Merge pull request 'fix: 透明底正常生成；静动图分离完成' (#18) from tnot/konabot:fix--修复部分Bug into master

Reviewed-on: #18

konabot/plugins/ytpgif/__init__.py

@@ -0,0 +1,268 @@
+import os
+import tempfile
+from typing import Optional
+
+from PIL import Image, ImageSequence
+from nonebot.adapters import Event as BaseEvent
+from nonebot.plugin import PluginMetadata
+from nonebot_plugin_alconna import (
+    Alconna,
+    Args,
+    Field,
+    UniMessage,
+    on_alconna,
+)
+
+__plugin_meta__ = PluginMetadata(
+    name="ytpgif",
+    description="生成来回镜像翻转的仿 YTPMV 动图。",
+    usage="ytpgif [倍速=1.0] （倍速范围：0.1～20.0）",
+    type="application",
+    config=None,
+    homepage=None,
+)
+
+# 参数定义
+BASE_SEGMENT_DURATION = 0.25
+BASE_INTERVAL = 0.25
+MAX_SIZE = 256
+MIN_SPEED = 0.1
+MAX_SPEED = 20.0
+MAX_FRAMES_PER_SEGMENT = 500
+
+# 提示语
+SPEED_TIPS = f"倍速必须是 {MIN_SPEED} 到 {MAX_SPEED} 之间的数字"
+
+
+# 定义命令 + 参数校验
+ytpgif_cmd = on_alconna(
+    Alconna(
+        "ytpgif",
+        Args[
+            "speed?",
+            float,
+            Field(
+                default=1.0,
+                unmatch_tips=lambda x: f"“{x}”不是有效数值。{SPEED_TIPS}",
+            ),
+        ],
+    ),
+    use_cmd_start=True,
+    use_cmd_sep=False,
+    skip_for_unmatch=False,
+)
+
+
+async def get_image_url(event: BaseEvent) -> Optional[str]:
+    """从事件中提取图片 URL，支持直接消息和回复"""
+    msg = event.get_message()
+    for seg in msg:
+        if seg.type == "image" and seg.data.get("url"):
+            return str(seg.data["url"])
+
+    if hasattr(event, "reply") and (reply := event.reply):
+        reply_msg = reply.message
+        for seg in reply_msg:
+            if seg.type == "image" and seg.data.get("url"):
+                return str(seg.data["url"])
+    return None
+
+
+async def download_image(url: str) -> bytes:
+    import httpx
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(url, timeout=10)
+        resp.raise_for_status()
+        return resp.content
+
+
+def resize_frame(frame: Image.Image) -> Image.Image:
+    """缩放图像，保持宽高比，不超过 MAX_SIZE"""
+    w, h = frame.size
+    if w <= MAX_SIZE and h <= MAX_SIZE:
+        return frame
+
+    scale = MAX_SIZE / max(w, h)
+    new_w = int(w * scale)
+    new_h = int(h * scale)
+    return frame.resize((new_w, new_h), Image.Resampling.LANCZOS)
+
+
+@ytpgif_cmd.handle()
+async def handle_ytpgif(event: BaseEvent, speed: float = 1.0):
+    # === 校验 speed 范围 ===
+    if not (MIN_SPEED <= speed <= MAX_SPEED):
+        await ytpgif_cmd.send(
+            await UniMessage.text(f"❌ {SPEED_TIPS}").export()
+        )
+        return
+
+    img_url = await get_image_url(event)
+    if not img_url:
+        await ytpgif_cmd.send(
+            await UniMessage.text(
+                "请发送一张图片或回复一张图片来生成镜像动图。"
+            ).export()
+        )
+        return
+
+    try:
+        image_data = await download_image(img_url)
+    except Exception as e:
+        print(f"[YTPGIF] 下载失败: {e}")
+        await ytpgif_cmd.send(
+            await UniMessage.text("❌ 图片下载失败，请重试。").export()
+        )
+        return
+
+    input_path = output_path = None
+    try:
+        with tempfile.NamedTemporaryFile(delete=False, suffix=".gif") as tmp_in:
+            tmp_in.write(image_data)
+            input_path = tmp_in.name
+
+        with tempfile.NamedTemporaryFile(delete=False, suffix=".gif") as tmp_out:
+            output_path = tmp_out.name
+
+        with Image.open(input_path) as src_img:
+            # === 判断是否为动图 ===
+            try:
+                n_frames = getattr(src_img, "n_frames", 1)
+                is_animated = n_frames > 1
+            except Exception:
+                is_animated = False
+
+            output_frames = []
+            output_durations_ms = []
+
+            if is_animated:
+                # === 动图模式：截取正向 + 镜像两段 ===
+                frames_with_duration = []
+                palette = src_img.getpalette()
+
+                for idx in range(n_frames):
+                    src_img.seek(idx)
+                    frame = src_img.copy()
+                    # 检查是否需要透明通道
+                    has_alpha = (
+                        frame.mode in ("RGBA", "LA")
+                        or (frame.mode == "P" and "transparency" in frame.info)
+                    )
+                    if has_alpha:
+                        frame = frame.convert("RGBA")
+                    else:
+                        frame = frame.convert("RGB")
+                    resized_frame = resize_frame(frame)
+
+                    # 若原图有调色板，尝试保留（可选）
+                    if palette and resized_frame.mode == "P":
+                        try:
+                            resized_frame.putpalette(palette)
+                        except Exception:  # noqa
+                            pass
+
+                    ms = frame.info.get("duration", int(BASE_SEGMENT_DURATION * 1000))
+                    dur_sec = max(0.01, ms / 1000.0)
+                    frames_with_duration.append((resized_frame, dur_sec))
+
+                max_dur = BASE_SEGMENT_DURATION * speed
+                accumulated = 0.0
+                frame_count = 0
+
+                # 正向段
+                for img, dur in frames_with_duration:
+                    if accumulated + dur > max_dur or frame_count >= MAX_FRAMES_PER_SEGMENT:
+                        break
+                    output_frames.append(img)
+                    output_durations_ms.append(int(dur * 1000))
+                    accumulated += dur
+                    frame_count += 1
+
+                if frame_count == 0:
+                    await ytpgif_cmd.send(
+                        await UniMessage.text("动图帧太短，无法生成有效片段。").export()
+                    )
+                    return
+
+                # 镜像段（从头开始）
+                accumulated = 0.0
+                frame_count = 0
+                for img, dur in frames_with_duration:
+                    if accumulated + dur > max_dur or frame_count >= MAX_FRAMES_PER_SEGMENT:
+                        break
+                    flipped = img.transpose(Image.FLIP_LEFT_RIGHT)
+                    output_frames.append(flipped)
+                    output_durations_ms.append(int(dur * 1000))
+                    accumulated += dur
+                    frame_count += 1
+
+            else:
+                # === 静态图模式：制作翻转动画 ===
+                raw_frame = src_img.convert("RGBA")
+                resized_frame = resize_frame(raw_frame)
+
+                interval_sec = max(0.025, min(2.5, BASE_INTERVAL / speed))
+                duration_ms = int(interval_sec * 1000)
+
+                frame1 = resized_frame
+                frame2 = resized_frame.transpose(Image.FLIP_LEFT_RIGHT)
+
+                output_frames = [frame1, frame2]
+                output_durations_ms = [duration_ms, duration_ms]
+
+            if len(output_frames) < 1:
+                await ytpgif_cmd.send(
+                    await UniMessage.text("未能生成任何帧。").export()
+                )
+                return
+
+            # === 🔐 关键修复：防止无透明图的颜色被当成透明 ===
+            need_transparency = False
+            for frame in output_frames:
+                if frame.mode == "RGBA":
+                    alpha_channel = frame.getchannel("A")
+                    if any(pix < 255 for pix in alpha_channel.getdata()):
+                        need_transparency = True
+                        break
+                elif frame.mode == "P" and "transparency" in frame.info:
+                    need_transparency = True
+                    break
+
+            # 如果不需要透明，则统一转为 RGB 避免调色板污染
+            if not need_transparency:
+                output_frames = [f.convert("RGB") for f in output_frames]
+
+            # 构建保存参数
+            save_kwargs = {
+                "save_all": True,
+                "append_images": output_frames[1:],
+                "format": "GIF",
+                "loop": 0,           # 无限循环
+                "duration": output_durations_ms,
+                "disposal": 2,       # 清除到背景色，避免残留
+                "optimize": False,   # 关闭抖动（等效 -dither none）
+            }
+
+            # 只有真正需要透明时才启用 transparency
+            if need_transparency:
+                save_kwargs["transparency"] = 0
+
+            output_frames[0].save(output_path, **save_kwargs)
+
+        # 发送结果
+        with open(output_path, "rb") as f:
+            result_image = UniMessage.image(raw=f.read())
+        await ytpgif_cmd.send(await result_image.export())
+
+    except Exception as e:
+        print(f"[YTPGIF] 处理失败: {e}")
+        await ytpgif_cmd.send(
+            await UniMessage.text("❌ 处理失败，可能是图片格式不支持、文件损坏或过大。").export()
+        )
+    finally:
+        for path in filter(None, [input_path, output_path]):
+            if os.path.exists(path):
+                try:
+                    os.unlink(path)
+                except:  # noqa
+                    pass