#include <cuda.h>
#include "binarize.cuh"
+#include "DeviceMemory.cuh"
using namespace FM7b5;
void
FM7b5::binarize_gpu(ImageGray& out, const ImageGray& in, const uint8_t thres)
{
-
if (in.width() != out.width() || in.height() != out.height()) {
throw std::runtime_error("sizes of input and output images are diferent.");
}
const size_t width(in.width()), height(in.height()), bpp(in.bpp());
- uint8_t* d_in(nullptr);
- uint8_t* d_out(nullptr);
- size_t in_pitch(0), out_pitch(0);
-
const size_t threads_per_dim(32);
dim3 threads_per_block(threads_per_dim, threads_per_dim);
dim3 blocks_per_grid((width + threads_per_block.x - 1)/ threads_per_block.x,
(height + threads_per_block.y - 1)/ threads_per_block.y);
- cudaError_t status;
-
// allocate input/output memories
- status = cudaMallocPitch(&d_in, &in_pitch, width * bpp, height);
- if (status != cudaSuccess) {
- goto on_error_in;
- }
-
- status = cudaMallocPitch(&d_out, &out_pitch, width * bpp, height);
- if (status != cudaSuccess) {
- goto on_error_out;
- }
+ memory::LinearPitch<uint8_t> d_in(width, height), d_out(width, height);
// copy an input image to device memory
- status = cudaMemcpy2D(d_in, in_pitch, in.data(), in.stride(), bpp * width, height, cudaMemcpyHostToDevice);
- if (status != cudaSuccess) {
- goto on_error_proc;
- }
+ d_in.copy_from(in.data(), bpp * width, height, in.stride());
// launch kernel
- binarize<<<blocks_per_grid, threads_per_block>>>(d_out, out_pitch, d_in, in_pitch, width, height, thres);
+ binarize<<<blocks_per_grid, threads_per_block>>>(d_out.ref(), d_in.ref(), width, height, thres);
// copy the result back to host memory
- status = cudaMemcpy2D(out.data(), out.stride(), d_out, out_pitch, bpp * width, height, cudaMemcpyDeviceToHost);
- if (status != cudaSuccess) {
- goto on_error_proc;
- }
-
- // free device memories
- cudaFree(d_out);
- cudaFree(d_in);
-
- return;
-
- // error handling
-on_error_proc:
- cudaFree(d_out);
-on_error_out:
- cudaFree(d_in);
-on_error_in:
- throw std::runtime_error(cudaGetErrorString(status));
-}
-
-__global__
-void
-FM7b5::binarize(uint8_t* out, const size_t out_pitch, const uint8_t* in, const size_t in_pitch, const size_t width, const size_t height, const uint8_t thres)
-{
- const size_t w(blockDim.x * blockIdx.x + threadIdx.x);
- const size_t h(blockDim.y * blockIdx.y + threadIdx.y);
-
- if (w >= width || h >= height) {
- return;
- }
-
- out[out_pitch * h + w] = (in[in_pitch * h + w] < thres) ? 0 : 255;
+ d_out.copy_to(out.data(), bpp * width, height, out.stride());
}