Merge branch 'master' into ext_query

piet-gpu/bin/winit.rs

@@ -41,7 +41,7 @@ fn main() -> Result<(), Error> {
         render_scene(&mut ctx);
         let n_paths = ctx.path_count();
         let n_pathseg = ctx.pathseg_count();
-        let n_trans = ctx.pathseg_count();
+        let n_trans = ctx.trans_count();
         let scene = ctx.get_scene_buf();
 
         let renderer = Renderer::new(&session, scene, n_paths, n_pathseg, n_trans)?;

piet-gpu/shader/elements.comp

@@ -386,10 +386,10 @@ void main() {
         case Element_BeginClip:
             Clip begin_clip = Element_BeginClip_read(this_ref);
             AnnoBeginClip anno_begin_clip;
+            // This is the absolute bbox, it's been transformed during encoding.
+            anno_begin_clip.bbox = begin_clip.bbox;
             if (is_stroke) {
                 vec2 lw = get_linewidth(st);
-                // This is the absolute bbox, it's been transformed during encoding.
-                anno_begin_clip.bbox = begin_clip.bbox + vec4(-lw, lw);
                 anno_begin_clip.linewidth = st.linewidth * sqrt(abs(st.mat.x * st.mat.w - st.mat.y * st.mat.z));
             } else {
                 anno_begin_clip.bbox = begin_clip.bbox;

piet-gpu/src/lib.rs

@@ -127,25 +127,12 @@ fn render_clip_test(rc: &mut impl RenderContext) {
 
 #[allow(unused)]
 fn render_alpha_test(rc: &mut impl RenderContext) {
-    // Alpha compositing tests. kernel4 expects colors encoded in alpha-premultiplied sRGB:
-    //
-    // [α,sRGB(α⋅R),sRGB(α⋅G),sRGB(α⋅B)]
-    //
-    // See also http://ssp.impulsetrain.com/gamma-premult.html.
-    rc.fill(
-        diamond(Point::new(1024.0, 100.0)),
-        &Color::Rgba32(0xff0000ff),
-    );
-    rc.fill(
-        diamond(Point::new(1024.0, 125.0)),
-        &Color::Rgba32(0x00ba0080),
-    );
+    // Alpha compositing tests.
+    rc.fill(diamond(Point::new(1024.0, 100.0)), &Color::Rgba32(0xff0000ff));
+    rc.fill(diamond(Point::new(1024.0, 125.0)), &Color::Rgba32(0x00ff0080));
     rc.save();
     rc.clip(diamond(Point::new(1024.0, 150.0)));
-    rc.fill(
-        diamond(Point::new(1024.0, 175.0)),
-        &Color::Rgba32(0x0000ba80),
-    );
+    rc.fill(diamond(Point::new(1024.0, 175.0)), &Color::Rgba32(0x0000ff80));
     rc.restore();
 }
 

piet-gpu/src/render_ctx.rs

@@ -1,21 +1,19 @@
 use std::{borrow::Cow, ops::RangeBounds};
 
-use piet_gpu_types::encoder::{Encode, Encoder};
-
-use piet_gpu_types::scene::{
-    Clip, CubicSeg, Element, FillColor, LineSeg, QuadSeg, SetFillMode, SetLineWidth, Transform,
-};
-
 use piet::{
-    kurbo::{Affine, Insets, PathEl, Point, Rect, Shape, Size},
-    HitTestPosition, TextAttribute, TextStorage,
+    HitTestPosition,
+    kurbo::{Affine, Insets, PathEl, Point, Rect, Shape, Size}, TextAttribute, TextStorage,
 };
-
 use piet::{
     Color, Error, FixedGradient, FontFamily, HitTestPoint, ImageFormat, InterpolationMode,
     IntoBrush, LineMetric, RenderContext, StrokeStyle, Text, TextLayout, TextLayoutBuilder,
 };
 
+use piet_gpu_types::encoder::{Encode, Encoder};
+use piet_gpu_types::scene::{
+    Clip, CubicSeg, Element, FillColor, LineSeg, QuadSeg, SetFillMode, SetLineWidth, Transform,
+};
+
 pub struct PietGpuImage;
 
 #[derive(Clone)]
@@ -139,7 +137,14 @@ impl RenderContext for PietGpuRenderContext {
     }
 
     fn solid_brush(&mut self, color: Color) -> Self::Brush {
-        PietGpuBrush::Solid(color.as_rgba_u32())
+        // kernel4 expects colors encoded in alpha-premultiplied sRGB:
+        //
+        // [α,sRGB(α⋅R),sRGB(α⋅G),sRGB(α⋅B)]
+        //
+        // See also http://ssp.impulsetrain.com/gamma-premult.html.
+        let (r, g, b, a) = color.as_rgba();
+        let premul = Color::rgba(to_srgb(from_srgb(r) * a), to_srgb(from_srgb(g) * a), to_srgb(from_srgb(b) * a), a);
+        PietGpuBrush::Solid(premul.as_rgba_u32())
     }
 
     fn gradient(&mut self, _gradient: impl Into<FixedGradient>) -> Result<Self::Brush, Error> {
@@ -177,8 +182,7 @@ impl RenderContext for PietGpuRenderContext {
         _brush: &impl IntoBrush<Self>,
         _width: f64,
         _style: &StrokeStyle,
-    ) {
-    }
+    ) {}
 
     fn fill(&mut self, shape: impl Shape, brush: &impl IntoBrush<Self>) {
         let brush = brush.make_brush(self, || shape.bounding_box()).into_owned();
@@ -280,8 +284,7 @@ impl RenderContext for PietGpuRenderContext {
         _image: &Self::Image,
         _rect: impl Into<Rect>,
         _interp: InterpolationMode,
-    ) {
-    }
+    ) {}
 
     fn draw_image_area(
         &mut self,
@@ -289,8 +292,7 @@ impl RenderContext for PietGpuRenderContext {
         _src_rect: impl Into<Rect>,
         _dst_rect: impl Into<Rect>,
         _interp: InterpolationMode,
-    ) {
-    }
+    ) {}
 
     fn blurred_rect(&mut self, _rect: Rect, _blur_radius: f64, _brush: &impl IntoBrush<Self>) {}
 
@@ -587,3 +589,21 @@ fn to_scene_transform(transform: Affine) -> Transform {
         translate: [c[4] as f32, c[5] as f32],
     }
 }
+
+fn to_srgb(f: f64) -> f64 {
+    if f <= 0.0031308 {
+        f * 12.92
+    } else {
+        let a = 0.055;
+        (1. + a) * f64::powf(f, f64::recip(2.4)) - a
+    }
+}
+
+fn from_srgb(f: f64) -> f64 {
+    if f <= 0.04045 {
+        f / 12.92
+    } else {
+        let a = 0.055;
+        f64::powf((f + a) * f64::recip(1. + a), 2.4)
+    }
+}