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Diffstat (limited to 'intern/cycles/util/image_impl.h')
| -rw-r--r-- | intern/cycles/util/image_impl.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/intern/cycles/util/image_impl.h b/intern/cycles/util/image_impl.h new file mode 100644 index 00000000000..3d8eed80775 --- /dev/null +++ b/intern/cycles/util/image_impl.h @@ -0,0 +1,175 @@ +/* + * Copyright 2011-2016 Blender Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef __UTIL_IMAGE_IMPL_H__ +#define __UTIL_IMAGE_IMPL_H__ + +#include "util/algorithm.h" +#include "util/half.h" +#include "util/image.h" + +CCL_NAMESPACE_BEGIN + +namespace { + +template<typename T> +const T *util_image_read(const vector<T> &pixels, + const size_t width, + const size_t height, + const size_t /*depth*/, + const size_t components, + const size_t x, + const size_t y, + const size_t z) +{ + const size_t index = ((size_t)z * (width * height) + (size_t)y * width + (size_t)x) * components; + return &pixels[index]; +} + +template<typename T> +void util_image_downscale_sample(const vector<T> &pixels, + const size_t width, + const size_t height, + const size_t depth, + const size_t components, + const size_t kernel_size, + const float x, + const float y, + const float z, + T *result) +{ + assert(components <= 4); + const size_t ix = (size_t)x, iy = (size_t)y, iz = (size_t)z; + /* TODO(sergey): Support something smarter than box filer. */ + float accum[4] = {0}; + size_t count = 0; + for (size_t dz = 0; dz < kernel_size; ++dz) { + for (size_t dy = 0; dy < kernel_size; ++dy) { + for (size_t dx = 0; dx < kernel_size; ++dx) { + const size_t nx = ix + dx, ny = iy + dy, nz = iz + dz; + if (nx >= width || ny >= height || nz >= depth) { + continue; + } + const T *pixel = util_image_read(pixels, width, height, depth, components, nx, ny, nz); + for (size_t k = 0; k < components; ++k) { + accum[k] += util_image_cast_to_float(pixel[k]); + } + ++count; + } + } + } + if (count != 0) { + const float inv_count = 1.0f / (float)count; + for (size_t k = 0; k < components; ++k) { + result[k] = util_image_cast_from_float<T>(accum[k] * inv_count); + } + } + else { + for (size_t k = 0; k < components; ++k) { + result[k] = T(0.0f); + } + } +} + +template<typename T> +void util_image_downscale_pixels(const vector<T> &input_pixels, + const size_t input_width, + const size_t input_height, + const size_t input_depth, + const size_t components, + const float inv_scale_factor, + const size_t output_width, + const size_t output_height, + const size_t output_depth, + vector<T> *output_pixels) +{ + const size_t kernel_size = (size_t)(inv_scale_factor + 0.5f); + for (size_t z = 0; z < output_depth; ++z) { + for (size_t y = 0; y < output_height; ++y) { + for (size_t x = 0; x < output_width; ++x) { + const float input_x = (float)x * inv_scale_factor, input_y = (float)y * inv_scale_factor, + input_z = (float)z * inv_scale_factor; + const size_t output_index = (z * output_width * output_height + y * output_width + x) * + components; + util_image_downscale_sample(input_pixels, + input_width, + input_height, + input_depth, + components, + kernel_size, + input_x, + input_y, + input_z, + &output_pixels->at(output_index)); + } + } + } +} + +} /* namespace */ + +template<typename T> +void util_image_resize_pixels(const vector<T> &input_pixels, + const size_t input_width, + const size_t input_height, + const size_t input_depth, + const size_t components, + const float scale_factor, + vector<T> *output_pixels, + size_t *output_width, + size_t *output_height, + size_t *output_depth) +{ + /* Early output for case when no scaling is applied. */ + if (scale_factor == 1.0f) { + *output_width = input_width; + *output_height = input_height; + *output_depth = input_depth; + *output_pixels = input_pixels; + return; + } + /* First of all, we calculate output image dimensions. + * We clamp them to be 1 pixel at least so we do not generate degenerate + * image. + */ + *output_width = max((size_t)((float)input_width * scale_factor), (size_t)1); + *output_height = max((size_t)((float)input_height * scale_factor), (size_t)1); + *output_depth = max((size_t)((float)input_depth * scale_factor), (size_t)1); + /* Prepare pixel storage for the result. */ + const size_t num_output_pixels = ((*output_width) * (*output_height) * (*output_depth)) * + components; + output_pixels->resize(num_output_pixels); + if (scale_factor < 1.0f) { + const float inv_scale_factor = 1.0f / scale_factor; + util_image_downscale_pixels(input_pixels, + input_width, + input_height, + input_depth, + components, + inv_scale_factor, + *output_width, + *output_height, + *output_depth, + output_pixels); + } + else { + /* TODO(sergey): Needs implementation. */ + } +} + +CCL_NAMESPACE_END + +#endif /* __UTIL_IMAGE_IMPL_H__ */ |