8d2e79aaab
The issue with wrapping is that it requires correct interpolation of the border pixels. Since interpolation is done at the far left end of the node tree in buffer/image/etc read operations, the wrapping setting can not be used directly in those operations (otherwise in-line translate operations would cause conflicts). To make wrapping work correctly we need to add a buffer in front of the translate operation, which can then be interpolated correctly based on wrapping. The WrapOperation becomes a variant of ReadBufferOperation, which uses its wrapping setting to determine the correct "extend" mode for interpolation of the buffer.
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor:
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* Jeroen Bakker
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* Monique Dewanchand
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* Thomas Beck (plasmasolutions.de)
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*/
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#include "COM_WrapOperation.h"
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WrapOperation::WrapOperation() : ReadBufferOperation()
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{
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this->m_wrappingType = CMP_NODE_WRAP_NONE;
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}
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inline float WrapOperation::getWrappedOriginalXPos(float x)
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{
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if (this->getWidth() == 0) return 0;
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while (x < 0) x += this->m_width;
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return fmodf(x, this->getWidth());
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}
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inline float WrapOperation::getWrappedOriginalYPos(float y)
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{
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if (this->getHeight() == 0) return 0;
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while (y < 0) y += this->m_height;
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return fmodf(y, this->getHeight());
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}
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void WrapOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
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{
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float nx, ny;
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nx = x;
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ny = y;
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MemoryBufferExtend extend_x = COM_MB_CLIP, extend_y = COM_MB_CLIP;
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switch (m_wrappingType) {
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case CMP_NODE_WRAP_NONE:
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//Intentionally empty, originalXPos and originalYPos have been set before
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break;
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case CMP_NODE_WRAP_X:
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// wrap only on the x-axis
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nx = this->getWrappedOriginalXPos(x);
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extend_x = COM_MB_REPEAT;
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break;
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case CMP_NODE_WRAP_Y:
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// wrap only on the y-axis
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ny = this->getWrappedOriginalYPos(y);
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extend_y = COM_MB_REPEAT;
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break;
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case CMP_NODE_WRAP_XY:
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// wrap on both
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nx = this->getWrappedOriginalXPos(x);
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ny = this->getWrappedOriginalYPos(y);
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extend_x = COM_MB_REPEAT;
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extend_y = COM_MB_REPEAT;
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break;
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}
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executePixelExtend(output, nx, ny, sampler, extend_x, extend_y);
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}
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bool WrapOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
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{
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rcti newInput;
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newInput.xmin = input->xmin;
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newInput.xmax = input->xmax;
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newInput.ymin = input->ymin;
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newInput.ymax = input->ymax;
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if (m_wrappingType == 1 || m_wrappingType == 3) {
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// wrap only on the x-axis if tile is wrapping
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newInput.xmin = getWrappedOriginalXPos(input->xmin);
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newInput.xmax = getWrappedOriginalXPos(input->xmax);
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if (newInput.xmin > newInput.xmax) {
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newInput.xmin = 0;
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newInput.xmax = this->getWidth();
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}
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}
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if (m_wrappingType == 2 || m_wrappingType == 3) {
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// wrap only on the y-axis if tile is wrapping
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newInput.ymin = getWrappedOriginalYPos(input->ymin);
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newInput.ymax = getWrappedOriginalYPos(input->ymax);
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if (newInput.ymin > newInput.ymax) {
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newInput.ymin = 0;
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newInput.ymax = this->getHeight();
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}
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}
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return ReadBufferOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
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}
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void WrapOperation::setWrapping(int wrapping_type)
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{
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m_wrappingType = wrapping_type;
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}
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