mirror of
https://github.com/thorvg/thorvg.git
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319 lines
9.1 KiB
C++
319 lines
9.1 KiB
C++
/*
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* Copyright (c) 2020 - 2023 the ThorVG project. 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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#ifndef _TVG_RENDER_H_
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#define _TVG_RENDER_H_
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#include "tvgCommon.h"
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#include "tvgArray.h"
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namespace tvg
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{
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using RenderData = void*;
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using pixel_t = uint32_t;
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enum RenderUpdateFlag : uint8_t {None = 0, Path = 1, Color = 2, Gradient = 4, Stroke = 8, Transform = 16, Image = 32, GradientStroke = 64, All = 255};
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struct Surface;
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enum ColorSpace
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{
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ABGR8888 = 0, //The channels are joined in the order: alpha, blue, green, red. Colors are alpha-premultiplied.
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ARGB8888, //The channels are joined in the order: alpha, red, green, blue. Colors are alpha-premultiplied.
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ABGR8888S, //The channels are joined in the order: alpha, blue, green, red. Colors are un-alpha-premultiplied.
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ARGB8888S, //The channels are joined in the order: alpha, red, green, blue. Colors are un-alpha-premultiplied.
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Grayscale8, //One single channel data.
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Unsupported //TODO: Change to the default, At the moment, we put it in the last to align with SwCanvas::Colorspace.
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};
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struct Surface
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{
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union {
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pixel_t* data; //system based data pointer
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uint32_t* buf32; //for explicit 32bits channels
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uint8_t* buf8; //for explicit 8bits grayscale
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};
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uint32_t stride;
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uint32_t w, h;
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ColorSpace cs;
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uint8_t channelSize;
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bool premultiplied; //Alpha-premultiplied
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bool owner; //Only owner could modify the buffer
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};
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struct Compositor
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{
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CompositeMethod method;
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uint8_t opacity;
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};
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struct RenderMesh
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{
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Polygon* triangles = nullptr;
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uint32_t triangleCnt = 0;
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~RenderMesh()
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{
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free(triangles);
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}
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};
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struct RenderRegion
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{
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int32_t x, y, w, h;
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void intersect(const RenderRegion& rhs)
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{
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auto x1 = x + w;
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auto y1 = y + h;
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auto x2 = rhs.x + rhs.w;
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auto y2 = rhs.y + rhs.h;
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x = (x > rhs.x) ? x : rhs.x;
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y = (y > rhs.y) ? y : rhs.y;
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w = ((x1 < x2) ? x1 : x2) - x;
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h = ((y1 < y2) ? y1 : y2) - y;
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if (w < 0) w = 0;
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if (h < 0) h = 0;
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}
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void add(const RenderRegion& rhs)
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{
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if (rhs.x < x) {
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w += (x - rhs.x);
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x = rhs.x;
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}
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if (rhs.y < y) {
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h += (y - rhs.y);
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y = rhs.y;
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}
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if (rhs.x + rhs.w > x + w) w = (rhs.x + rhs.w) - x;
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if (rhs.y + rhs.h > y + h) h = (rhs.y + rhs.h) - y;
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}
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};
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struct RenderTransform
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{
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Matrix m; //3x3 Matrix Elements
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float x = 0.0f;
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float y = 0.0f;
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float degree = 0.0f; //rotation degree
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float scale = 1.0f; //scale factor
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bool overriding = false; //user transform?
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bool update();
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void override(const Matrix& m);
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RenderTransform();
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RenderTransform(const RenderTransform* lhs, const RenderTransform* rhs);
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};
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struct RenderStroke
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{
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float width = 0.0f;
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uint8_t color[4] = {0, 0, 0, 0};
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Fill *fill = nullptr;
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float* dashPattern = nullptr;
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uint32_t dashCnt = 0;
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StrokeCap cap = StrokeCap::Square;
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StrokeJoin join = StrokeJoin::Bevel;
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float miterlimit = 4.0f;
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bool strokeFirst = false;
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~RenderStroke()
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{
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free(dashPattern);
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delete(fill);
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}
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};
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struct RenderShape
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{
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struct
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{
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Array<PathCommand> cmds;
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Array<Point> pts;
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} path;
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Fill *fill = nullptr;
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RenderStroke *stroke = nullptr;
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uint8_t color[4] = {0, 0, 0, 0}; //r, g, b, a
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FillRule rule = FillRule::Winding;
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~RenderShape()
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{
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delete(fill);
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delete(stroke);
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}
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void fillColor(uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a) const
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{
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if (r) *r = color[0];
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if (g) *g = color[1];
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if (b) *b = color[2];
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if (a) *a = color[3];
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}
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float strokeWidth() const
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{
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if (!stroke) return 0;
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return stroke->width;
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}
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bool strokeColor(uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a) const
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{
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if (!stroke) return false;
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if (r) *r = stroke->color[0];
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if (g) *g = stroke->color[1];
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if (b) *b = stroke->color[2];
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if (a) *a = stroke->color[3];
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return true;
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}
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const Fill* strokeFill() const
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{
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if (!stroke) return nullptr;
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return stroke->fill;
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}
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uint32_t strokeDash(const float** dashPattern) const
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{
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if (!stroke) return 0;
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if (dashPattern) *dashPattern = stroke->dashPattern;
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return stroke->dashCnt;
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}
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StrokeCap strokeCap() const
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{
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if (!stroke) return StrokeCap::Square;
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return stroke->cap;
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}
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StrokeJoin strokeJoin() const
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{
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if (!stroke) return StrokeJoin::Bevel;
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return stroke->join;
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}
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float strokeMiterlimit() const
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{
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if (!stroke) return 4.0f;
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return stroke->miterlimit;;
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}
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};
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class RenderMethod
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{
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public:
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virtual ~RenderMethod() {}
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virtual RenderData prepare(const RenderShape& rshape, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper) = 0;
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virtual RenderData prepare(const Array<RenderData>& scene, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) = 0;
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virtual RenderData prepare(Surface* surface, const RenderMesh* mesh, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) = 0;
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virtual bool preRender() = 0;
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virtual bool renderShape(RenderData data) = 0;
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virtual bool renderImage(RenderData data) = 0;
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virtual bool postRender() = 0;
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virtual bool dispose(RenderData data) = 0;
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virtual RenderRegion region(RenderData data) = 0;
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virtual RenderRegion viewport() = 0;
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virtual bool viewport(const RenderRegion& vp) = 0;
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virtual bool blend(BlendMethod method) = 0;
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virtual ColorSpace colorSpace() = 0;
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virtual bool clear() = 0;
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virtual bool sync() = 0;
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virtual Compositor* target(const RenderRegion& region, ColorSpace cs) = 0;
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virtual bool beginComposite(Compositor* cmp, CompositeMethod method, uint8_t opacity) = 0;
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virtual bool endComposite(Compositor* cmp) = 0;
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};
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static inline bool MASK_OPERATION(CompositeMethod method)
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{
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switch(method) {
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case CompositeMethod::AlphaMask:
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case CompositeMethod::InvAlphaMask:
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case CompositeMethod::LumaMask:
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case CompositeMethod::InvLumaMask:
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return false;
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case CompositeMethod::AddMask:
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case CompositeMethod::SubtractMask:
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case CompositeMethod::IntersectMask:
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case CompositeMethod::DifferenceMask:
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return true;
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default:
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TVGERR("COMMON", "Unsupported Composite Size! = %d", (int)method);
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return false;
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}
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}
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static inline uint8_t CHANNEL_SIZE(ColorSpace cs)
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{
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switch(cs) {
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case ColorSpace::ABGR8888:
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case ColorSpace::ABGR8888S:
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case ColorSpace::ARGB8888:
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case ColorSpace::ARGB8888S:
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return sizeof(uint32_t);
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case ColorSpace::Grayscale8:
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return sizeof(uint8_t);
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case ColorSpace::Unsupported:
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default:
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TVGERR("SW_ENGINE", "Unsupported Channel Size! = %d", (int)cs);
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return 0;
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}
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}
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static inline ColorSpace COMPOSITE_TO_COLORSPACE(RenderMethod& renderer, CompositeMethod method)
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{
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switch(method) {
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case CompositeMethod::AlphaMask:
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case CompositeMethod::InvAlphaMask:
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return ColorSpace::Grayscale8;
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case CompositeMethod::LumaMask:
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case CompositeMethod::InvLumaMask:
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case CompositeMethod::AddMask:
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case CompositeMethod::SubtractMask:
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case CompositeMethod::IntersectMask:
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case CompositeMethod::DifferenceMask:
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return renderer.colorSpace();
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default:
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TVGERR("COMMON", "Unsupported Composite Size! = %d", (int)method);
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return ColorSpace::Unsupported;
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}
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}
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static inline uint8_t MULTIPLY(uint8_t c, uint8_t a)
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{
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return (((c) * (a) + 0xff) >> 8);
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}
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}
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#endif //_TVG_RENDER_H_
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