325 lines
8.7 KiB
C
325 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0 or MIT
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/*
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* Copyright (C) 2016 Noralf Trønnes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <drm/drm_format_helper.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_rect.h>
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static unsigned int clip_offset(struct drm_rect *clip,
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unsigned int pitch, unsigned int cpp)
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{
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return clip->y1 * pitch + clip->x1 * cpp;
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}
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/**
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* drm_fb_memcpy - Copy clip buffer
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* @dst: Destination buffer
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* @vaddr: Source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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*
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* This function does not apply clipping on dst, i.e. the destination
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* is a small buffer containing the clip rect only.
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*/
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void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
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struct drm_rect *clip)
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{
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unsigned int cpp = fb->format->cpp[0];
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size_t len = (clip->x2 - clip->x1) * cpp;
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unsigned int y, lines = clip->y2 - clip->y1;
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vaddr += clip_offset(clip, fb->pitches[0], cpp);
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for (y = 0; y < lines; y++) {
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memcpy(dst, vaddr, len);
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vaddr += fb->pitches[0];
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dst += len;
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}
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}
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EXPORT_SYMBOL(drm_fb_memcpy);
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/**
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* drm_fb_memcpy_dstclip - Copy clip buffer
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* @dst: Destination buffer (iomem)
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* @vaddr: Source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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*
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* This function applies clipping on dst, i.e. the destination is a
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* full (iomem) framebuffer but only the clip rect content is copied over.
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*/
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void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr,
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struct drm_framebuffer *fb,
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struct drm_rect *clip)
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{
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unsigned int cpp = fb->format->cpp[0];
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unsigned int offset = clip_offset(clip, fb->pitches[0], cpp);
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size_t len = (clip->x2 - clip->x1) * cpp;
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unsigned int y, lines = clip->y2 - clip->y1;
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vaddr += offset;
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dst += offset;
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for (y = 0; y < lines; y++) {
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memcpy_toio(dst, vaddr, len);
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vaddr += fb->pitches[0];
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dst += fb->pitches[0];
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}
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}
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EXPORT_SYMBOL(drm_fb_memcpy_dstclip);
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/**
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* drm_fb_swab16 - Swap bytes into clip buffer
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* @dst: RGB565 destination buffer
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* @vaddr: RGB565 source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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*/
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void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
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struct drm_rect *clip)
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{
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size_t len = (clip->x2 - clip->x1) * sizeof(u16);
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unsigned int x, y;
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u16 *src, *buf;
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/*
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* The cma memory is write-combined so reads are uncached.
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* Speed up by fetching one line at a time.
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*/
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buf = kmalloc(len, GFP_KERNEL);
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if (!buf)
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return;
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for (y = clip->y1; y < clip->y2; y++) {
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src = vaddr + (y * fb->pitches[0]);
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src += clip->x1;
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memcpy(buf, src, len);
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src = buf;
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for (x = clip->x1; x < clip->x2; x++)
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*dst++ = swab16(*src++);
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}
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kfree(buf);
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}
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EXPORT_SYMBOL(drm_fb_swab16);
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static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf,
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unsigned int pixels,
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bool swab)
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{
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unsigned int x;
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u16 val16;
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for (x = 0; x < pixels; x++) {
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val16 = ((sbuf[x] & 0x00F80000) >> 8) |
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((sbuf[x] & 0x0000FC00) >> 5) |
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((sbuf[x] & 0x000000F8) >> 3);
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if (swab)
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dbuf[x] = swab16(val16);
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else
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dbuf[x] = val16;
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}
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}
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/**
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* drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
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* @dst: RGB565 destination buffer
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* @vaddr: XRGB8888 source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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* @swab: Swap bytes
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*
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* Drivers can use this function for RGB565 devices that don't natively
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* support XRGB8888.
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*
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* This function does not apply clipping on dst, i.e. the destination
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* is a small buffer containing the clip rect only.
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*/
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void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
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struct drm_framebuffer *fb,
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struct drm_rect *clip, bool swab)
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{
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size_t linepixels = clip->x2 - clip->x1;
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size_t src_len = linepixels * sizeof(u32);
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size_t dst_len = linepixels * sizeof(u16);
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unsigned y, lines = clip->y2 - clip->y1;
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void *sbuf;
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/*
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* The cma memory is write-combined so reads are uncached.
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* Speed up by fetching one line at a time.
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*/
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sbuf = kmalloc(src_len, GFP_KERNEL);
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if (!sbuf)
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return;
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vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
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for (y = 0; y < lines; y++) {
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memcpy(sbuf, vaddr, src_len);
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drm_fb_xrgb8888_to_rgb565_line(dst, sbuf, linepixels, swab);
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vaddr += fb->pitches[0];
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dst += dst_len;
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}
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kfree(sbuf);
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}
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EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
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/**
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* drm_fb_xrgb8888_to_rgb565_dstclip - Convert XRGB8888 to RGB565 clip buffer
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* @dst: RGB565 destination buffer (iomem)
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* @dst_pitch: destination buffer pitch
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* @vaddr: XRGB8888 source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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* @swab: Swap bytes
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*
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* Drivers can use this function for RGB565 devices that don't natively
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* support XRGB8888.
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*
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* This function applies clipping on dst, i.e. the destination is a
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* full (iomem) framebuffer but only the clip rect content is copied over.
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*/
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void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
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void *vaddr, struct drm_framebuffer *fb,
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struct drm_rect *clip, bool swab)
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{
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size_t linepixels = clip->x2 - clip->x1;
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size_t dst_len = linepixels * sizeof(u16);
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unsigned y, lines = clip->y2 - clip->y1;
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void *dbuf;
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dbuf = kmalloc(dst_len, GFP_KERNEL);
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if (!dbuf)
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return;
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vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
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dst += clip_offset(clip, dst_pitch, sizeof(u16));
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for (y = 0; y < lines; y++) {
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drm_fb_xrgb8888_to_rgb565_line(dbuf, vaddr, linepixels, swab);
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memcpy_toio(dst, dbuf, dst_len);
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vaddr += fb->pitches[0];
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dst += dst_len;
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}
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kfree(dbuf);
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}
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EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);
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static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, u32 *sbuf,
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unsigned int pixels)
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{
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unsigned int x;
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for (x = 0; x < pixels; x++) {
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*dbuf++ = (sbuf[x] & 0x000000FF) >> 0;
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*dbuf++ = (sbuf[x] & 0x0000FF00) >> 8;
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*dbuf++ = (sbuf[x] & 0x00FF0000) >> 16;
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}
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}
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/**
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* drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
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* @dst: RGB565 destination buffer (iomem)
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* @dst_pitch: destination buffer pitch
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* @vaddr: XRGB8888 source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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*
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* Drivers can use this function for RGB888 devices that don't natively
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* support XRGB8888.
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*
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* This function applies clipping on dst, i.e. the destination is a
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* full (iomem) framebuffer but only the clip rect content is copied over.
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*/
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void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch,
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void *vaddr, struct drm_framebuffer *fb,
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struct drm_rect *clip)
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{
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size_t linepixels = clip->x2 - clip->x1;
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size_t dst_len = linepixels * 3;
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unsigned y, lines = clip->y2 - clip->y1;
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void *dbuf;
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dbuf = kmalloc(dst_len, GFP_KERNEL);
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if (!dbuf)
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return;
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vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
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dst += clip_offset(clip, dst_pitch, sizeof(u16));
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for (y = 0; y < lines; y++) {
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drm_fb_xrgb8888_to_rgb888_line(dbuf, vaddr, linepixels);
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memcpy_toio(dst, dbuf, dst_len);
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vaddr += fb->pitches[0];
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dst += dst_len;
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}
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kfree(dbuf);
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}
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EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip);
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/**
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* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
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* @dst: 8-bit grayscale destination buffer
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* @vaddr: XRGB8888 source buffer
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* @fb: DRM framebuffer
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* @clip: Clip rectangle area to copy
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*
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* Drm doesn't have native monochrome or grayscale support.
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* Such drivers can announce the commonly supported XR24 format to userspace
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* and use this function to convert to the native format.
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*
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* Monochrome drivers will use the most significant bit,
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* where 1 means foreground color and 0 background color.
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*
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* ITU BT.601 is used for the RGB -> luma (brightness) conversion.
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*/
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void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
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struct drm_rect *clip)
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{
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unsigned int len = (clip->x2 - clip->x1) * sizeof(u32);
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unsigned int x, y;
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void *buf;
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u32 *src;
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if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))
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return;
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/*
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* The cma memory is write-combined so reads are uncached.
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* Speed up by fetching one line at a time.
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*/
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buf = kmalloc(len, GFP_KERNEL);
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if (!buf)
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return;
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for (y = clip->y1; y < clip->y2; y++) {
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src = vaddr + (y * fb->pitches[0]);
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src += clip->x1;
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memcpy(buf, src, len);
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src = buf;
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for (x = clip->x1; x < clip->x2; x++) {
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u8 r = (*src & 0x00ff0000) >> 16;
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u8 g = (*src & 0x0000ff00) >> 8;
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u8 b = *src & 0x000000ff;
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/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
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*dst++ = (3 * r + 6 * g + b) / 10;
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src++;
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}
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}
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kfree(buf);
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}
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EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
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