From 46f9793b84123e5fa95cb306547066d0031ceb8e Mon Sep 17 00:00:00 2001
From: Colin White <colin@colinwhite.me>
Date: Wed, 11 May 2022 16:27:35 -0400
Subject: [PATCH] Support setting custom CSS rules for SVG. (#1210)

* Support setting custom CSS rules for SVG.

* Update API.

* Remove.
---
 coil-svg/api/coil-svg.api                     | 10 ++++++++++
 .../src/main/java/coil/decode/SvgDecoder.kt   |  8 ++++++--
 coil-svg/src/main/java/coil/request/Svgs.kt   | 19 +++++++++++++++++++
 3 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 coil-svg/src/main/java/coil/request/Svgs.kt

diff --git a/coil-svg/api/coil-svg.api b/coil-svg/api/coil-svg.api
index 6cfa7ce0f6..9fa9346c2e 100644
--- a/coil-svg/api/coil-svg.api
+++ b/coil-svg/api/coil-svg.api
@@ -3,6 +3,8 @@ public final class coil/decode/SvgDecodeUtils {
 }
 
 public final class coil/decode/SvgDecoder : coil/decode/Decoder {
+	public static final field CSS_KEY Ljava/lang/String;
+	public static final field Companion Lcoil/decode/SvgDecoder$Companion;
 	public fun <init> (Lcoil/decode/ImageSource;Lcoil/request/Options;)V
 	public fun <init> (Lcoil/decode/ImageSource;Lcoil/request/Options;Z)V
 	public synthetic fun <init> (Lcoil/decode/ImageSource;Lcoil/request/Options;ZILkotlin/jvm/internal/DefaultConstructorMarker;)V
@@ -10,6 +12,9 @@ public final class coil/decode/SvgDecoder : coil/decode/Decoder {
 	public final fun getUseViewBoundsAsIntrinsicSize ()Z
 }
 
+public final class coil/decode/SvgDecoder$Companion {
+}
+
 public final class coil/decode/SvgDecoder$Factory : coil/decode/Decoder$Factory {
 	public fun <init> ()V
 	public fun <init> (Z)V
@@ -20,3 +25,8 @@ public final class coil/decode/SvgDecoder$Factory : coil/decode/Decoder$Factory
 	public fun hashCode ()I
 }
 
+public final class coil/request/Svgs {
+	public static final fun css (Lcoil/request/ImageRequest$Builder;Ljava/lang/String;)Lcoil/request/ImageRequest$Builder;
+	public static final fun css (Lcoil/request/Parameters;)Ljava/lang/String;
+}
+
diff --git a/coil-svg/src/main/java/coil/decode/SvgDecoder.kt b/coil-svg/src/main/java/coil/decode/SvgDecoder.kt
index 5fb1f7f44a..28fc31ebc7 100644
--- a/coil-svg/src/main/java/coil/decode/SvgDecoder.kt
+++ b/coil-svg/src/main/java/coil/decode/SvgDecoder.kt
@@ -7,10 +7,12 @@ import androidx.core.graphics.drawable.toDrawable
 import coil.ImageLoader
 import coil.fetch.SourceResult
 import coil.request.Options
+import coil.request.css
 import coil.size.Scale
 import coil.size.isOriginal
 import coil.util.toPx
 import coil.util.toSoftware
+import com.caverock.androidsvg.RenderOptions
 import com.caverock.androidsvg.SVG
 import kotlinx.coroutines.runInterruptible
 import kotlin.math.roundToInt
@@ -69,7 +71,8 @@ class SvgDecoder @JvmOverloads constructor(
         svg.setDocumentHeight("100%")
 
         val bitmap = createBitmap(bitmapWidth, bitmapHeight, options.config.toSoftware())
-        svg.renderToCanvas(Canvas(bitmap))
+        val renderOptions = options.parameters.css()?.let { RenderOptions().css(it) }
+        svg.renderToCanvas(Canvas(bitmap), renderOptions)
 
         DecodeResult(
             drawable = bitmap.toDrawable(options.context.resources),
@@ -110,8 +113,9 @@ class SvgDecoder @JvmOverloads constructor(
         override fun hashCode() = useViewBoundsAsIntrinsicSize.hashCode()
     }
 
-    private companion object {
+    companion object {
         private const val MIME_TYPE_SVG = "image/svg+xml"
         private const val DEFAULT_SIZE = 512f
+        const val CSS_KEY = "coil#css"
     }
 }
diff --git a/coil-svg/src/main/java/coil/request/Svgs.kt b/coil-svg/src/main/java/coil/request/Svgs.kt
new file mode 100644
index 0000000000..3572e7053e
--- /dev/null
+++ b/coil-svg/src/main/java/coil/request/Svgs.kt
@@ -0,0 +1,19 @@
+@file:Suppress("UNCHECKED_CAST")
+@file:JvmName("Svgs")
+
+package coil.request
+
+import coil.decode.SvgDecoder.Companion.CSS_KEY
+
+/**
+ * Specifies additional CSS rules that will be applied when rendering an SVG in addition to any
+ * rules specified in the SVG itself.
+ */
+fun ImageRequest.Builder.css(css: String): ImageRequest.Builder {
+    return setParameter(CSS_KEY, css)
+}
+
+/**
+ * Get the additional CSS rules.
+ */
+fun Parameters.css(): String? = value(CSS_KEY)