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Can change canvas background color

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This commit is contained in:
Yousef Khadadeh 2025-08-01 10:58:45 +03:00
parent 0b1cc8d4c2
commit 6cec654d4c
12 changed files with 93 additions and 25 deletions
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41
src/GridManager.cpp
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@ -8,20 +8,33 @@
#define GRID_CACHE_SIZE_INT 10
#define GRID_DOT_SIZE 0.5f
// NOTE: Skia shaders return premultiplied alpha colors
const char* squareDotGridSkSl =
R"V(half4 main(float2 fragCoord) {
R"V(
uniform vec4 pointColor;
vec4 main(float2 fragCoord) {
float m1 = step(mod(fragCoord.x + 0.25, 10.0), 0.5);
float m2 = step(mod(fragCoord.y + 0.25, 10.0), 0.5);
float fin = m1 * m2;
return half4(fin);
vec4 pointColorUnmultiplied = vec4(pointColor.rgb, 1.0);
return pointColorUnmultiplied * pointColor.a * fin;
})V";
const char* circleDotGridSkSl =
R"V(half4 main(float2 fragCoord) {
R"V(
uniform vec4 pointColor;
vec4 main(float2 fragCoord) {
float2 modCoord = mod(fragCoord + float2(5.0), float2(10.0));
float fin = step(distance(float2(5.0), modCoord), 0.25);
return half4(fin);
vec4 pointColorUnmultiplied = vec4(pointColor.rgb, 1.0);
return pointColorUnmultiplied * pointColor.a * fin;
})V";
GridManager::GridManager(MainProgram& initMain):
@ -32,16 +45,21 @@ GridManager::GridManager(MainProgram& initMain):
std::cout << "[GridManager::GridManager] Circle dot shader construction error\n";
std::cout << err.c_str() << std::endl;
}
else
circleDotShader = effect->makeShader(nullptr, {nullptr, 0});
circleDotEffect = effect;
auto [effect2, err2] = SkRuntimeEffect::MakeForShader(SkString(squareDotGridSkSl));
if(!err2.isEmpty()) {
std::cout << "[GridManager::GridManager] Square dot shader construction error\n";
std::cout << err2.c_str() << std::endl;
}
else
squareDotShader = effect2->makeShader(nullptr, {nullptr, 0});
squareDotEffect = effect2;
}
sk_sp<SkShader> GridManager::get_shader(const sk_sp<SkRuntimeEffect>& runtimeEffect, const SkColor4f& pointColor) {
SkRuntimeShaderBuilder builder(runtimeEffect);
builder.uniform("pointColor") = pointColor;
sk_sp<SkShader> s = builder.makeShader();
return s;
}
void GridManager::draw(SkCanvas* canvas, const DrawData& drawData) {
@ -73,11 +91,12 @@ void GridManager::draw(SkCanvas* canvas, const DrawData& drawData) {
SkPaint linePaint;
if(gridType == GRIDTYPE_CIRCLEDOT || gridType == GRIDTYPE_SQUAREDOT) {
linePaint.setShader(gridType == 1 ? circleDotShader : squareDotShader);
linePaint.setAlphaf(std::clamp(alteredZoom / 20.0f, 0.0f, 0.4f));
SkColor4f pointColor = main.world->canvasTheme.toolFrontColor;
pointColor.fA = std::clamp(alteredZoom / 20.0f, 0.0f, 0.4f);
linePaint.setShader(get_shader(gridType == 1 ? circleDotEffect : squareDotEffect, pointColor));
}
else if(gridType == GRIDTYPE_LINE) {
linePaint.setColor4f({1.0f, 1.0f, 1.0f, 1.0f});
linePaint.setColor4f(main.world->canvasTheme.toolFrontColor);
linePaint.setStyle(SkPaint::kStroke_Style);
linePaint.setStrokeWidth(0.0f);
linePaint.setAlphaf(std::clamp(alteredZoom / 35.0f, 0.0f, 0.3f));