joachim/openwebrx-clone
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restore linear interpolation to improve performance

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This commit is contained in:
Jakob Ketterl 2020-09-19 15:51:54 +02:00
parent a3285d5943
commit 31295efbff
1 changed files with 17 additions and 11 deletions
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28
htdocs/openwebrx.js
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@ -77,9 +77,13 @@ var waterfall_min_level;
var waterfall_max_level;
var waterfall_min_level_default;
var waterfall_max_level_default;
var waterfall_colors = chroma.scale(['#000', '#FFF']);
var waterfall_colors = buildWaterfallColors(['#000', '#FFF'])
var waterfall_auto_level_margin;
function buildWaterfallColors(input) {
return chroma.scale(input).colors(256, 'rgb')
}
function updateWaterfallColors(which) {
var $wfmax = $("#openwebrx-waterfall-color-max");
var $wfmin = $("#openwebrx-waterfall-color-min");
@ -700,7 +704,7 @@ function on_ws_recv(evt) {
switch (json.type) {
case "config":
var config = json['value'];
waterfall_colors = chroma.scale(config['waterfall_colors']);
waterfall_colors = buildWaterfallColors(config['waterfall_colors']);
waterfall_min_level_default = config['waterfall_min_level'];
waterfall_max_level_default = config['waterfall_max_level'];
waterfall_auto_level_margin = config['waterfall_auto_level_margin'];
@ -1209,16 +1213,18 @@ function open_websocket() {
function waterfall_mkcolor(db_value, waterfall_colors_arg) {
waterfall_colors_arg = waterfall_colors_arg || waterfall_colors;
var value_percent = (db_value - waterfall_min_level) / (waterfall_max_level - waterfall_min_level);
return waterfall_colors(Math.max(0, Math.min(1, value_percent)));
}
value_percent = Math.max(0, Math.min(1, value_percent));
var percent_for_one_color = 1 / (waterfall_colors_arg.length - 1);
var index = Math.floor(value_percent / percent_for_one_color);
var remain = (value_percent - percent_for_one_color * index) / percent_for_one_color;
return color_between(waterfall_colors_arg[index + 1], waterfall_colors_arg[index], remain);}
function color_between(first, second, percent) {
var output = 0;
for (var i = 0; i < 4; i++) {
var add = ((((first & (0xff << (i * 8))) >>> 0) * percent) + (((second & (0xff << (i * 8))) >>> 0) * (1 - percent))) & (0xff << (i * 8));
output |= add >>> 0;
var output = [];
for (var i = 0; i < 3; i++) {
output[i] = first[i] + percent * (first[i] - second[i]);
}
return output >>> 0;
return output;
}
@ -1304,7 +1310,7 @@ function waterfall_add(data) {
//Add line to waterfall image
var oneline_image = canvas_context.createImageData(w, 1);
for (var x = 0; x < w; x++) {
var color = waterfall_mkcolor(data[x]).rgb();
var color = waterfall_mkcolor(data[x]);
for (i = 0; i < 3; i++) oneline_image.data[x * 4 + i] = color[i];
oneline_image.data[x * 4 + 3] = 255;
}
@ -1612,7 +1618,7 @@ function secondary_demod_waterfall_add(data) {
//Add line to waterfall image
var oneline_image = secondary_demod_current_canvas_context.createImageData(w, 1);
for (var x = 0; x < w; x++) {
var color = waterfall_mkcolor(data[x] + secondary_demod_fft_offset_db).rgb();
var color = waterfall_mkcolor(data[x] + secondary_demod_fft_offset_db);
for (var i = 0; i < 3; i++) oneline_image.data[x * 4 + i] = color[i];
oneline_image.data[x * 4 + 3] = 255;
}