tile.cpp

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/*
 * Copyright 2011, Blender Foundation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "tile.h"

#include "util_algorithm.h"

CCL_NAMESPACE_BEGIN

TileManager::TileManager(bool progressive_, int samples_, int tile_size_, int min_size_)
{
    progressive = progressive_;
    tile_size = tile_size_;
    min_size = min_size_;

    BufferParams buffer_params;
    reset(buffer_params, 0);
}

TileManager::~TileManager()
{
}

void TileManager::reset(BufferParams& params_, int samples_)
{
    params = params_;

    start_resolution = 1;

    int w = params.width, h = params.height;

    if(min_size != INT_MAX) {
        while(w*h > min_size*min_size) {
            w = max(1, w/2); 
            h = max(1, h/2); 

            start_resolution *= 2;
        }
    }

    samples = samples_;

    state.buffer = BufferParams();
    state.sample = -1;
    state.resolution = start_resolution;
    state.tiles.clear();
}

void TileManager::set_samples(int samples_)
{
    samples = samples_;
}

void TileManager::set_tiles()
{
    int resolution = state.resolution;
    int image_w = max(1, params.width/resolution);
    int image_h = max(1, params.height/resolution);
    int tile_w = (tile_size >= image_w)? 1: (image_w + tile_size - 1)/tile_size;
    int tile_h = (tile_size >= image_h)? 1: (image_h + tile_size - 1)/tile_size;
    int sub_w = image_w/tile_w;
    int sub_h = image_h/tile_h;

    state.tiles.clear();

    for(int tile_y = 0; tile_y < tile_h; tile_y++) {
        for(int tile_x = 0; tile_x < tile_w; tile_x++) {
            int x = tile_x * sub_w;
            int y = tile_y * sub_h;
            int w = (tile_x == tile_w-1)? image_w - x: sub_w;
            int h = (tile_y == tile_h-1)? image_h - y: sub_h;

            state.tiles.push_back(Tile(x, y, w, h));
        }
    }

    state.buffer.width = image_w;
    state.buffer.height = image_h;

    state.buffer.full_x = params.full_x/resolution;
    state.buffer.full_y = params.full_y/resolution;
    state.buffer.full_width = max(1, params.full_width/resolution);
    state.buffer.full_height = max(1, params.full_height/resolution);
}

bool TileManager::done()
{
    return (state.sample+1 >= samples && state.resolution == 1);
}

bool TileManager::next()
{
    if(done())
        return false;

    if(progressive && state.resolution > 1) {
        state.sample = 0;
        state.resolution /= 2;
        set_tiles();
    }
    else {
        state.sample++;
        state.resolution = 1;
        set_tiles();
    }

    return true;
}

CCL_NAMESPACE_END