godot/thirdparty/thorvg/src/renderer/sw_engine/tvgSwFill.cpp

/*
 * Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "tvgMath.h"
#include "tvgSwCommon.h"
#include "tvgFill.h"

/************************************************************************/
/* Internal Class Implementation                                        */
/************************************************************************/

#define RADIAL_A_THRESHOLD …
#define GRADIENT_STOP_SIZE …
#define FIXPT_BITS …
#define FIXPT_SIZE …

/*
 * quadratic equation with the following coefficients (rx and ry defined in the _calculateCoefficients()):
 * A = a  // fill->radial.a
 * B = 2 * (dr * fr + rx * dx + ry * dy)
 * C = fr^2 - rx^2 - ry^2
 * Derivatives are computed with respect to dx.
 * This procedure aims to optimize and eliminate the need to calculate all values from the beginning
 * for consecutive x values with a constant y. The Taylor series expansions are computed as long as
 * its terms are non-zero.
 */
static void _calculateCoefficients(const SwFill* fill, uint32_t x, uint32_t y, float& b, float& deltaB, float& det, float& deltaDet, float& deltaDeltaDet)
{ … }


static uint32_t _estimateAAMargin(const Fill* fdata)
{ … }


static void _adjustAAMargin(uint32_t& iMargin, uint32_t index)
{ … }


static inline uint32_t _alphaUnblend(uint32_t c)
{ … }


static void _applyAA(const SwFill* fill, uint32_t begin, uint32_t end)
{ … }


static bool _updateColorTable(SwFill* fill, const Fill* fdata, const SwSurface* surface, uint8_t opacity)
{ … }


bool _prepareLinear(SwFill* fill, const LinearGradient* linear, const Matrix& transform)
{ … }


bool _prepareRadial(SwFill* fill, const RadialGradient* radial, const Matrix& transform)
{ … }


static inline uint32_t _clamp(const SwFill* fill, int32_t pos)
{ … }


static inline uint32_t _fixedPixel(const SwFill* fill, int32_t pos)
{ … }


static inline uint32_t _pixel(const SwFill* fill, float pos)
{ … }


/************************************************************************/
/* External Class Implementation                                        */
/************************************************************************/


void fillRadial(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len, uint8_t* cmp, SwAlpha alpha, uint8_t csize, uint8_t opacity)
{ … }


void fillRadial(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len, SwBlender op, uint8_t a)
{ … }


void fillRadial(const SwFill* fill, uint8_t* dst, uint32_t y, uint32_t x, uint32_t len, SwMask maskOp, uint8_t a)
{ … }


void fillRadial(const SwFill* fill, uint8_t* dst, uint32_t y, uint32_t x, uint32_t len, uint8_t* cmp, SwMask maskOp, uint8_t a)
{ … }


void fillRadial(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len, SwBlender op, SwBlender op2, uint8_t a)
{ … }


void fillLinear(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len, uint8_t* cmp, SwAlpha alpha, uint8_t csize, uint8_t opacity)
{ … }


void fillLinear(const SwFill* fill, uint8_t* dst, uint32_t y, uint32_t x, uint32_t len, SwMask maskOp, uint8_t a)
{ … }


void fillLinear(const SwFill* fill, uint8_t* dst, uint32_t y, uint32_t x, uint32_t len, uint8_t* cmp, SwMask maskOp, uint8_t a)
{ … }


void fillLinear(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len, SwBlender op, uint8_t a)
{ … }


void fillLinear(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len, SwBlender op, SwBlender op2, uint8_t a)
{ … }


bool fillGenColorTable(SwFill* fill, const Fill* fdata, const Matrix& transform, SwSurface* surface, uint8_t opacity, bool ctable)
{ … }


const Fill::ColorStop* fillFetchSolid(const SwFill* fill, const Fill* fdata)
{ … }


void fillReset(SwFill* fill)
{ … }


void fillFree(SwFill* fill)
{ … }