From c60b14998af9a69206a58c0d50a547156907bfa8 Mon Sep 17 00:00:00 2001
From: FooIbar <118464521+FooIbar@users.noreply.github.com>
Date: Tue, 3 Sep 2024 12:57:35 +0800
Subject: [PATCH] Fix crash when drawing > 100 MB bitmaps

---
 .../hippo/ehviewer/ui/reader/BitmapPainter.kt | 48 +++++++++++++++++++
 .../com/hippo/ehviewer/ui/reader/PagerItem.kt |  4 +-
 2 files changed, 49 insertions(+), 3 deletions(-)
 create mode 100644 app/src/main/kotlin/com/hippo/ehviewer/ui/reader/BitmapPainter.kt

diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/BitmapPainter.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/BitmapPainter.kt
new file mode 100644
index 000000000..77c5a02ad
--- /dev/null
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/BitmapPainter.kt
@@ -0,0 +1,48 @@
+package com.hippo.ehviewer.ui.reader
+
+import android.graphics.Bitmap
+import android.graphics.Matrix
+import android.graphics.Paint
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.drawscope.drawIntoCanvas
+import androidx.compose.ui.graphics.nativeCanvas
+import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.unit.IntOffset
+import androidx.compose.ui.unit.IntSize
+import androidx.compose.ui.unit.toOffset
+import androidx.compose.ui.unit.toSize
+
+class BitmapPainter(
+    private val image: Bitmap,
+    srcOffset: IntOffset = IntOffset.Zero,
+    srcSize: IntSize = IntSize(image.width, image.height),
+) : Painter() {
+
+    private val offset = (-srcOffset).toOffset()
+
+    private val srcSize = srcSize.toSize()
+
+    private val matrix = Matrix()
+
+    override fun DrawScope.onDraw() = drawIntoCanvas {
+        // Use the overload that takes a `Matrix` to bypass the 100 MB size limit
+        it.nativeCanvas.drawBitmap(
+            image,
+            matrix.apply {
+                setTranslate(offset.x, offset.y)
+                postScale(size.width / srcSize.width, size.height / srcSize.height)
+            },
+            bitmapPaint,
+        )
+    }
+
+    override val intrinsicSize get() = srcSize
+
+    companion object {
+        private val bitmapPaint = Paint().apply {
+            isAntiAlias = true
+            isFilterBitmap = true
+            isDither = true
+        }
+    }
+}
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt
index 62eb65eb0..e232f65e9 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt
@@ -20,8 +20,6 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.ColorFilter
 import androidx.compose.ui.graphics.ColorMatrix
-import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.graphics.painter.BitmapPainter
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
@@ -114,7 +112,7 @@ fun PagerItem(
 
 private fun Image.toPainter() = when (val image = innerImage) {
     is BitmapImage -> BitmapPainter(
-        image = image.bitmap.asImageBitmap(),
+        image = image.bitmap,
         srcOffset = rect.topLeft,
         srcSize = rect.size,
     )