199 lines
7.1 KiB
JavaScript
199 lines
7.1 KiB
JavaScript
'use strict';
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// The official spine-canvas SkeletonRenderer does not process clipping
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// attachments. Keep its triangle rasterizer, but feed it geometry produced by
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// SkeletonClipping so the viewer matches Spine's draw order and clipping rules.
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const QUAD_TRIANGLES = [0, 1, 2, 2, 3, 0];
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const unpremultipliedImages = new WeakMap();
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function rendererConstructor(spine) {
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return (spine.canvas && spine.canvas.SkeletonRenderer) || spine.SkeletonRenderer;
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}
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function imageFromAttachment(attachment) {
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const region = attachment && attachment.region;
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// 4.0 stores the texture on the atlas page, while the other bundled
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// runtimes expose it directly on the attachment region.
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const renderRegion = region && region.renderObject;
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const texture = region && (region.texture
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|| (region.page && region.page.texture)
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|| (renderRegion && renderRegion.texture)
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|| (renderRegion && renderRegion.page && renderRegion.page.texture));
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return texture && typeof texture.getImage === 'function' ? texture.getImage() : null;
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}
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// Canvas 2D always applies source-alpha blending. A Spine texture exported
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// with PMA already has RGB multiplied by alpha, so drawing it directly would
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// multiply translucent edge pixels a second time. Convert it once to straight
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// alpha and cache the result; Canvas can then blend it correctly.
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function imageForCanvas(image, context, premultipliedAlpha) {
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if (!premultipliedAlpha || !image || (typeof image !== 'object' && typeof image !== 'function')) return image;
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const cached = unpremultipliedImages.get(image);
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if (cached) return cached;
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try {
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const ownerDocument = context.canvas && context.canvas.ownerDocument;
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const doc = ownerDocument || (typeof document !== 'undefined' ? document : null);
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if (!doc || !image.width || !image.height) return image;
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const canvas = doc.createElement('canvas');
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canvas.width = image.width;
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canvas.height = image.height;
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const ctx = canvas.getContext('2d', { willReadFrequently: true });
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ctx.drawImage(image, 0, 0);
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const pixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
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const data = pixels.data;
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for (let i = 0; i < data.length; i += 4) {
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const alpha = data[i + 3];
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if (alpha > 0 && alpha < 255) {
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const factor = 255 / alpha;
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data[i] = Math.min(255, Math.round(data[i] * factor));
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data[i + 1] = Math.min(255, Math.round(data[i + 1] * factor));
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data[i + 2] = Math.min(255, Math.round(data[i + 2] * factor));
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}
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}
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ctx.putImageData(pixels, 0, 0);
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unpremultipliedImages.set(image, canvas);
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return canvas;
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} catch (e) {
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// If pixel access is unavailable, retain the original texture so preview
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// remains usable instead of failing the whole frame.
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return image;
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}
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}
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function unpackVertices(vertices, count) {
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const positions = new Array(count * 2);
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const uvs = new Array(count * 2);
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for (let i = 0, p = 0; i < count; i++, p += 2) {
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const source = i * 8;
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positions[p] = vertices[source];
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positions[p + 1] = vertices[source + 1];
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uvs[p] = vertices[source + 6];
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uvs[p + 1] = vertices[source + 7];
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}
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return { positions, uvs };
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}
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function drawInterleaved(base, image, vertices, triangles) {
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for (let i = 0; i < triangles.length; i += 3) {
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const a = triangles[i] * 8;
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const b = triangles[i + 1] * 8;
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const c = triangles[i + 2] * 8;
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base.drawTriangle(image,
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vertices[a], vertices[a + 1], vertices[a + 6], vertices[a + 7],
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vertices[b], vertices[b + 1], vertices[b + 6], vertices[b + 7],
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vertices[c], vertices[c + 1], vertices[c + 6], vertices[c + 7]);
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}
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}
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function createLegacyRenderer(spine, context) {
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const Renderer = rendererConstructor(spine);
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if (!Renderer || !spine.SkeletonClipping) throw new Error('Spine Canvas 渲染器不完整');
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const base = new Renderer(context);
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base.triangleRendering = true;
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base.premultipliedAlpha = false;
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const clipper = new spine.SkeletonClipping();
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const dark = new spine.Color(0, 0, 0, 0);
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base.draw = function drawWithClipping(skeleton) {
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const drawOrder = skeleton.drawOrder;
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const pma = !!base.premultipliedAlpha;
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try {
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for (let i = 0; i < drawOrder.length; i++) {
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const slot = drawOrder[i];
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if (slot.bone && slot.bone.active === false) {
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clipper.clipEndWithSlot(slot);
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continue;
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}
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const attachment = slot.getAttachment();
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if (attachment instanceof spine.ClippingAttachment) {
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clipper.clipStart(slot, attachment);
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continue;
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}
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try {
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if (!attachment) continue;
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let vertices;
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let triangles;
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let vertexCount;
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if (attachment instanceof spine.RegionAttachment) {
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vertices = base.computeRegionVertices(slot, attachment, pma);
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triangles = Renderer.QUAD_TRIANGLES || QUAD_TRIANGLES;
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vertexCount = 4;
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} else if (attachment instanceof spine.MeshAttachment) {
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vertices = base.computeMeshVertices(slot, attachment, pma);
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triangles = attachment.triangles;
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vertexCount = attachment.worldVerticesLength >> 1;
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} else {
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continue;
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}
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const image = imageForCanvas(imageFromAttachment(attachment), context, pma);
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if (!image) continue;
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context.globalAlpha = base.tempColor.a;
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if (clipper.isClipping()) {
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const unpacked = unpackVertices(vertices, vertexCount);
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clipper.clipTriangles(unpacked.positions, unpacked.positions.length,
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triangles, triangles.length, unpacked.uvs, base.tempColor, dark, false);
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drawInterleaved(base, image, clipper.clippedVertices, clipper.clippedTriangles);
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} else {
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drawInterleaved(base, image, vertices, triangles);
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}
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} finally {
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clipper.clipEndWithSlot(slot);
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}
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}
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} finally {
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clipper.clipEnd();
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context.globalAlpha = 1;
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}
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};
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base.clipper = clipper;
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return base;
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}
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function create43Renderer(spine, context) {
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const Renderer = rendererConstructor(spine);
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if (!Renderer || !spine.SkeletonRendererCore) throw new Error('Spine 4.3 Canvas 渲染器不完整');
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const base = new Renderer(context);
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base.triangleRendering = true;
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base.premultipliedAlpha = false;
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const core = new spine.SkeletonRendererCore();
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base.draw = function drawWithCoreClipping(skeleton) {
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try {
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const pma = !!base.premultipliedAlpha;
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for (let command = core.render(skeleton, pma); command; command = command.next) {
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const sourceImage = command.texture && command.texture.getImage && command.texture.getImage();
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const image = imageForCanvas(sourceImage, context, pma);
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if (!image) continue;
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context.globalAlpha = ((command.colors[0] >>> 24) & 255) / 255;
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const positions = command.positions;
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const uvs = command.uvs;
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const indices = command.indices;
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for (let i = 0; i < command.numIndices; i += 3) {
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const a = indices[i] * 2;
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const b = indices[i + 1] * 2;
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const c = indices[i + 2] * 2;
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base.drawTriangle(image,
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positions[a], positions[a + 1], uvs[a], uvs[a + 1],
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positions[b], positions[b + 1], uvs[b], uvs[b + 1],
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positions[c], positions[c + 1], uvs[c], uvs[c + 1]);
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}
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}
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} finally {
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context.globalAlpha = 1;
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}
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};
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base.clipper = core.clipping;
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return base;
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}
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function createRenderer(spine, context, runtimeDir) {
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return runtimeDir === '4.3'
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? create43Renderer(spine, context)
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: createLegacyRenderer(spine, context);
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}
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module.exports = { createRenderer };
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