1 files changed, 393 insertions, 0 deletions
diff --git a/gfx/wr/webrender/res/brush_image.glsl b/gfx/wr/webrender/res/brush_image.glsl
new file mode 100644
index 0000000000..f40be949b9
--- /dev/null
+++ b/gfx/wr/webrender/res/brush_image.glsl
@@ -0,0 +1,393 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define VECS_PER_SPECIFIC_BRUSH 3
+
+#include shared,prim_shared,brush
+
+// Interpolated UV coordinates to sample.
+varying vec2 v_uv;
+
+#ifdef WR_FEATURE_ALPHA_PASS
+flat varying vec4 v_color;
+flat varying vec2 v_mask_swizzle;
+flat varying vec2 v_tile_repeat;
+#endif
+
+// Normalized bounds of the source image in the texture.
+flat varying vec4 v_uv_bounds;
+// Normalized bounds of the source image in the texture, adjusted to avoid
+// sampling artifacts.
+flat varying vec4 v_uv_sample_bounds;
+
+// Flag to allow perspective interpolation of UV.
+// Packed in to vector to work around bug 1630356.
+flat varying vec2 v_perspective;
+
+#ifdef WR_VERTEX_SHADER
+
+// Must match the AlphaType enum.
+#define BLEND_MODE_ALPHA            0
+#define BLEND_MODE_PREMUL_ALPHA     1
+
+struct ImageBrushData {
+    vec4 color;
+    vec4 background_color;
+    vec2 stretch_size;
+};
+
+ImageBrushData fetch_image_data(int address) {
+    vec4[3] raw_data = fetch_from_gpu_cache_3(address);
+    ImageBrushData data = ImageBrushData(
+        raw_data[0],
+        raw_data[1],
+        raw_data[2].xy
+    );
+    return data;
+}
+
+void brush_vs(
+    VertexInfo vi,
+    int prim_address,
+    RectWithEndpoint prim_rect,
+    RectWithEndpoint segment_rect,
+    ivec4 prim_user_data,
+    int specific_resource_address,
+    mat4 transform,
+    PictureTask pic_task,
+    int brush_flags,
+    vec4 segment_data
+) {
+    ImageBrushData image_data = fetch_image_data(prim_address);
+
+    // If this is in WR_FEATURE_TEXTURE_RECT mode, the rect and size use
+    // non-normalized texture coordinates.
+#ifdef WR_FEATURE_TEXTURE_RECT
+    vec2 texture_size = vec2(1, 1);
+#else
+    vec2 texture_size = vec2(TEX_SIZE(sColor0));
+#endif
+
+    ImageSource res = fetch_image_source(specific_resource_address);
+    vec2 uv0 = res.uv_rect.p0;
+    vec2 uv1 = res.uv_rect.p1;
+
+    RectWithEndpoint local_rect = prim_rect;
+    vec2 stretch_size = image_data.stretch_size;
+    if (stretch_size.x < 0.0) {
+        stretch_size = rect_size(local_rect);
+    }
+
+    // If this segment should interpolate relative to the
+    // segment, modify the parameters for that.
+    if ((brush_flags & BRUSH_FLAG_SEGMENT_RELATIVE) != 0) {
+        local_rect = segment_rect;
+        stretch_size = rect_size(local_rect);
+
+        if ((brush_flags & BRUSH_FLAG_TEXEL_RECT) != 0) {
+            // If the extra data is a texel rect, modify the UVs.
+            vec2 uv_size = res.uv_rect.p1 - res.uv_rect.p0;
+            uv0 = res.uv_rect.p0 + segment_data.xy * uv_size;
+            uv1 = res.uv_rect.p0 + segment_data.zw * uv_size;
+        }
+
+        #ifdef WR_FEATURE_REPETITION
+            // TODO(bug 1609893): Move this logic to the CPU as well as other sources of
+            // branchiness in this shader.
+            if ((brush_flags & BRUSH_FLAG_TEXEL_RECT) != 0) {
+                // Value of the stretch size with repetition. We have to compute it for
+                // both axis even if we only repeat on one axis because the value for
+                // each axis depends on what the repeated value would have been for the
+                // other axis.
+                vec2 repeated_stretch_size = stretch_size;
+                // Size of the uv rect of the segment we are considering when computing
+                // the repetitions. For the fill area it is a tad more complicated as we
+                // have to use the uv size of the top-middle segment to drive horizontal
+                // repetitions, and the size of the left-middle segment to drive vertical
+                // repetitions. So we track the reference sizes for both axis separately
+                // even though in the common case (the border segments) they are the same.
+                vec2 horizontal_uv_size = uv1 - uv0;
+                vec2 vertical_uv_size = uv1 - uv0;
+                // We use top and left sizes by default and fall back to bottom and right
+                // when a size is empty.
+                if ((brush_flags & BRUSH_FLAG_SEGMENT_NINEPATCH_MIDDLE) != 0) {
+                    repeated_stretch_size = segment_rect.p0 - prim_rect.p0;
+
+                    float epsilon = 0.001;
+
+                    // Adjust the the referecne uv size to compute vertical repetitions for
+                    // the fill area.
+                    vertical_uv_size.x = uv0.x - res.uv_rect.p0.x;
+                    if (vertical_uv_size.x < epsilon || repeated_stretch_size.x < epsilon) {
+                        vertical_uv_size.x = res.uv_rect.p1.x - uv1.x;
+                        repeated_stretch_size.x = prim_rect.p1.x - segment_rect.p1.x;
+                    }
+
+                    // Adjust the the referecne uv size to compute horizontal repetitions
+                    // for the fill area.
+                    horizontal_uv_size.y = uv0.y - res.uv_rect.p0.y;
+                    if (horizontal_uv_size.y < epsilon || repeated_stretch_size.y < epsilon) {
+                        horizontal_uv_size.y = res.uv_rect.p1.y - uv1.y;
+                        repeated_stretch_size.y = prim_rect.p1.y - segment_rect.p1.y;
+                    }
+                }
+
+                if ((brush_flags & BRUSH_FLAG_SEGMENT_REPEAT_X) != 0) {
+                    float uv_ratio = horizontal_uv_size.x / horizontal_uv_size.y;
+                    stretch_size.x = repeated_stretch_size.y * uv_ratio;
+                }
+                if ((brush_flags & BRUSH_FLAG_SEGMENT_REPEAT_Y) != 0) {
+                    float uv_ratio = vertical_uv_size.y / vertical_uv_size.x;
+                    stretch_size.y = repeated_stretch_size.x * uv_ratio;
+                }
+
+            } else {
+                if ((brush_flags & BRUSH_FLAG_SEGMENT_REPEAT_X) != 0) {
+                    stretch_size.x = segment_data.z - segment_data.x;
+                }
+                if ((brush_flags & BRUSH_FLAG_SEGMENT_REPEAT_Y) != 0) {
+                    stretch_size.y = segment_data.w - segment_data.y;
+                }
+            }
+            if ((brush_flags & BRUSH_FLAG_SEGMENT_REPEAT_X_ROUND) != 0) {
+                float segment_rect_width = segment_rect.p1.x - segment_rect.p0.x;
+                float nx = max(1.0, round(segment_rect_width / stretch_size.x));
+                stretch_size.x = segment_rect_width / nx;
+            }
+            if ((brush_flags & BRUSH_FLAG_SEGMENT_REPEAT_Y_ROUND) != 0) {
+                float segment_rect_height = segment_rect.p1.y - segment_rect.p0.y;
+                float ny = max(1.0, round(segment_rect_height / stretch_size.y));
+                stretch_size.y = segment_rect_height / ny;
+            }
+        #endif
+    }
+
+    float perspective_interpolate = (brush_flags & BRUSH_FLAG_PERSPECTIVE_INTERPOLATION) != 0 ? 1.0 : 0.0;
+    v_perspective.x = perspective_interpolate;
+
+    // Handle case where the UV coords are inverted (e.g. from an
+    // external image).
+    vec2 min_uv = min(uv0, uv1);
+    vec2 max_uv = max(uv0, uv1);
+
+    v_uv_sample_bounds = vec4(
+        min_uv + vec2(0.5),
+        max_uv - vec2(0.5)
+    ) / texture_size.xyxy;
+
+    vec2 f = (vi.local_pos - local_rect.p0) / rect_size(local_rect);
+
+#ifdef WR_FEATURE_ALPHA_PASS
+    int color_mode = prim_user_data.x & 0xffff;
+    int blend_mode = prim_user_data.x >> 16;
+
+    if (color_mode == COLOR_MODE_FROM_PASS) {
+        color_mode = uMode;
+    }
+
+#endif
+
+    // Derive the texture coordinates for this image, based on
+    // whether the source image is a local-space or screen-space
+    // image.
+    int raster_space = prim_user_data.y;
+    if (raster_space == RASTER_SCREEN) {
+        // Since the screen space UVs specify an arbitrary quad, do
+        // a bilinear interpolation to get the correct UV for this
+        // local position.
+        f = get_image_quad_uv(specific_resource_address, f);
+    }
+
+    // Offset and scale v_uv here to avoid doing it in the fragment shader.
+    vec2 repeat = rect_size(local_rect) / stretch_size;
+    v_uv = mix(uv0, uv1, f) - min_uv;
+    v_uv /= texture_size;
+    v_uv *= repeat.xy;
+    if (perspective_interpolate == 0.0) {
+        v_uv *= vi.world_pos.w;
+    }
+
+#ifdef WR_FEATURE_TEXTURE_RECT
+    v_uv_bounds = vec4(0.0, 0.0, vec2(textureSize(sColor0)));
+#else
+    v_uv_bounds = vec4(min_uv, max_uv) / texture_size.xyxy;
+#endif
+
+#ifdef WR_FEATURE_REPETITION
+    // Normalize UV to 0..1 scale only if using repetition. Otherwise, leave
+    // UVs unnormalized since we won't compute a modulus without repetition
+    // enabled.
+    v_uv /= (v_uv_bounds.zw - v_uv_bounds.xy);
+#endif
+
+#ifdef WR_FEATURE_ALPHA_PASS
+    v_tile_repeat = repeat.xy;
+
+    float opacity = float(prim_user_data.z) / 65535.0;
+    switch (blend_mode) {
+        case BLEND_MODE_ALPHA:
+            image_data.color.a *= opacity;
+            break;
+        case BLEND_MODE_PREMUL_ALPHA:
+        default:
+            image_data.color *= opacity;
+            break;
+    }
+
+    switch (color_mode) {
+        case COLOR_MODE_ALPHA:
+        case COLOR_MODE_BITMAP_SHADOW:
+            #ifdef SWGL_BLEND
+                swgl_blendDropShadow(image_data.color);
+                v_mask_swizzle = vec2(1.0, 0.0);
+                v_color = vec4(1.0);
+            #else
+                v_mask_swizzle = vec2(0.0, 1.0);
+                v_color = image_data.color;
+            #endif
+            break;
+        case COLOR_MODE_SUBPX_BG_PASS2:
+        case COLOR_MODE_IMAGE:
+            v_mask_swizzle = vec2(1.0, 0.0);
+            v_color = image_data.color;
+            break;
+        case COLOR_MODE_SUBPX_BG_PASS0:
+        case COLOR_MODE_COLOR_BITMAP:
+            v_mask_swizzle = vec2(1.0, 0.0);
+            v_color = vec4(image_data.color.a);
+            break;
+        case COLOR_MODE_SUBPX_BG_PASS1:
+            v_mask_swizzle = vec2(-1.0, 1.0);
+            v_color = vec4(image_data.color.a) * image_data.background_color;
+            break;
+        case COLOR_MODE_SUBPX_DUAL_SOURCE:
+            v_mask_swizzle = vec2(image_data.color.a, 0.0);
+            v_color = image_data.color;
+            break;
+        case COLOR_MODE_MULTIPLY_DUAL_SOURCE:
+            v_mask_swizzle = vec2(-image_data.color.a, image_data.color.a);
+            v_color = image_data.color;
+            break;
+        default:
+            v_mask_swizzle = vec2(0.0);
+            v_color = vec4(1.0);
+    }
+#endif
+}
+#endif
+
+#ifdef WR_FRAGMENT_SHADER
+
+vec2 compute_repeated_uvs(float perspective_divisor) {
+#ifdef WR_FEATURE_REPETITION
+    vec2 uv_size = v_uv_bounds.zw - v_uv_bounds.xy;
+
+    #ifdef WR_FEATURE_ALPHA_PASS
+    // This prevents the uv on the top and left parts of the primitive that was inflated
+    // for anti-aliasing purposes from going beyound the range covered by the regular
+    // (non-inflated) primitive.
+    vec2 local_uv = max(v_uv * perspective_divisor, vec2(0.0));
+
+    // Handle horizontal and vertical repetitions.
+    vec2 repeated_uv = fract(local_uv) * uv_size + v_uv_bounds.xy;
+
+    // This takes care of the bottom and right inflated parts.
+    // We do it after the modulo because the latter wraps around the values exactly on
+    // the right and bottom edges, which we do not want.
+    if (local_uv.x >= v_tile_repeat.x) {
+        repeated_uv.x = v_uv_bounds.z;
+    }
+    if (local_uv.y >= v_tile_repeat.y) {
+        repeated_uv.y = v_uv_bounds.w;
+    }
+    #else
+    vec2 repeated_uv = fract(v_uv * perspective_divisor) * uv_size + v_uv_bounds.xy;
+    #endif
+
+    return repeated_uv;
+#else
+    return v_uv * perspective_divisor + v_uv_bounds.xy;
+#endif
+}
+
+Fragment brush_fs() {
+    float perspective_divisor = mix(gl_FragCoord.w, 1.0, v_perspective.x);
+    vec2 repeated_uv = compute_repeated_uvs(perspective_divisor);
+
+    // Clamp the uvs to avoid sampling artifacts.
+    vec2 uv = clamp(repeated_uv, v_uv_sample_bounds.xy, v_uv_sample_bounds.zw);
+
+    vec4 texel = TEX_SAMPLE(sColor0, uv);
+
+    Fragment frag;
+
+#ifdef WR_FEATURE_ALPHA_PASS
+    #ifdef WR_FEATURE_ANTIALIASING
+        float alpha = antialias_brush();
+    #else
+        float alpha = 1.0;
+    #endif
+    #ifndef WR_FEATURE_DUAL_SOURCE_BLENDING
+        texel.rgb = texel.rgb * v_mask_swizzle.x + texel.aaa * v_mask_swizzle.y;
+    #endif
+
+    vec4 alpha_mask = texel * alpha;
+    frag.color = v_color * alpha_mask;
+
+    #ifdef WR_FEATURE_DUAL_SOURCE_BLENDING
+        frag.blend = alpha_mask * v_mask_swizzle.x + alpha_mask.aaaa * v_mask_swizzle.y;
+    #endif
+#else
+    frag.color = texel;
+#endif
+
+    return frag;
+}
+
+#if defined(SWGL_DRAW_SPAN) && (!defined(WR_FEATURE_ALPHA_PASS) || !defined(WR_FEATURE_DUAL_SOURCE_BLENDING))
+void swgl_drawSpanRGBA8() {
+    if (!swgl_isTextureRGBA8(sColor0)) {
+        return;
+    }
+
+    #ifdef WR_FEATURE_ALPHA_PASS
+        if (v_mask_swizzle != vec2(1.0, 0.0)) {
+            return;
+        }
+    #endif
+
+    float perspective_divisor = mix(swgl_forceScalar(gl_FragCoord.w), 1.0, v_perspective.x);
+
+    #ifdef WR_FEATURE_REPETITION
+        // Get the UVs before any repetition, scaling, or offsetting has occurred...
+        vec2 uv = v_uv * perspective_divisor;
+    #else
+        vec2 uv = compute_repeated_uvs(perspective_divisor);
+    #endif
+
+    #ifdef WR_FEATURE_ALPHA_PASS
+    if (v_color != vec4(1.0)) {
+        #ifdef WR_FEATURE_REPETITION
+            swgl_commitTextureRepeatColorRGBA8(sColor0, uv, v_tile_repeat, v_uv_bounds, v_uv_sample_bounds, v_color);
+        #else
+            swgl_commitTextureColorRGBA8(sColor0, uv, v_uv_sample_bounds, v_color);
+        #endif
+        return;
+    }
+    // No color scaling required, so just fall through to a normal textured span...
+    #endif
+
+    #ifdef WR_FEATURE_REPETITION
+        #ifdef WR_FEATURE_ALPHA_PASS
+            swgl_commitTextureRepeatRGBA8(sColor0, uv, v_tile_repeat, v_uv_bounds, v_uv_sample_bounds);
+        #else
+            swgl_commitTextureRepeatRGBA8(sColor0, uv, vec2(0.0), v_uv_bounds, v_uv_sample_bounds);
+        #endif
+    #else
+        swgl_commitTextureRGBA8(sColor0, uv, v_uv_sample_bounds);
+    #endif
+}
+#endif
+
+#endif