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libbpg-0.9.5

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King_DuckZ 2015-01-16 13:48:11 +01:00
parent 6e56352f86
commit 357f186837
35 changed files with 3022 additions and 2134 deletions
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90
post.js
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@ -25,6 +25,8 @@ window['BPGDecoder'] = function(ctx) {
this.ctx = ctx;
this['imageData'] = null;
this['onload'] = null;
this['frames'] = null;
this['loop_count'] = 0;
}
window['BPGDecoder'].prototype = {
@ -41,6 +43,8 @@ bpg_decoder_get_info: Module['cwrap']('bpg_decoder_get_info', 'number', [ 'numbe
bpg_decoder_start: Module['cwrap']('bpg_decoder_start', 'number', [ 'number', 'number' ]),
bpg_decoder_get_frame_duration: Module['cwrap']('bpg_decoder_get_frame_duration', 'void', [ 'number', 'number', 'number' ]),
bpg_decoder_get_line: Module['cwrap']('bpg_decoder_get_line', 'number', [ 'number', 'number' ]),
bpg_decoder_close: Module['cwrap']('bpg_decoder_close', 'void', [ 'number' ] ),
@ -62,8 +66,8 @@ _onload: function(request, event)
{
var data = request.response;
var array = new Uint8Array(data);
var img, w, h, img_info_buf, cimg, p0, rgba_line, w4;
var heap8, heap32, dst, v, i, y, func;
var img, w, h, img_info_buf, cimg, p0, rgba_line, w4, frame_count;
var heap8, heap16, heap32, dst, v, i, y, func, duration, frames, loop_count;
// console.log("loaded " + data.byteLength + " bytes");
@ -74,39 +78,52 @@ _onload: function(request, event)
return;
}
img_info_buf = this.malloc(9 * 4);
img_info_buf = this.malloc(5 * 4);
this.bpg_decoder_get_info(img, img_info_buf);
/* extract the image info */
heap8 = Module['HEAPU8'];
heap16 = Module['HEAPU16'];
heap32 = Module['HEAPU32'];
w = heap32[img_info_buf >> 2];
h = heap32[(img_info_buf + 4) >> 2];
this.free(img_info_buf);
// console.log("image " + w + " " + h);
loop_count = heap16[(img_info_buf + 16) >> 1];
// console.log("image: w=" + w + " h=" + h + " loop_count=" + loop_count);
/* select RGBA32 output */
this.bpg_decoder_start(img, 1);
rgba_line = this.malloc(w * 4);
cimg = this.ctx.createImageData(w, h);
dst = cimg.data;
p0 = 0;
heap8 = Module['HEAPU8'];
w4 = w * 4;
for(y = 0; y < h; y++) {
this.bpg_decoder_get_line(img, rgba_line);
for(i = 0; i < w4; i = (i + 1) | 0) {
dst[p0] = heap8[(rgba_line + i) | 0] | 0;
p0 = (p0 + 1) | 0;
rgba_line = this.malloc(w4);
frame_count = 0;
frames = [];
for(;;) {
/* select RGBA32 output */
if (this.bpg_decoder_start(img, 1) < 0)
break;
this.bpg_decoder_get_frame_duration(img, img_info_buf,
img_info_buf + 4);
duration = (heap32[img_info_buf >> 2] * 1000) / heap32[(img_info_buf + 4) >> 2];
cimg = this.ctx.createImageData(w, h);
dst = cimg.data;
p0 = 0;
for(y = 0; y < h; y++) {
this.bpg_decoder_get_line(img, rgba_line);
for(i = 0; i < w4; i = (i + 1) | 0) {
dst[p0] = heap8[(rgba_line + i) | 0] | 0;
p0 = (p0 + 1) | 0;
}
}
frames[frame_count++] = { 'img': cimg, 'duration': duration };
}
this.free(rgba_line);
this.free(img_info_buf);
this.bpg_decoder_close(img);
this['imageData'] = cimg;
this['loop_count'] = loop_count;
this['frames'] = frames;
this['imageData'] = frames[0]['img'];
if (this['onload'])
this['onload']();
}
@ -155,13 +172,42 @@ window.onload = function() {
ctx = canvas.getContext("2d");
dec = new BPGDecoder(ctx);
dec.onload = (function(canvas, ctx) {
var imageData = this['imageData'];
var dec = this;
var frames = this['frames'];
var imageData = frames[0]['img'];
function next_frame() {
var frame_index = dec.frame_index;
/* compute next frame index */
if (++frame_index >= frames.length) {
if (dec['loop_count'] == 0 ||
dec.loop_counter < dec['loop_count']) {
frame_index = 0;
dec.loop_counter++;
} else {
frame_index = -1;
}
}
if (frame_index >= 0) {
dec.frame_index = frame_index;
ctx.putImageData(frames[frame_index]['img'], 0, 0);
setTimeout(next_frame, frames[frame_index]['duration']);
}
};
/* resize the canvas to the image size */
canvas.width = imageData.width;
canvas.height = imageData.height;
/* draw the image */
ctx.putImageData(imageData, 0, 0);
/* if it is an animation, add a timer to display the next frame */
if (frames.length > 1) {
dec.frame_index = 0;
dec.loop_counter = 0;
setTimeout(next_frame, frames[0]['duration']);
}
}).bind(dec, canvas, ctx);
dec.load(url);
}