.replace(fp, ''))
proc.exec(cmd, function(error, stdout, stderr){
width_getter.resolve(parseInt(stdout))
width_getter.resolve(parseInt(stdout.trim()))
})
var height_getter = $.Deferred()
var cmd = 'vips im_header_int height "$IN"'
.replace(/\$IN/g, source.replace(fp, ''))
proc.exec(cmd, function(error, stdout, stderr){
height_getter.resolve(parseInt(stdout))
height_getter.resolve(parseInt(stdout.trim()))
})
$.when(width_getter, height_getter)
@ -181,15 +192,6 @@ if(window.CEF_dumpJSON != null){
size_getter.resolve(Math.max(w, h))
})
/*
// XXX this may get REALLY SLOW for BIG images...
var size_getter = $.Deferred()
var _i = new Image()
_i.onload = function(){
size_getter.resolve(Math.max(parseInt(this.width), parseInt(this.height)))
}
_i.src = source
*/
for(var i=0; i < sizes.length; i++){
var size = sizes[i]
@ -235,6 +237,22 @@ if(window.CEF_dumpJSON != null){
// this can be 1, 2, 4 or 8...
var rscale = 1
// speed things up with read-scaling and rounding the scale factor...
if(mode == 'fast' || mode == 'optimized' || mode == 'rscale'){
while(rscale < 8){
if(rscale*2 >= factor){
break
}
rscale *= 2
}
factor = factor / rscale
}
if(mode == 'fast'){
factor = Math.round(factor)
} else if(mode == 'rscale'){
factor = 1
}
// XXX make this compatible with other image processors...
var cmd = 'vips im_shrink "$IN:$RSCALE" "$OUT:$COMPRESSION" $FACTOR $FACTOR'
.replace(/\$RSCALE/g, rscale)
@ -243,6 +261,8 @@ if(window.CEF_dumpJSON != null){
.replace(/\$COMPRESSION/g, compression)
.replace(/\$FACTOR/g, factor)
console.log(cmd)
proc.exec(cmd, function(error, stdout, stderr){
if(error != null){
//console.error('>>> Error: preview:', stderr)
@ -250,6 +270,7 @@ if(window.CEF_dumpJSON != null){
deferred.reject()
} else {
// XXX use real size of the preview generated (???)
//console.log('>>> Preview:', name, '('+size+'): Done.')
deferred.notify(gid, size, 'done')
// update the image structure...
@ -287,7 +308,7 @@ if(window.CEF_dumpJSON != null){
// NOTE: this will remove the old deferred if it us resolved, thus
// clearing the "log" of previous operations, unless keep_log
// is set to true...
window.makeImagesPreviewsQ = function(gids, keep_log){
window.makeImagesPreviewsQ = function(gids, keep_log, mode){
var previews = []
$.each(gids, function(i, e){
@ -308,7 +329,7 @@ if(window.CEF_dumpJSON != null){
// append to deffered queue...
last.always(function(){
makeImagePreviews(e)
makeImagePreviews(e, null, mode)
.progress(function(state){
deferred.notify(state)
})