Enlarging an image fails on Android Huawei ALE-L02

[hajimehoshi]

Reported by @wasedaigo . This is different from #879. I have not confirmed yet.

[hajimehoshi]

[hajimehoshi]

The fundamental fix is:

diff --git a/mipmap.go b/mipmap.go
index aa8fe158..452dbbb8 100644
--- a/mipmap.go
+++ b/mipmap.go
@@ -111,8 +111,9 @@ func (m *mipmap) drawImage(src *mipmap, bounds image.Rectangle, geom *GeoM, colo
        if level > 6 {
                level = 6
        }
-       if level < -6 {
-               level = -6
+       // If tooBigScale is 4, level -10 means that the maximum scale is 4 * 2^10 = 4096. This should be enough.
+       if level < -10 {
+               level = -10
        }

        cr, cg, cb, ca := float32(1), float32(1), float32(1), float32(1)
@@ -303,7 +304,10 @@ func (m *mipmap) mipmapLevel(geom *GeoM, width, height int, filter driver.Filter

        // Use 'negative' mipmap to render edges correctly (#611, #907).
        // It looks like 128 is the enlargement factor that causes edge missings to pass the test TestImageStretch.
-       const tooBigScale = 128
+       var tooBigScale float32 = 128
+       if !uiDriver().Graphics().HasHighPrecisionFloat() {
+               tooBigScale = 4
+       }
        if sx, sy := geomScaleSize(geom); sx >= tooBigScale || sy >= tooBigScale {
                // If the filter is not nearest, the target needs to be rendered with graduation. Don't use mipmaps.
                if filter != driver.FilterNearest {

The problem is that HasHighPrecisionFloat cannot be called when the game is not started.

[hajimehoshi]

Let's move the mipmap part so that buffered package will be a user. buffer.Image will have DrawImage.

[hajimehoshi]

I changed the milestone because

• This is not so a serious bug (hopefully)
• This requires a relatively big change
• Android user cannot use Go modules so far then fixing master branch is enough