diff mbox series

[RFC,05/12] Deduplicate cfb/sys drawing fbops

Message ID f1f041ad-3670-029e-7914-651729ea5062@c64.rulez.org (mailing list archive)
State New
Headers show
Series Deduplicate cfb/sys drawing fbops | expand

Commit Message

Kajtár Zsolt Feb. 2, 2025, 12:43 p.m. UTC 
fbdev: core: Copy cfbfillrect to fb_fillrect

Signed-off-by: Zsolt Kajtar <soci@c64.rulez.org>
---
 drivers/video/fbdev/core/fb_fillrect.h | 374 +++++++++++++++++++++++++
 1 file changed, 374 insertions(+)
 create mode 100644 drivers/video/fbdev/core/fb_fillrect.h
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Patch

diff --git a/drivers/video/fbdev/core/fb_fillrect.h b/drivers/video/fbdev/core/fb_fillrect.h
new file mode 100644
index 000000000..cbaa4c9e2
--- /dev/null
+++ b/drivers/video/fbdev/core/fb_fillrect.h
@@ -0,0 +1,374 @@ 
+/*
+ *  Generic fillrect for frame buffers with packed pixels of any depth.
+ *
+ *      Copyright (C)  2000 James Simmons (jsimmons@linux-fbdev.org)
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive for
+ *  more details.
+ *
+ * NOTES:
+ *
+ *  Also need to add code to deal with cards endians that are different than
+ *  the native cpu endians. I also need to deal with MSB position in the word.
+ *
+ */
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <asm/types.h>
+#include "fb_draw.h"
+
+#if BITS_PER_LONG == 32
+#  define FB_WRITEL fb_writel
+#  define FB_READL  fb_readl
+#else
+#  define FB_WRITEL fb_writeq
+#  define FB_READL  fb_readq
+#endif
+
+    /*
+     *  Aligned pattern fill using 32/64-bit memory accesses
+     */
+
+static void
+bitfill_aligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
+		unsigned long pat, unsigned n, int bits, u32 bswapmask)
+{
+	unsigned long first, last;
+
+	if (!n)
+		return;
+
+	first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
+	last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
+
+	if (dst_idx+n <= bits) {
+		// Single word
+		if (last)
+			first &= last;
+		FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
+	} else {
+		// Multiple destination words
+
+		// Leading bits
+		if (first!= ~0UL) {
+			FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
+			dst++;
+			n -= bits - dst_idx;
+		}
+
+		// Main chunk
+		n /= bits;
+		while (n >= 8) {
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			FB_WRITEL(pat, dst++);
+			n -= 8;
+		}
+		while (n--)
+			FB_WRITEL(pat, dst++);
+
+		// Trailing bits
+		if (last)
+			FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
+	}
+}
+
+
+    /*
+     *  Unaligned generic pattern fill using 32/64-bit memory accesses
+     *  The pattern must have been expanded to a full 32/64-bit value
+     *  Left/right are the appropriate shifts to convert to the pattern to be
+     *  used for the next 32/64-bit word
+     */
+
+static void
+bitfill_unaligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
+		  unsigned long pat, int left, int right, unsigned n, int bits)
+{
+	unsigned long first, last;
+
+	if (!n)
+		return;
+
+	first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
+	last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
+
+	if (dst_idx+n <= bits) {
+		// Single word
+		if (last)
+			first &= last;
+		FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
+	} else {
+		// Multiple destination words
+		// Leading bits
+		if (first) {
+			FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
+			dst++;
+			pat = pat << left | pat >> right;
+			n -= bits - dst_idx;
+		}
+
+		// Main chunk
+		n /= bits;
+		while (n >= 4) {
+			FB_WRITEL(pat, dst++);
+			pat = pat << left | pat >> right;
+			FB_WRITEL(pat, dst++);
+			pat = pat << left | pat >> right;
+			FB_WRITEL(pat, dst++);
+			pat = pat << left | pat >> right;
+			FB_WRITEL(pat, dst++);
+			pat = pat << left | pat >> right;
+			n -= 4;
+		}
+		while (n--) {
+			FB_WRITEL(pat, dst++);
+			pat = pat << left | pat >> right;
+		}
+
+		// Trailing bits
+		if (last)
+			FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
+	}
+}
+
+    /*
+     *  Aligned pattern invert using 32/64-bit memory accesses
+     */
+static void
+bitfill_aligned_rev(struct fb_info *p, unsigned long __iomem *dst,
+		    int dst_idx, unsigned long pat, unsigned n, int bits,
+		    u32 bswapmask)
+{
+	unsigned long val = pat, dat;
+	unsigned long first, last;
+
+	if (!n)
+		return;
+
+	first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
+	last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
+
+	if (dst_idx+n <= bits) {
+		// Single word
+		if (last)
+			first &= last;
+		dat = FB_READL(dst);
+		FB_WRITEL(comp(dat ^ val, dat, first), dst);
+	} else {
+		// Multiple destination words
+		// Leading bits
+		if (first!=0UL) {
+			dat = FB_READL(dst);
+			FB_WRITEL(comp(dat ^ val, dat, first), dst);
+			dst++;
+			n -= bits - dst_idx;
+		}
+
+		// Main chunk
+		n /= bits;
+		while (n >= 8) {
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+			n -= 8;
+		}
+		while (n--) {
+			FB_WRITEL(FB_READL(dst) ^ val, dst);
+			dst++;
+		}
+		// Trailing bits
+		if (last) {
+			dat = FB_READL(dst);
+			FB_WRITEL(comp(dat ^ val, dat, last), dst);
+		}
+	}
+}
+
+
+    /*
+     *  Unaligned generic pattern invert using 32/64-bit memory accesses
+     *  The pattern must have been expanded to a full 32/64-bit value
+     *  Left/right are the appropriate shifts to convert to the pattern to be
+     *  used for the next 32/64-bit word
+     */
+
+static void
+bitfill_unaligned_rev(struct fb_info *p, unsigned long __iomem *dst,
+		      int dst_idx, unsigned long pat, int left, int right,
+		      unsigned n, int bits)
+{
+	unsigned long first, last, dat;
+
+	if (!n)
+		return;
+
+	first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
+	last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
+
+	if (dst_idx+n <= bits) {
+		// Single word
+		if (last)
+			first &= last;
+		dat = FB_READL(dst);
+		FB_WRITEL(comp(dat ^ pat, dat, first), dst);
+	} else {
+		// Multiple destination words
+
+		// Leading bits
+		if (first != 0UL) {
+			dat = FB_READL(dst);
+			FB_WRITEL(comp(dat ^ pat, dat, first), dst);
+			dst++;
+			pat = pat << left | pat >> right;
+			n -= bits - dst_idx;
+		}
+
+		// Main chunk
+		n /= bits;
+		while (n >= 4) {
+			FB_WRITEL(FB_READL(dst) ^ pat, dst);
+			dst++;
+			pat = pat << left | pat >> right;
+			FB_WRITEL(FB_READL(dst) ^ pat, dst);
+			dst++;
+			pat = pat << left | pat >> right;
+			FB_WRITEL(FB_READL(dst) ^ pat, dst);
+			dst++;
+			pat = pat << left | pat >> right;
+			FB_WRITEL(FB_READL(dst) ^ pat, dst);
+			dst++;
+			pat = pat << left | pat >> right;
+			n -= 4;
+		}
+		while (n--) {
+			FB_WRITEL(FB_READL(dst) ^ pat, dst);
+			dst++;
+			pat = pat << left | pat >> right;
+		}
+
+		// Trailing bits
+		if (last) {
+			dat = FB_READL(dst);
+			FB_WRITEL(comp(dat ^ pat, dat, last), dst);
+		}
+	}
+}
+
+void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
+{
+	unsigned long pat, pat2, fg;
+	unsigned long width = rect->width, height = rect->height;
+	int bits = BITS_PER_LONG, bytes = bits >> 3;
+	u32 bpp = p->var.bits_per_pixel;
+	unsigned long __iomem *dst;
+	int dst_idx, left;
+
+	if (p->state != FBINFO_STATE_RUNNING)
+		return;
+
+	if (p->flags & FBINFO_VIRTFB)
+		fb_warn_once(p, "Framebuffer is not in I/O address space.");
+
+	if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
+	    p->fix.visual == FB_VISUAL_DIRECTCOLOR )
+		fg = ((u32 *) (p->pseudo_palette))[rect->color];
+	else
+		fg = rect->color;
+
+	pat = pixel_to_pat(bpp, fg);
+
+	dst = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
+	dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
+	dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
+	/* FIXME For now we support 1-32 bpp only */
+	left = bits % bpp;
+	if (p->fbops->fb_sync)
+		p->fbops->fb_sync(p);
+	if (!left) {
+		u32 bswapmask = fb_compute_bswapmask(p);
+		void (*fill_op32)(struct fb_info *p,
+				  unsigned long __iomem *dst, int dst_idx,
+		                  unsigned long pat, unsigned n, int bits,
+				  u32 bswapmask) = NULL;
+
+		switch (rect->rop) {
+		case ROP_XOR:
+			fill_op32 = bitfill_aligned_rev;
+			break;
+		case ROP_COPY:
+			fill_op32 = bitfill_aligned;
+			break;
+		default:
+			printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
+			fill_op32 = bitfill_aligned;
+			break;
+		}
+		while (height--) {
+			dst += dst_idx >> (ffs(bits) - 1);
+			dst_idx &= (bits - 1);
+			fill_op32(p, dst, dst_idx, pat, width*bpp, bits,
+				  bswapmask);
+			dst_idx += p->fix.line_length*8;
+		}
+	} else {
+		int right, r;
+		void (*fill_op)(struct fb_info *p, unsigned long __iomem *dst,
+				int dst_idx, unsigned long pat, int left,
+				int right, unsigned n, int bits) = NULL;
+#ifdef __LITTLE_ENDIAN
+		right = left;
+		left = bpp - right;
+#else
+		right = bpp - left;
+#endif
+		switch (rect->rop) {
+		case ROP_XOR:
+			fill_op = bitfill_unaligned_rev;
+			break;
+		case ROP_COPY:
+			fill_op = bitfill_unaligned;
+			break;
+		default:
+			printk(KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
+			fill_op = bitfill_unaligned;
+			break;
+		}
+		while (height--) {
+			dst += dst_idx / bits;
+			dst_idx &= (bits - 1);
+			r = dst_idx % bpp;
+			/* rotate pattern to the correct start position */
+			pat2 = le_long_to_cpu(rolx(cpu_to_le_long(pat), r, bpp));
+			fill_op(p, dst, dst_idx, pat2, left, right,
+				width*bpp, bits);
+			dst_idx += p->fix.line_length*8;
+		}
+	}
+}
+
+EXPORT_SYMBOL(cfb_fillrect);
+
+MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
+MODULE_DESCRIPTION("Generic software accelerated fill rectangle");
+MODULE_LICENSE("GPL");