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LibAccelGfx+LibWeb: Add support for stacking context opacity

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For each stacking context with an opacity less than 1, we create a
separate framebuffer. We then blit the texture attached to this
framebuffer with the specified opacity.

To avoid the performance overhead of reading pixels from the texture
into Gfx::Bitmap, a new method that allows for direct blitting from
the texture is introduced, named blit_scaled_texture().
This commit is contained in:
Aliaksandr Kalenik 2023-11-23 15:28:51 +01:00 • committed by Andreas Kling
parent cb90daadc7
commit 5f7ac559a7
8 changed files with 133 additions and 74 deletions
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11
Userland/Libraries/LibAccelGfx/GL.cpp
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@ -114,7 +114,7 @@ Texture create_texture()
GLuint texture;
glGenTextures(1, &texture);
verify_no_error();
return { texture };
return { texture, {} };
}
void bind_texture(Texture const& texture)
@ -123,11 +123,12 @@ void bind_texture(Texture const& texture)
verify_no_error();
}
void upload_texture_data(Texture const& texture, Gfx::Bitmap const& bitmap)
void upload_texture_data(Texture& texture, Gfx::Bitmap const& bitmap)
{
VERIFY(bitmap.format() == Gfx::BitmapFormat::BGRx8888 || bitmap.format() == Gfx::BitmapFormat::BGRA8888);
bind_texture(texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap.width(), bitmap.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, bitmap.scanline(0));
texture.size = bitmap.size();
verify_no_error();
}
@ -231,7 +232,7 @@ Framebuffer create_framebuffer(Gfx::IntSize size)
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, size.width(), size.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width(), size.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
GLuint fbo;
glGenFramebuffers(1, &fbo);
@ -244,7 +245,7 @@ Framebuffer create_framebuffer(Gfx::IntSize size)
verify_no_error();
return { fbo, texture };
return { fbo, Texture { texture, size } };
}
void bind_framebuffer(Framebuffer const& framebuffer)
@ -257,7 +258,7 @@ void delete_framebuffer(Framebuffer const& framebuffer)
{
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer.fbo_id);
glDeleteFramebuffers(1, &framebuffer.fbo_id);
glDeleteTextures(1, &framebuffer.texture_id);
delete_texture(framebuffer.texture);
verify_no_error();
}