cassdlcm/mediapipe
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Internal change

Browse Source 
PiperOrigin-RevId: 514452059
This commit is contained in:
MediaPipe Team 2023-03-06 10:27:47 -08:00 committed by Copybara-Service
parent 6c68d4c358
commit c64f83fff4
1 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
mediapipe/calculators/image/set_alpha_calculator.cc
View File

@ -47,10 +47,11 @@ constexpr int kNumChannelsRGBA = 4;
enum { ATTRIB_VERTEX, ATTRIB_TEXTURE_POSITION, NUM_ATTRIBUTES };
// Combines an RGB cv::Mat and a single-channel alpha cv::Mat of the same
// dimensions into an RGBA cv::Mat. Alpha may be read as uint8 or as another
// numeric type; in the latter case, it is upscaled to values between 0 and 255
// from an assumed input range of [0, 1). RGB and RGBA Mat's must be uchar.
// Combines an RGB cv::Mat and an alpha cv::Mat of the same dimensions into an
// RGBA cv::Mat. Alpha may be read as uint8 or as another numeric type; in the
// latter case, it is upscaled to values between 0 and 255 from an assumed input
// range of [0, 1). Only the first channel of Alpha is used. Input & output Mat
// must be uchar.
template <typename AlphaType>
absl::Status MergeRGBA8Image(const cv::Mat input_mat, const cv::Mat& alpha_mat,
cv::Mat& output_mat) {
@ -71,9 +72,9 @@ absl::Status MergeRGBA8Image(const cv::Mat input_mat, const cv::Mat& alpha_mat,
out_ptr[out_idx + 1] = in_ptr[in_idx + 1];
out_ptr[out_idx + 2] = in_ptr[in_idx + 2];
if constexpr (std::is_same<AlphaType, uchar>::value) {
out_ptr[out_idx + 3] = alpha_ptr[alpha_idx + 0];
out_ptr[out_idx + 3] = alpha_ptr[alpha_idx + 0]; // channel 0 of mask
} else {
const AlphaType alpha = alpha_ptr[alpha_idx + 0];
const AlphaType alpha = alpha_ptr[alpha_idx + 0]; // channel 0 of mask
out_ptr[out_idx + 3] = static_cast<uchar>(round(alpha * 255.0f));
}
}
@ -291,8 +292,8 @@ absl::Status SetAlphaCalculator::RenderCpu(CalculatorContext* cc) {
const auto& alpha_mask = cc->Inputs().Tag(kInputAlphaTag).Get<ImageFrame>();
cv::Mat alpha_mat = mediapipe::formats::MatView(&alpha_mask);
const bool alpha_is_float = alpha_mat.type() == CV_32FC1;
RET_CHECK(alpha_is_float || alpha_mat.type() == CV_8UC1);
const bool alpha_is_float = CV_MAT_DEPTH(alpha_mat.type()) == CV_32F;
RET_CHECK(alpha_is_float || CV_MAT_DEPTH(alpha_mat.type()) == CV_8U);
if (alpha_is_float) {
MP_RETURN_IF_ERROR(