mirror of
https://github.com/thorvg/thorvg.git
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308 lines
9.3 KiB
C++
308 lines
9.3 KiB
C++
/*
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* Copyright (c) 2020-2021 Samsung Electronics Co., Ltd. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <float.h>
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#include <math.h>
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#include "tvgSwCommon.h"
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/************************************************************************/
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/* Internal Class Implementation */
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/************************************************************************/
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#define GRADIENT_STOP_SIZE 1024
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#define FIXPT_BITS 8
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#define FIXPT_SIZE (1<<FIXPT_BITS)
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static bool _updateColorTable(SwFill* fill, const Fill* fdata, const SwSurface* surface, uint32_t opacity)
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{
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if (!fill->ctable) {
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fill->ctable = static_cast<uint32_t*>(malloc(GRADIENT_STOP_SIZE * sizeof(uint32_t)));
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if (!fill->ctable) return false;
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}
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const Fill::ColorStop* colors;
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auto cnt = fdata->colorStops(&colors);
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if (cnt == 0 || !colors) return false;
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auto pColors = colors;
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auto a = (pColors->a * opacity) / 255;
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if (a < 255) fill->translucent = true;
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auto r = pColors->r;
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auto g = pColors->g;
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auto b = pColors->b;
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auto rgba = surface->blender.join(r, g, b, a);
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auto inc = 1.0f / static_cast<float>(GRADIENT_STOP_SIZE);
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auto pos = 1.5f * inc;
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uint32_t i = 0;
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fill->ctable[i++] = ALPHA_BLEND(rgba | 0xff000000, a);
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while (pos <= pColors->offset) {
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fill->ctable[i] = fill->ctable[i - 1];
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++i;
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pos += inc;
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}
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for (uint32_t j = 0; j < cnt - 1; ++j) {
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auto curr = colors + j;
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auto next = curr + 1;
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auto delta = 1.0f / (next->offset - curr->offset);
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auto a2 = (next->a * opacity) / 255;
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if (!fill->translucent && a2 < 255) fill->translucent = true;
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auto rgba2 = surface->blender.join(next->r, next->g, next->b, a2);
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while (pos < next->offset && i < GRADIENT_STOP_SIZE) {
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auto t = (pos - curr->offset) * delta;
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auto dist = static_cast<int32_t>(255 * t);
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auto dist2 = 255 - dist;
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auto color = COLOR_INTERPOLATE(rgba, dist2, rgba2, dist);
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fill->ctable[i] = ALPHA_BLEND((color | 0xff000000), (color >> 24));
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++i;
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pos += inc;
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}
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rgba = rgba2;
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a = a2;
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}
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rgba = ALPHA_BLEND((rgba | 0xff000000), a);
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for (; i < GRADIENT_STOP_SIZE; ++i)
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fill->ctable[i] = rgba;
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//Make sure the last color stop is represented at the end of the table
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fill->ctable[GRADIENT_STOP_SIZE - 1] = rgba;
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return true;
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}
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bool _prepareLinear(SwFill* fill, const LinearGradient* linear, const Matrix* transform)
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{
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float x1, x2, y1, y2;
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if (linear->linear(&x1, &y1, &x2, &y2) != Result::Success) return false;
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if (transform) {
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auto t1 = x1;
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x1 = t1 * transform->e11 + y1 * transform->e12 + transform->e13;
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y1 = t1 * transform->e21 + y1 * transform->e22 + transform->e23;
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auto t2 = x2;
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x2 = t2 * transform->e11 + y2 * transform->e12 + transform->e13;
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y2 = t2 * transform->e21 + y2 * transform->e22 + transform->e23;
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}
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fill->linear.dx = x2 - x1;
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fill->linear.dy = y2 - y1;
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fill->linear.len = fill->linear.dx * fill->linear.dx + fill->linear.dy * fill->linear.dy;
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if (fill->linear.len < FLT_EPSILON) return true;
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fill->linear.dx /= fill->linear.len;
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fill->linear.dy /= fill->linear.len;
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fill->linear.offset = -fill->linear.dx * x1 -fill->linear.dy * y1;
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return true;
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}
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bool _prepareRadial(SwFill* fill, const RadialGradient* radial, const Matrix* transform)
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{
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float radius;
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if (radial->radial(&fill->radial.cx, &fill->radial.cy, &radius) != Result::Success) return false;
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if (radius < FLT_EPSILON) return true;
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fill->sx = 1.0f;
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fill->sy = 1.0f;
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if (transform) {
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auto tx = fill->radial.cx * transform->e11 + fill->radial.cy * transform->e12 + transform->e13;
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auto ty = fill->radial.cx * transform->e21 + fill->radial.cy * transform->e22 + transform->e23;
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fill->radial.cx = tx;
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fill->radial.cy = ty;
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auto sx = sqrt(pow(transform->e11, 2) + pow(transform->e21, 2));
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auto sy = sqrt(pow(transform->e12, 2) + pow(transform->e22, 2));
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//FIXME; Scale + Rotation is not working properly
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radius *= sx;
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if (abs(sx - sy) > FLT_EPSILON) {
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fill->sx = sx;
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fill->sy = sy;
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}
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}
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fill->radial.a = radius * radius;
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fill->radial.inva = 1.0 / fill->radial.a;
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return true;
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}
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static inline uint32_t _clamp(const SwFill* fill, int32_t pos)
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{
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switch (fill->spread) {
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case FillSpread::Pad: {
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if (pos >= GRADIENT_STOP_SIZE) pos = GRADIENT_STOP_SIZE - 1;
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else if (pos < 0) pos = 0;
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break;
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}
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case FillSpread::Repeat: {
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pos = pos % GRADIENT_STOP_SIZE;
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if (pos < 0) pos = GRADIENT_STOP_SIZE + pos;
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break;
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}
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case FillSpread::Reflect: {
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auto limit = GRADIENT_STOP_SIZE * 2;
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pos = pos % limit;
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if (pos < 0) pos = limit + pos;
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if (pos >= GRADIENT_STOP_SIZE) pos = (limit - pos - 1);
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break;
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}
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}
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return pos;
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}
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static inline uint32_t _fixedPixel(const SwFill* fill, int32_t pos)
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{
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int32_t i = (pos + (FIXPT_SIZE / 2)) >> FIXPT_BITS;
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return fill->ctable[_clamp(fill, i)];
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}
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static inline uint32_t _pixel(const SwFill* fill, float pos)
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{
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auto i = static_cast<int32_t>(pos * (GRADIENT_STOP_SIZE - 1) + 0.5f);
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return fill->ctable[_clamp(fill, i)];
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}
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/************************************************************************/
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/* External Class Implementation */
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/************************************************************************/
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void fillFetchRadial(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len)
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{
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//Rotation
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auto rx = (x + 0.5f - fill->radial.cx) * fill->sy;
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auto ry = (y + 0.5f - fill->radial.cy) * fill->sx;
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auto rxy = rx * rx + ry * ry;
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auto rxryPlus = 2 * rx;
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auto inva = fill->radial.inva;
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auto det = rxy * inva;
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auto detDelta = (rxryPlus + 1.0f) * inva;
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auto detDelta2 = 2.0f * inva;
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for (uint32_t i = 0 ; i < len ; ++i) {
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*dst = _pixel(fill, sqrt(det));
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++dst;
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det += detDelta;
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detDelta += detDelta2;
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}
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}
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void fillFetchLinear(const SwFill* fill, uint32_t* dst, uint32_t y, uint32_t x, uint32_t len)
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{
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//Rotation
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float rx = x + 0.5f;
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float ry = y + 0.5f;
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float t = (fill->linear.dx * rx + fill->linear.dy * ry + fill->linear.offset) * (GRADIENT_STOP_SIZE - 1);
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float inc = (fill->linear.dx) * (GRADIENT_STOP_SIZE - 1);
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if (abs(inc) < FLT_EPSILON) {
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auto color = _fixedPixel(fill, static_cast<int32_t>(t * FIXPT_SIZE));
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rasterRGBA32(dst, color, 0, len);
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return;
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}
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auto vMax = static_cast<float>(INT32_MAX >> (FIXPT_BITS + 1));
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auto vMin = -vMax;
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auto v = t + (inc * len);
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//we can use fixed point math
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if (v < vMax && v > vMin) {
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auto t2 = static_cast<int32_t>(t * FIXPT_SIZE);
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auto inc2 = static_cast<int32_t>(inc * FIXPT_SIZE);
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for (uint32_t j = 0; j < len; ++j) {
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*dst = _fixedPixel(fill, t2);
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++dst;
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t2 += inc2;
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}
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//we have to fallback to float math
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} else {
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uint32_t counter = 0;
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while (counter++ < len) {
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*dst = _pixel(fill, t / GRADIENT_STOP_SIZE);
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++dst;
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t += inc;
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}
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}
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}
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bool fillGenColorTable(SwFill* fill, const Fill* fdata, const Matrix* transform, SwSurface* surface, uint32_t opacity, bool ctable)
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{
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if (!fill) return false;
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fill->spread = fdata->spread();
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if (ctable) {
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if (!_updateColorTable(fill, fdata, surface, opacity)) return false;
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}
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if (fdata->id() == TVG_CLASS_ID_LINEAR) {
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return _prepareLinear(fill, static_cast<const LinearGradient*>(fdata), transform);
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} else if (fdata->id() == TVG_CLASS_ID_RADIAL) {
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return _prepareRadial(fill, static_cast<const RadialGradient*>(fdata), transform);
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}
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//LOG: What type of gradient?!
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return false;
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}
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void fillReset(SwFill* fill)
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{
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if (fill->ctable) {
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free(fill->ctable);
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fill->ctable = nullptr;
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}
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fill->translucent = false;
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}
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void fillFree(SwFill* fill)
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{
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if (!fill) return;
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if (fill->ctable) free(fill->ctable);
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free(fill);
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}
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