167 lines
7.9 KiB
TypeScript
167 lines
7.9 KiB
TypeScript
type LayoutReplaceModelDescriptor = {
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capabilities?: unknown;
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displayName?: string | null;
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healthStatus?: string | null;
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id: string;
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imageGenConfig?: unknown;
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isDefault?: boolean | null;
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isSubModel?: boolean | null;
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modelId?: string | null;
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supportsImageGen?: boolean | null;
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supportsVision?: boolean | null;
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};
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type LayoutReplaceProviderDescriptor = {
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type?: string | null;
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};
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export type CanvasLayoutReplaceModelCandidate = {
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model: LayoutReplaceModelDescriptor;
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provider: LayoutReplaceProviderDescriptor;
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};
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const MODEL_PREFERENCE_PATTERNS: RegExp[] = [
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/^snapgen\/gpt-image-2$/i,
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/^gpt-image-2(?:-vip)?$/i,
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/^openai\/gpt-image-2-developer\/edit$/i,
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/^openai\/gpt-image-2\/edit$/i,
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/^bytedance\/seedream-v5(?:\.0)?-pro\/edit$/i,
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/^qwen\/qwen-image-2(?:\.0)?-pro\/edit$/i,
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/gpt-image.*\/edit/i,
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/seedream.*\/edit/i,
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/qwen-image.*\/edit/i,
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/(?:^|[\s/_-])edit(?:$|[\s/_-])/i,
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];
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const PROVIDER_PREFERENCE = new Map([
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["vip98k", 30],
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["atlascloud", 25],
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["openai-image", 20],
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["volcano-vision", 15],
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["snapgen-image", 10],
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]);
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function readPositiveNumber(source: unknown, keys: string[]) {
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if (!source || typeof source !== "object") return null;
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const record = source as Record<string, unknown>;
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for (const key of keys) {
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const parsed = Number(record[key]);
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if (Number.isFinite(parsed) && parsed > 0) return parsed;
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}
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return null;
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}
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function getConfiguredReferenceImageLimit(model: LayoutReplaceModelDescriptor) {
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return (
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readPositiveNumber(model.imageGenConfig, [
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"maxReferenceImages",
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"maxInputImages",
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]) ||
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readPositiveNumber(model.capabilities, [
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"maxReferenceImages",
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"maxInputImages",
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])
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);
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}
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function getModelDescriptor(candidate: CanvasLayoutReplaceModelCandidate) {
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return JSON.stringify([
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candidate.model.modelId,
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candidate.model.displayName,
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candidate.model.capabilities,
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candidate.model.imageGenConfig,
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]).toLowerCase();
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}
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export function isCanvasLayoutReplaceModelEligible(
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candidate: CanvasLayoutReplaceModelCandidate,
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) {
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if (String(candidate.provider.type || "").trim() === "fal-image") return false;
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if (!candidate.model.supportsImageGen || candidate.model.isSubModel) return false;
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if (candidate.model.supportsVision === false) return false;
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if (candidate.model.healthStatus === "auto_disabled") return false;
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const referenceImageLimit = getConfiguredReferenceImageLimit(candidate.model);
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// supportsVision alone does not mean that the image-generation invocation
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// accepts two inputs. Unknown/single-image limits cannot preserve both roles.
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return referenceImageLimit !== null && referenceImageLimit >= 2;
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}
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function getCanvasLayoutReplaceModelScore(
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candidate: CanvasLayoutReplaceModelCandidate,
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) {
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const modelId = String(candidate.model.modelId || "").trim();
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const descriptor = getModelDescriptor(candidate);
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const preferenceIndex = MODEL_PREFERENCE_PATTERNS.findIndex(
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(pattern) => pattern.test(modelId) || pattern.test(descriptor),
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);
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const modelScore =
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preferenceIndex >= 0 ? (MODEL_PREFERENCE_PATTERNS.length - preferenceIndex) * 100 : 0;
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// A preferred model alias on a degraded account must not outrank a healthy
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// multi-image editor (e.g. an otherwise preferred but depleted reseller).
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const healthScore = candidate.model.healthStatus === "healthy" ? 2000 : 0;
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const providerScore =
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PROVIDER_PREFERENCE.get(candidate.provider.type || "") || 0;
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const defaultScore = candidate.model.isDefault ? 5 : 0;
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return modelScore + healthScore + providerScore + defaultScore;
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}
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export function rankCanvasLayoutReplaceModels(
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models: CanvasLayoutReplaceModelCandidate[],
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requestedModel?: string | null,
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) {
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const eligible = models.filter(isCanvasLayoutReplaceModelEligible);
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const requested = String(requestedModel || "").trim();
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return eligible.sort((left, right) => {
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if (requested && requested !== "auto") {
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const leftRequested =
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left.model.id === requested || left.model.modelId === requested;
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const rightRequested =
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right.model.id === requested || right.model.modelId === requested;
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if (leftRequested !== rightRequested) return leftRequested ? -1 : 1;
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}
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const scoreDifference =
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getCanvasLayoutReplaceModelScore(right) -
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getCanvasLayoutReplaceModelScore(left);
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if (scoreDifference !== 0) return scoreDifference;
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return left.model.id.localeCompare(right.model.id);
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});
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}
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export function buildCanvasLayoutReplacePrompt(params: {
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referenceHeight?: number;
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referenceWidth?: number;
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sourceProductAspectRatio?: number;
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sourceProductIdentity?: string;
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supplementalPrompt?: string;
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}) {
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const geometry =
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params.referenceWidth && params.referenceHeight
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? `${params.referenceWidth}x${params.referenceHeight}`
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: "与图1完全相同";
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const supplement = String(params.supplementalPrompt || "").trim();
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const sourceProductAspectRatio =
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Number.isFinite(params.sourceProductAspectRatio) &&
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Number(params.sourceProductAspectRatio) > 0
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? Number(params.sourceProductAspectRatio)
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: null;
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const sourceProductRatioConstraint = sourceProductAspectRatio
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? `【新商品轮廓】图2透明前景测得的商品外框宽高比约为 ${sourceProductAspectRatio.toFixed(3)}:1，只允许整体等比缩放与平移，不得改变各部件的比例。`
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: "";
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return [
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"执行商品模版替换，最终只输出一张完整成图。",
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"【图片角色与方向】图1是目标模版底图，是最终场景、版式、文字和构图的唯一依据。图2是新商品身份图，只提供需要放入模版的新商品。必须在图1中换入图2商品，绝对不能把图1的旧商品搬入图2的背景。",
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"【编辑底图】以图1作为实际编辑底图，识别并移除图1的旧商品，在对应位置放入图2的新商品；不使用图2的背景、房间、墙面、地面、装饰、文字或水印。图2即使是有背景的实拍图，也必须结合图1旧商品的类别，定位图2对应的新商品主体，不能把源图整个场景或无关物件当成新商品。",
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"【商品身份】忠实保留图2商品的外形、颜色、材质、部件数量、分区和相对比例，不得把图1旧商品的款式、配色或结构混入新商品。按实际图片识别商品，不能凭空增加抽屉、门、腿或其他零件。商品完整出现一次，不裁切、不拼接、不复制。",
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sourceProductRatioConstraint,
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params.sourceProductIdentity ? `【新商品结构核对线索】${params.sourceProductIdentity.slice(0, 600)}。这是对图2的辅助识别，不是额外的改款要求；任何描述或数量与图2冲突时，始终以图2原图为准，不得按描述重做商品。不能继承图1的腿、底座、抽屉或其他部件；图2无腿脚时绝不能新增腿脚，保留原有贴地或悬挂方式。` : "",
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"【模版版式和原有文字】保留图1原有标题、品牌、价格、标签、卖点、图标和其他可见文案，以及它们的内容、字体风格、位置和层级。只替换商品；不能把电商海报变成无字场景照片。图1没有文字时不新增文字。模版中其他独立物件和背景保留原有位置及遮挡关系。",
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`【画布与融合】输出画布为 ${geometry}，宽高比和图1一致。将新商品整体等比缩放、放置在模版中合理的商品位置，保持真实结构；只调整必要的接触阴影、环境色和光照以融入图1，不重构整个场景。`,
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supplement ? `【用户补充】${supplement}。补充仅约束商品替换细节，不改变两张图的职责、商品身份或模版版式。` : "",
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"【输出前检查】确认输出沿用了图1的模版，而商品确实来自图2；检查商品配色、结构和部件，检查原有文案与布局是否保留。只输出最终成图，不输出并排对比、拼图、多方案、说明文字、新增边框或水印。",
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].filter(Boolean).join("\n\n");
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}
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