stephenseo/EN605.617.81.FA21_StephenSeo_DitheringProject
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Minor fix regarding blue-noise-offsets

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This commit is contained in:
Stephen Seo 2021-12-01 18:13:21 +09:00
parent 6e27c41f43
commit de1b0cc2ac
1 changed files with 8 additions and 7 deletions
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15
src/image.cc
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@ -50,6 +50,7 @@ Image::Image()
is_dithered_grayscale_(false),
is_dithered_color_(false),
is_preserving_blue_noise_offsets_(true) {
std::srand(std::time(nullptr));
GenerateBlueNoiseOffsets();
}
@ -91,6 +92,7 @@ Image::Image(const std::string &filename)
return;
}
std::srand(std::time(nullptr));
GenerateBlueNoiseOffsets();
}
@ -696,10 +698,6 @@ std::unique_ptr<Image> Image::ToColorDitheredWithBlueNoise(Image *blue_noise) {
if (!opencl_handle->HasBuffer(color_kernel_name,
kBufferBlueNoiseOffsetsName)) {
if (!is_preserving_blue_noise_offsets_) {
GenerateBlueNoiseOffsets();
}
if (!opencl_handle->CreateKernelBuffer(
color_kernel_name, CL_MEM_READ_ONLY,
sizeof(unsigned int) * blue_noise_offsets_.size(), nullptr,
@ -713,6 +711,10 @@ std::unique_ptr<Image> Image::ToColorDitheredWithBlueNoise(Image *blue_noise) {
}
}
if (!is_preserving_blue_noise_offsets_) {
GenerateBlueNoiseOffsets();
}
if (!opencl_handle->SetKernelBufferData(
color_kernel_name, kBufferBlueNoiseOffsetsName,
blue_noise_offsets_.size() * sizeof(unsigned int),
@ -1413,12 +1415,11 @@ const std::string &Image::GetColorKernelName() {
}
void Image::GenerateBlueNoiseOffsets() {
std::srand(std::time(nullptr));
while (DuplicateBlueNoiseOffsetExists()) {
do {
for (unsigned int i = 0; i < blue_noise_offsets_.size(); ++i) {
blue_noise_offsets_.at(i) = rand() % kBlueNoiseOffsetMax;
}
}
} while (DuplicateBlueNoiseOffsetExists());
}
bool Image::DuplicateBlueNoiseOffsetExists() const {