155c17c99a
*This is a recent regression, which I stumbled upon while working on cleaning-up the gulpfile related to `pdf.sandbox.js` building.* By placing the `ColorConverters` functionality in the `src/display/display_utils.js` file, you end up including a *significant* chunk of the `pdf.js` file in the built `pdf.scripting.js`/`pdf.sandbox.js` files. Given that I cannot imagine that this was actually intended, since it inflates the built files with unnecessary/unused code, this moves `ColorConverters` to a new file instead (thus breaking the dependencies). To hopefully reduce the risk future bugs, along these lines, a big comment is also placed at the top of the new file. Finally, the `ColorConverters` is converted to a class with static methods, since this felt slightly cleaner overall.
86 lines
2.1 KiB
JavaScript
86 lines
2.1 KiB
JavaScript
/* Copyright 2020 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* PLEASE NOTE: This file is currently imported in both the `../display/` and
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* `../scripting_api/` folders, hence be EXTREMELY careful about
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* introducing any dependencies here since that can lead to an
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* unexpected/unnecessary size increase of the *built* files.
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*/
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function makeColorComp(n) {
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return Math.floor(Math.max(0, Math.min(1, n)) * 255)
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.toString(16)
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.padStart(2, "0");
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}
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// PDF specifications section 10.3
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class ColorConverters {
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static CMYK_G([c, y, m, k]) {
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return ["G", 1 - Math.min(1, 0.3 * c + 0.59 * m + 0.11 * y + k)];
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}
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static G_CMYK([g]) {
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return ["CMYK", 0, 0, 0, 1 - g];
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}
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static G_RGB([g]) {
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return ["RGB", g, g, g];
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}
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static G_HTML([g]) {
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const G = makeColorComp(g);
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return `#${G}${G}${G}`;
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}
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static RGB_G([r, g, b]) {
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return ["G", 0.3 * r + 0.59 * g + 0.11 * b];
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}
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static RGB_HTML([r, g, b]) {
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const R = makeColorComp(r);
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const G = makeColorComp(g);
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const B = makeColorComp(b);
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return `#${R}${G}${B}`;
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}
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static T_HTML() {
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return "#00000000";
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}
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static CMYK_RGB([c, y, m, k]) {
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return [
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"RGB",
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1 - Math.min(1, c + k),
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1 - Math.min(1, m + k),
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1 - Math.min(1, y + k),
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];
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}
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static CMYK_HTML(components) {
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return this.RGB_HTML(this.CMYK_RGB(components));
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}
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static RGB_CMYK([r, g, b]) {
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const c = 1 - r;
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const m = 1 - g;
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const y = 1 - b;
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const k = Math.min(c, m, y);
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return ["CMYK", c, m, y, k];
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}
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}
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export { ColorConverters };
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