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Add support for flipping borrowed OpenGL textures vertically (#3205)

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Closes #2986

Co-authored-by: Olivier Goffart <olivier.goffart@slint-ui.com>
This commit is contained in:
Simon Hausmann 2023-08-02 13:11:13 +02:00 • committed by GitHub
parent 7ec5b01ff0
commit 0c9199b17f
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 151 additions and 23 deletions
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37
api/cpp/include/slint_image.h
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@ -110,6 +110,15 @@ private:
struct Image
{
public:
/// This enum describes the origin to use when rendering a borrowed OpenGL texture.
enum class BorrowedOpenGLTextureOrigin {
/// The top-left of the texture is the top-left of the texture drawn on the screen.
TopLeft,
/// The bottom-left of the texture is the top-left of the texture draw on the screen,
/// flipping it vertically.
BottomLeft,
};
Image() : data(Data::ImageInner_None()) { }
#ifdef SLINT_FEATURE_STD
@ -131,7 +140,8 @@ public:
/// for the pixel data.
///
/// When Slint renders the texture, it assumes that the origin of the texture is at the
/// top-left. This is different from the default OpenGL coordinate system.
/// top-left. This is different from the default OpenGL coordinate system. If you want to
/// flip the origin, use BorrowedOpenGLTextureOrigin::BottomLeft.
///
/// Safety:
///
@ -142,11 +152,20 @@ public:
/// are not sharing resources. Consequently
/// [`slint::Image`] objects created from borrowed OpenGL textures cannot be shared between
/// different windows.
[[nodiscard]] static Image create_from_borrowed_gl_2d_rgba_texture(uint32_t texture_id,
Size<uint32_t> size)
[[nodiscard]] static Image create_from_borrowed_gl_2d_rgba_texture(
uint32_t texture_id, Size<uint32_t> size,
BorrowedOpenGLTextureOrigin origin = BorrowedOpenGLTextureOrigin::TopLeft)
{
cbindgen_private::types::BorrowedOpenGLTextureOrigin origin_private =
origin == BorrowedOpenGLTextureOrigin::TopLeft
? cbindgen_private::types::BorrowedOpenGLTextureOrigin::TopLeft
: cbindgen_private::types::BorrowedOpenGLTextureOrigin::BottomLeft;
return Image(Data::ImageInner_BorrowedOpenGLTexture(
cbindgen_private::types::BorrowedOpenGLTexture { texture_id, size })
cbindgen_private::types::BorrowedOpenGLTexture {
texture_id,
size,
origin_private,
})
);
}
@ -176,7 +195,10 @@ public:
}
/// Returns the size of the Image in pixels.
Size<uint32_t> size() const { return cbindgen_private::types::slint_image_size(&data); }
Size<uint32_t> size() const
{
return cbindgen_private::types::slint_image_size(&data);
}
/// Returns the path of the image on disk, if it was constructed via Image::load_from_path().
std::optional<slint::SharedString> path() const
@ -194,7 +216,10 @@ public:
return cbindgen_private::types::slint_image_compare_equal(&a.data, &b.data);
}
/// Returns false if \a a refers to the same image as \a b; true otherwise.
friend bool operator!=(const Image &a, const Image &b) { return !(a == b); }
friend bool operator!=(const Image &a, const Image &b)
{
return !(a == b);
}
/// \private
explicit Image(cbindgen_private::types::Image inner) : data(inner) { }