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From: | Frederic Konrad |
Subject: | Re: [Qemu-devel] [PATCH 3/8] console: add qemu_alloc_display_format. |
Date: | Mon, 18 May 2015 09:51:20 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 18/05/2015 09:34, Gerd Hoffmann wrote:
On Mi, 2015-05-13 at 21:12 +0200, address@hidden wrote:From: KONRAD Frederic <address@hidden> This allows to create a surface with a different format than xrgb8888.What is the use case for this? cheers, Gerd
Hi,The Display Port introduced in patch 7 and the driver use differents pixel format.
eg: rgb565, RGB888, etc. see xilinx_dp_change_graphic_fmt in patch 7: +static void xilinx_dp_change_graphic_fmt(XilinxDPState *s) +{ + switch (s->avbufm_registers[AV_BUF_FORMAT] & DP_GRAPHIC_MASK) { + case DP_GRAPHIC_RGBA8888: + s->planes[0].format = PIXMAN_r8g8b8a8; + break; + case DP_GRAPHIC_ABGR8888: + s->planes[0].format = PIXMAN_a8b8g8r8; + break; + case DP_GRAPHIC_RGB565: + s->planes[0].format = PIXMAN_r5g6b5; + break; + case DP_GRAPHIC_RGB888: + s->planes[0].format = PIXMAN_r8g8b8; + break; + case DP_GRAPHIC_BGR888: + s->planes[0].format = PIXMAN_b8g8r8; + break; + default: + DPRINTF("error: unsupported graphic format %u.\n", + s->avbufm_registers[AV_BUF_FORMAT] & DP_GRAPHIC_MASK); + abort(); + break; + } + + switch (s->avbufm_registers[AV_BUF_FORMAT] & DP_NL_VID_FMT_MASK) { + case 0: + s->planes[1].format = PIXMAN_r8g8b8a8; + break; + case DP_NL_VID_RGBA8880: + s->planes[1].format = PIXMAN_r8g8b8a8; + break; + default: + DPRINTF("error: unsupported video format %u.\n", + s->avbufm_registers[AV_BUF_FORMAT] & DP_NL_VID_FMT_MASK); + abort(); + break; + } + + xilinx_dp_recreate_surface(s); +} It needs alpha blending of two planes as well. I do this work with pixman. Thanks, Fred
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