From bc8e257718240f92db70b229980fc97e8317997d Mon Sep 17 00:00:00 2001 From: Samuel Gaist Date: Fri, 29 Apr 2016 15:47:52 +0200 Subject: Implement YUV 4:2:2 8bit support for QtQuick This patch implements support for rendering of UYVY and YUYV sources when using QtQuick for preview. [ChangeLog][QtQuick][Rendering] Support for YUV 4:2:2 8bit has been implemented for the QtQuick viewfinder. Change-Id: I4d98f3c44240ee53f7708bc6bd84e7fb83aac069 Reviewed-by: Yoann Lopes --- src/qtmultimediaquicktools/shaders/uyvyvideo.frag | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 src/qtmultimediaquicktools/shaders/uyvyvideo.frag (limited to 'src/qtmultimediaquicktools/shaders/uyvyvideo.frag') diff --git a/src/qtmultimediaquicktools/shaders/uyvyvideo.frag b/src/qtmultimediaquicktools/shaders/uyvyvideo.frag new file mode 100644 index 000000000..8e34f7d33 --- /dev/null +++ b/src/qtmultimediaquicktools/shaders/uyvyvideo.frag @@ -0,0 +1,22 @@ +uniform sampler2D yuvTexture; // UYVY macropixel texture passed as RGBA format +uniform float imageWidth; // The UYVY texture appears to the shader with 1/2 the image width since we use the RGBA format to pass UYVY +uniform mediump mat4 colorMatrix; +uniform lowp float opacity; + +varying highp vec2 qt_TexCoord; + +void main() +{ + // For U0 Y0 V0 Y1 macropixel, lookup Y0 or Y1 based on whether + // the original texture x coord is even or odd. + mediump float Y; + if (fract(floor(qt_TexCoord.x * imageWidth + 0.5) / 2.0) > 0.0) + Y = texture2D(yuvTexture, qt_TexCoord).a; // odd so choose Y1 + else + Y = texture2D(yuvTexture, qt_TexCoord).g; // even so choose Y0 + mediump float Cb = texture2D(yuvTexture, qt_TexCoord).r; + mediump float Cr = texture2D(yuvTexture, qt_TexCoord).b; + + mediump vec4 color = vec4(Y, Cb, Cr, 1.0); + gl_FragColor = colorMatrix * color * opacity; +} -- cgit v1.2.3