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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2022 Blender Foundation. All rights reserved. */
#pragma once
/** \file
* \ingroup imbuf
*
* Rasterizer drawing target.
*/
#include "BLI_sys_types.h"
namespace blender::imbuf::rasterizer {
/**
* An abstract implementation of a drawing target. Will make it possible to switch to other render
* targets then only ImBuf types.
*/
template<typename Inner> class AbstractDrawingTarget {
public:
using InnerType = Inner;
virtual uint64_t get_width() const = 0;
virtual uint64_t get_height() const = 0;
virtual float *get_pixel_ptr(uint64_t x, uint64_t y) = 0;
virtual int64_t get_pixel_stride() const = 0;
virtual bool has_active_target() const = 0;
virtual void activate(Inner *instance) = 0;
virtual void deactivate() = 0;
};
class ImageBufferDrawingTarget : public AbstractDrawingTarget<ImBuf> {
private:
ImBuf *image_buffer_ = nullptr;
public:
bool has_active_target() const override
{
return image_buffer_ != nullptr;
}
void activate(ImBuf *image_buffer) override
{
image_buffer_ = image_buffer;
}
void deactivate() override
{
image_buffer_ = nullptr;
}
uint64_t get_width() const override
{
return image_buffer_->x;
};
uint64_t get_height() const override
{
return image_buffer_->y;
}
float *get_pixel_ptr(uint64_t x, uint64_t y) override
{
BLI_assert(has_active_target());
uint64_t pixel_index = y * image_buffer_->x + x;
return &image_buffer_->rect_float[pixel_index * 4];
}
int64_t get_pixel_stride() const override
{
return 4;
}
};
} // namespace blender::imbuf::rasterizer
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