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vm.plugins.jpeg2.browser.js
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vm.plugins.jpeg2.browser.js
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"use strict";
/*
* Copyright (c) 2013-2024 Vanessa Freudenberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
Object.extend(Squeak.Primitives.prototype,
'JPEGReadWriter2Plugin', {
jpeg2_primJPEGPluginIsPresent: function(argCount) {
return this.popNandPushIfOK(argCount + 1, this.vm.trueObj);
},
jpeg2_primImageHeight: function(argCount) {
var decompressStruct = this.stackNonInteger(0).wordsOrBytes();
if (!decompressStruct) return false;
var height = decompressStruct[1];
return this.popNandPushIfOK(argCount + 1, height);
},
jpeg2_primImageWidth: function(argCount) {
var decompressStruct = this.stackNonInteger(0).wordsOrBytes();
if (!decompressStruct) return false;
var width = decompressStruct[0];
return this.popNandPushIfOK(argCount + 1, width);
},
jpeg2_primJPEGCompressStructSize: function(argCount) {
// no struct needed
return this.popNandPushIfOK(argCount + 1, 0);
},
jpeg2_primJPEGDecompressStructSize: function(argCount) {
// width, height, 32 bits each
return this.popNandPushIfOK(argCount + 1, 8);
},
jpeg2_primJPEGErrorMgr2StructSize: function(argCount) {
// no struct needed
return this.popNandPushIfOK(argCount + 1, 0);
},
jpeg2_primJPEGReadHeaderfromByteArrayerrorMgr: function(argCount) {
var decompressStruct = this.stackNonInteger(2).wordsOrBytes(),
source = this.stackNonInteger(1).bytes;
if (!decompressStruct || !source) return false;
var unfreeze = this.vm.freeze();
this.jpeg2_readImageFromBytes(source,
function success(image) {
this.jpeg2state = {src: source, img: image};
decompressStruct[0] = image.width;
decompressStruct[1] = image.height;
unfreeze();
}.bind(this),
function error() {
decompressStruct[0] = 0;
decompressStruct[1] = 0;
unfreeze();
}.bind(this));
return this.popNIfOK(argCount);
},
jpeg2_primJPEGReadImagefromByteArrayonFormdoDitheringerrorMgr: function(argCount) {
var source = this.stackNonInteger(3).bytes,
form = this.stackNonInteger(2).pointers,
ditherFlag = this.stackBoolean(1);
if (!this.success || !source || !form) return false;
var state = this.jpeg2state;
if (!state || state.src !== source) {
console.error("jpeg read did not match header info");
return false;
}
var depth = form[Squeak.Form_depth],
image = this.jpeg2_getPixelsFromImage(state.img),
formBits = form[Squeak.Form_bits].words;
if (depth === 32) {
this.jpeg2_copyPixelsToForm32(image, formBits);
} else if (depth === 16) {
if (ditherFlag) this.jpeg2_ditherPixelsToForm16(image, formBits);
else this.jpeg2_copyPixelsToForm16(image, formBits);
} else return false;
return this.popNIfOK(argCount);
},
jpeg2_primJPEGWriteImageonByteArrayformqualityprogressiveJPEGerrorMgr: function(argCount) {
if (argCount < 6) return false;
var destination = this.stackNonInteger(4).bytes,
form = this.stackNonInteger(3).pointers,
quality = this.stackInteger(2);
// rest ignored
if (!this.success || !destination || !form) return false;
var formWidth = form[Squeak.Form_width],
formHeight = form[Squeak.Form_height],
formDepth = form[Squeak.Form_depth],
formBits = form[Squeak.Form_bits].words;
if (formDepth !== 32) {
this.vm.warnOnce("JPEG2WriteImage: only 32 bit depth supported");
return false;
}
var bytesCount = this.jpeg2_writeFormToBytes(formBits, formWidth, formHeight, quality, destination);
return this.popNandPushIfOK(argCount + 1, bytesCount);
},
jpeg2_writeFormToBytes: function(formBits, width, height, quality, destination) {
var canvas = document.createElement("canvas"),
context = canvas.getContext("2d");
canvas.width = width;
canvas.height = height;
var imageData = context.createImageData(width, height),
pixels = imageData.data;
for (var i = 0; i < formBits.length; i++) {
var pix = formBits[i];
pixels[i*4 + 0] = (pix >> 16) & 255;
pixels[i*4 + 1] = (pix >> 8) & 255;
pixels[i*4 + 2] = pix & 255;
pixels[i*4 + 3] = 255;
}
context.putImageData(imageData, 0, 0);
var jpeg = canvas.toDataURL("image/jpeg", quality / 100);
return this.jpeg2_dataURLToBytes(jpeg, destination);
},
jpeg2_dataURLToBytes: function(dataURL, destination) {
var base64 = dataURL.split(',')[1];
if (!base64) return 0;
var needed = base64.length * 3 / 4;
if (needed - 3 > destination.length) return 0;
var bytes = atob(base64);
if (bytes.length > destination.length) return 0;
for (var i = 0; i < bytes.length; i++)
destination[i] = bytes.charCodeAt(i);
return bytes.length;
},
jpeg2_readImageFromBytes: function(bytes, thenDo, errorDo) {
var blob = new Blob([bytes], {type: "image/jpeg"}),
image = new Image();
image.onload = function() {
thenDo(image);
URL.revokeObjectURL(image.src);
};
image.onerror = function() {
console.warn("could not render JPEG");
errorDo();
URL.revokeObjectURL(image.src);
};
image.src = URL.createObjectURL(blob);
},
jpeg2_getPixelsFromImage: function(image) {
var canvas = document.createElement("canvas"),
context = canvas.getContext("2d");
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0);
return context.getImageData(0, 0, image.width, image.height);
},
jpeg2_copyPixelsToForm32: function(image, formBits) {
var pixels = image.data;
for (var i = 0; i < formBits.length; i++) {
var r = pixels[i*4 + 0],
g = pixels[i*4 + 1],
b = pixels[i*4 + 2];
formBits[i] = 0xFF000000 | (r << 16) | (g << 8) | b;
}
},
jpeg2_copyPixelsToForm16: function(image, formBits) {
var width = image.width,
height = image.height,
pixels = image.data;
for (var y = 0; y < height; y++)
for (var x = 0; x < width; x += 2) {
var i = y * height + x,
r1 = pixels[i*4 + 0] >> 3,
g1 = pixels[i*4 + 1] >> 3,
b1 = pixels[i*4 + 2] >> 3,
r2 = pixels[i*4 + 4] >> 3,
g2 = pixels[i*4 + 5] >> 3,
b2 = pixels[i*4 + 6] >> 3,
formPix = (r1 << 10) | (g1 << 5) | b1;
if (formPix === 0) formPix = 1;
formPix = (formPix << 16) | (r2 << 10) | (g2 << 5) | b2;
if ((formPix & 65535) === 0) formPix = formPix | 1;
formBits[i >> 1] = formPix;
}
},
jpeg2_ditherPixelsToForm16: function(image, formBits) {
var width = image.width >> 1, // 2 pix a time
height = image.height,
pixels = image.data,
ditherMatrix1 = [2, 0, 14, 12, 1, 3, 13, 15],
ditherMatrix2 = [10, 8, 6, 4, 9, 11, 5, 7];
for (var y = 0; y < height; y++)
for (var x = 0; x < width; x++) {
var i = (y * height + 2 * x) << 2,
r1 = pixels[i + 0],
g1 = pixels[i + 1],
b1 = pixels[i + 2],
r2 = pixels[i + 4],
g2 = pixels[i + 5],
b2 = pixels[i + 6];
/* Do 4x4 ordered dithering. Taken from Form>>orderedDither32To16 */
var v = ((y & 3) << 1) | (x & 1),
dmv1 = ditherMatrix1[v],
dmv2 = ditherMatrix2[v],
di, dmi, dmo;
di = (r1 * 496) >> 8, dmi = di & 15, dmo = di >> 4;
if (dmv1 < dmi) { r1 = dmo+1; } else { r1 = dmo; };
di = (g1 * 496) >> 8; dmi = di & 15; dmo = di >> 4;
if (dmv1 < dmi) { g1 = dmo+1; } else { g1 = dmo; };
di = (b1 * 496) >> 8; dmi = di & 15; dmo = di >> 4;
if (dmv1 < dmi) { b1 = dmo+1; } else { b1 = dmo; };
di = (r2 * 496) >> 8; dmi = di & 15; dmo = di >> 4;
if (dmv2 < dmi) { r2 = dmo+1; } else { r2 = dmo; };
di = (g2 * 496) >> 8; dmi = di & 15; dmo = di >> 4;
if (dmv2 < dmi) { g2 = dmo+1; } else { g2 = dmo; };
di = (b2 * 496) >> 8; dmi = di & 15; dmo = di >> 4;
if (dmv2 < dmi) { b2 = dmo+1; } else { b2 = dmo; };
var formPix = (r1 << 10) | (g1 << 5) | b1;
if (formPix === 0) formPix = 1;
formPix = (formPix << 16) | (r2 << 10) | (g2 << 5) | b2;
if ((formPix & 65535) === 0) formPix = formPix | 1;
formBits[i >> 3] = formPix;
}
},
});