[gtk/wip/alexl/broadway7: 87/87] broadway: Optionally support data: uris instead of blobs
- From: Alexander Larsson <alexl src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/alexl/broadway7: 87/87] broadway: Optionally support data: uris instead of blobs
- Date: Fri, 29 Mar 2019 13:33:11 +0000 (UTC)
commit 5bc8f8826f874bed635e383efbaf4953727dbe9c
Author: Alexander Larsson <alexl redhat com>
Date: Fri Mar 29 13:18:17 2019 +0100
broadway: Optionally support data: uris instead of blobs
This is nice when you want to make a "screenshot" by using save-as.
Its not going to perform as well though, so you have to enable it
by adding ?datauri to the url
gdk/broadway/broadway.js | 72 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 69 insertions(+), 3 deletions(-)
---
diff --git a/gdk/broadway/broadway.js b/gdk/broadway/broadway.js
index 0952399673..ba2fdcd727 100644
--- a/gdk/broadway/broadway.js
+++ b/gdk/broadway/broadway.js
@@ -93,6 +93,63 @@ const GDK_HYPER_MASK = 1 << 27;
const GDK_META_MASK = 1 << 28;
const GDK_RELEASE_MASK = 1 << 30;
+
+var useDataUrls = window.location.search.includes("datauri");
+
+/* This base64code is based on https://github.com/beatgammit/base64-js/blob/master/index.js which is MIT
licensed */
+
+var b64_lookup = [];
+var base64_code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+for (var i = 0, len = base64_code.length; i < len; ++i) {
+ b64_lookup[i] = base64_code[i];
+}
+
+function tripletToBase64 (num) {
+ return b64_lookup[num >> 18 & 0x3F] +
+ b64_lookup[num >> 12 & 0x3F] +
+ b64_lookup[num >> 6 & 0x3F] +
+ b64_lookup[num & 0x3F];
+}
+
+function encodeBase64Chunk (uint8, start, end) {
+ var tmp;
+ var output = [];
+ for (var i = start; i < end; i += 3) {
+ tmp =
+ ((uint8[i] << 16) & 0xFF0000) +
+ ((uint8[i + 1] << 8) & 0xFF00) +
+ (uint8[i + 2] & 0xFF);
+ output.push(tripletToBase64(tmp));
+ }
+ return output.join('');
+}
+
+function bytesToDataUri(uint8) {
+ var tmp;
+ var len = uint8.length;
+ var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
+ var parts = [];
+ var maxChunkLength = 16383; // must be multiple of 3
+
+ parts.push("data:image/png;base64,");
+
+ // go through the array every three bytes, we'll deal with trailing stuff later
+ for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
+ parts.push(encodeBase64Chunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)));
+ }
+
+ // pad the end with zeros, but make sure to not forget the extra bytes
+ if (extraBytes === 1) {
+ tmp = uint8[len - 1];
+ parts.push(b64_lookup[tmp >> 2] + b64_lookup[(tmp << 4) & 0x3F] + '==');
+ } else if (extraBytes === 2) {
+ tmp = (uint8[len - 2] << 8) + uint8[len - 1];
+ parts.push(b64_lookup[tmp >> 10] + b64_lookup[(tmp >> 4) & 0x3F] + b64_lookup[(tmp << 2) & 0x3F] +
'=');
+ }
+
+ return parts.join('');
+}
+
/* Helper functions for debugging */
var logDiv = null;
function log(str) {
@@ -202,8 +259,15 @@ function getButtonMask (button) {
}
function Texture(id, data) {
- var blob = new Blob([data],{type: "image/png"});
- this.url = window.URL.createObjectURL(blob);
+ var url;
+ if (useDataUrls) {
+ url = bytesToDataUri(data);
+ } else {
+ var blob = new Blob([data],{type: "image/png"});
+ url = window.URL.createObjectURL(blob);
+ }
+
+ this.url = url;
this.refcount = 1;
this.id = id;
@@ -221,7 +285,9 @@ Texture.prototype.ref = function() {
Texture.prototype.unref = function() {
this.refcount -= 1;
if (this.refcount == 0) {
- window.URL.revokeObjectURL(this.url);
+ if (this.url.startsWith("blob")) {
+ window.URL.revokeObjectURL(this.url);
+ }
delete textures[this.id];
}
}
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