81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*
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* InfiniPaint
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* Copyright (C) 2025-2026 Yousef Khadadeh
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <https://www.gnu.org/licenses/>.
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*/
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#include "ColorRectangleDisplay.hpp"
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#include "../GUIManager.hpp"
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namespace GUIStuff {
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sk_sp<SkRuntimeEffect> ColorRectangleDisplay::alphaBackgroundEffect;
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ColorRectangleDisplay::ColorRectangleDisplay(GUIManager& gui): Element(gui) {}
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void ColorRectangleDisplay::layout(const Clay_ElementId& id, const std::function<SkColor4f()>& colorFunc) {
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this->colorFunc = colorFunc;
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CLAY(id, {
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.layout = {.sizing = {.width = CLAY_SIZING_GROW(0), .height = CLAY_SIZING_GROW(0)}},
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.custom = {this}
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}) {}
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}
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void ColorRectangleDisplay::update() {
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SkColor4f newDrawVal = colorFunc();
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if(newDrawVal != drawVal) {
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drawVal = newDrawVal;
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gui.invalidate_draw_element(this);
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}
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}
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void ColorRectangleDisplay::clay_draw(SkCanvas* canvas, UpdateInputData& io, Clay_RenderCommand* command, bool skiaAA) {
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auto& bb = boundingBox.value();
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SkRect r = SkRect::MakeLTRB(bb.min.x(), bb.min.y(), bb.max.x(), bb.max.y());
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if(drawVal.fA == 1.0f) {
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SkPaint p;
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p.setColor4f(drawVal);
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p.setAntiAlias(skiaAA);
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canvas->drawRect(r, p);
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}
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else {
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canvas->save();
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canvas->clipRect(r, skiaAA);
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SkPaint alphaPaint;
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alphaPaint.setShader(get_alpha_background_shader());
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canvas->drawPaint(alphaPaint);
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canvas->drawPaint(SkPaint{SkColor4f(drawVal.fR, drawVal.fG, drawVal.fB, std::sqrt(drawVal.fA))}); // Square root for alpha to keep color visible
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canvas->restore();
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}
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}
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sk_sp<SkShader> ColorRectangleDisplay::get_alpha_background_shader() {
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if(!alphaBackgroundEffect) {
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auto [effect, err] = SkRuntimeEffect::MakeForShader(SkString(alphaBackgroundSksl));
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if(!err.isEmpty()) {
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std::cout << "[ColorRectangleDisplay::get_alpha_background_shader] Alpha background shader construction error\n";
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std::cout << err.c_str() << std::endl;
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return nullptr;
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}
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else
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alphaBackgroundEffect = effect;
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}
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SkRuntimeShaderBuilder builder(alphaBackgroundEffect);
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return builder.makeShader();
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}
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}
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