Message ID | 20240215101119.12629-8-shawn.sung@mediatek.com |
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State | New |
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Thu, 15 Feb 2024 18:11:23 +0800 Received: from mtkmbs13n2.mediatek.inc (172.21.101.108) by MTKMBS14N1.mediatek.inc (172.21.101.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Thu, 15 Feb 2024 18:11:22 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Thu, 15 Feb 2024 18:11:22 +0800 From: Hsiao Chien Sung <shawn.sung@mediatek.com> To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, Chun-Kuang Hu <chunkuang.hu@kernel.org> CC: Philipp Zabel <p.zabel@pengutronix.de>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Matthias Brugger <matthias.bgg@gmail.com>, Bibby Hsieh <bibby.hsieh@mediatek.com>, CK Hu <ck.hu@mediatek.com>, Sean Paul <seanpaul@chromium.org>, Fei Shao <fshao@chromium.org>, Jason Chen <jason-ch.chen@mediatek.corp-partner.google.com>, "Nancy . 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Series |
Support IGT in display driver
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Commit Message
Shawn Sung (宋孝謙)
Feb. 15, 2024, 10:11 a.m. UTC
Support "Pre-multiplied" and "None" blend mode on MediaTek's chips by adding correct blend mode property when the planes init. Before this patch, only the "Coverage" mode (default) is supported. For more information, there are three pixel blend modes in DRM driver: "None", "Pre-multiplied", and "Coverage". To understand the difference between these modes, let's take a look at the following two approaches to do alpha blending: 1. Straight: dst.RGB = src.RGB * src.A + dst.RGB * (1 - src.A) This is straightforward and easy to understand, when the source layer is compositing with the destination layer, it's alpha will affect the result. This is also known as "post-multiplied", or "Coverage" mode. 2. Pre-multiplied: dst.RGB = src.RGB + dst.RGB * (1 - src.A) Since the source RGB have already multiplied its alpha, only destination RGB need to multiply it. This is the "Pre-multiplied" mode in DRM. For the "None" blend mode in DRM, it means the pixel alpha is ignored when compositing the layers, only the constant alpha for the composited layer will take effects. Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> Reviewed-by: CK Hu <ck.hu@mediatek.com> --- drivers/gpu/drm/mediatek/mtk_drm_plane.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
Comments
Il 15/02/24 11:11, Hsiao Chien Sung ha scritto: > Support "Pre-multiplied" and "None" blend mode on MediaTek's chips by > adding correct blend mode property when the planes init. > Before this patch, only the "Coverage" mode (default) is supported. > > For more information, there are three pixel blend modes in DRM driver: > "None", "Pre-multiplied", and "Coverage". > > To understand the difference between these modes, let's take a look at > the following two approaches to do alpha blending: > > 1. Straight: > dst.RGB = src.RGB * src.A + dst.RGB * (1 - src.A) > This is straightforward and easy to understand, when the source layer is > compositing with the destination layer, it's alpha will affect the > result. This is also known as "post-multiplied", or "Coverage" mode. > > 2. Pre-multiplied: > dst.RGB = src.RGB + dst.RGB * (1 - src.A) > Since the source RGB have already multiplied its alpha, only destination > RGB need to multiply it. This is the "Pre-multiplied" mode in DRM. > > For the "None" blend mode in DRM, it means the pixel alpha is ignored > when compositing the layers, only the constant alpha for the composited > layer will take effects. > > Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> > Reviewed-by: CK Hu <ck.hu@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c index 2dc28a79f7603..4e0206c45efd7 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c @@ -346,6 +346,17 @@ int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane, DRM_INFO("Create rotation property failed\n"); } + err = drm_plane_create_alpha_property(plane); + if (err) + DRM_ERROR("failed to create property: alpha\n"); + + err = drm_plane_create_blend_mode_property(plane, + BIT(DRM_MODE_BLEND_PREMULTI) | + BIT(DRM_MODE_BLEND_COVERAGE) | + BIT(DRM_MODE_BLEND_PIXEL_NONE)); + if (err) + DRM_ERROR("failed to create property: blend_mode\n"); + drm_plane_helper_add(plane, &mtk_plane_helper_funcs); return 0;