Question about FaceMakeupFilter landmarks about gpupixel

[jaaronkot]

In the future, I will write a dedicated series of articles explaining the principles of the SDK. However, my resources are limited, so please be patient and wait for it. Thank you.

[dsxlong]

@leon4app 你好，有研究出TextureBounds的原理吗？
auto mouth = SourceImage::create("mouth.png");
lipstick_filter_ = FaceMakeupFilter::create();
lipstick_filter_->setImageTexture(mouth);
lipstick_filter_->setTextureBounds(FrameBounds{502.5, 710, 262.5, 167.5});

auto blusher = SourceImage::create("blusher.png");
blusher_filter_ = FaceMakeupFilter::create();
blusher_filter_->setImageTexture(blusher);
blusher_filter_->setTextureBounds(FrameBounds{395, 520, 489, 209});

[jaaronkot]

TextureBounds FrameBounds{502.5, 710, 262.5, 167.5}和FrameBounds{395, 520, 489, 209} 这两组值是固定的，是嘴巴和腮部在人脸上的位置和区域。是因为计算的坐标是按照一张固定的标准人脸或者说平均人脸来确定的，标准人脸图可以由设计师来创建，确定人脸上各个点的坐标。然后转换为纹理采样的坐标，范围在[0, 1] 之间。

[WoYang]

TextureBounds FrameBounds{502.5, 710, 262.5, 167.5}和FrameBounds{395, 520, 489, 209} 这两组值是固定的，是嘴巴和腮部在人脸上的位置和区域。是因为计算的坐标是按照一张固定的标准人脸或者说平均人脸来确定的，标准人脸图可以由设计师来创建，确定人脸上各个点的坐标。然后转换为纹理采样的坐标，范围在[0, 1] 之间。

@gezhaoyou Hi，这里把纹理坐标重新进行了计算对齐到顶点坐标，这个转换原理没有看懂，原理是什么呀？
for (int i = 0; i < point_count; i++) {
textureCoordinates[i * 2 + 0] =(coord[i * 2 + 0] * 1280 - texture_bounds_.x) / texture_bounds_.width;
textureCoordinates[i * 2 + 1] =(coord[i * 2 + 1] * 1280 - texture_bounds_.y) / texture_bounds_.height;
}