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-rw-r--r--com32/lib/sys/vesa/fmtpixel.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/com32/lib/sys/vesa/fmtpixel.c b/com32/lib/sys/vesa/fmtpixel.c
new file mode 100644
index 00000000..74c79ef1
--- /dev/null
+++ b/com32/lib/sys/vesa/fmtpixel.c
@@ -0,0 +1,101 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2006-2008 H. Peter Anvin - All Rights Reserved
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall
+ * be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * fmtpixel.c
+ *
+ * Functions to format a single pixel
+ */
+
+#include <inttypes.h>
+#include "video.h"
+
+/* Format a pixel and return the advanced pointer.
+ THIS FUNCTION IS ALLOWED TO WRITE BEYOND THE END OF THE PIXEL. */
+
+static inline uint32_t *copy_dword(uint32_t *dst, const uint32_t *src,
+ size_t dword_count)
+{
+ asm volatile("cld; rep; movsl"
+ : "+D" (dst), "+S" (src), "+c" (dword_count));
+ return dst; /* Updated destination pointer */
+}
+
+static void *format_pxf_bgra32(void *ptr, const uint32_t *p, size_t n)
+{
+ return copy_dword(ptr, p, n);
+}
+
+static void *format_pxf_bgr24(void *ptr, const uint32_t *p, size_t n)
+{
+ char *q = ptr;
+
+ while (n--) {
+ *(uint32_t *)q = *p++;
+ q += 3;
+ }
+ return q;
+}
+
+static void *format_pxf_le_rgb16_565(void *ptr, const uint32_t *p, size_t n)
+{
+ uint32_t bgra;
+ uint16_t *q = ptr;
+
+ while (n--) {
+ bgra = *p++;
+ *q++ =
+ ((bgra >> 3) & 0x1f) +
+ ((bgra >> (2+8-5)) & (0x3f << 5)) +
+ ((bgra >> (3+16-11)) & (0x1f << 11));
+ }
+ return q;
+}
+
+static void *format_pxf_le_rgb15_555(void *ptr, const uint32_t *p, size_t n)
+{
+ uint32_t bgra;
+ uint16_t *q = ptr;
+
+ while (n--) {
+ bgra = *p++;
+ *q++ =
+ ((bgra >> 3) & 0x1f) +
+ ((bgra >> (2+8-5)) & (0x1f << 5)) +
+ ((bgra >> (3+16-10)) & (0x1f << 10));
+ }
+ return q;
+}
+
+__vesacon_format_pixels_t __vesacon_format_pixels;
+
+const __vesacon_format_pixels_t __vesacon_format_pixels_list[PXF_NONE] = {
+ [PXF_BGRA32] = format_pxf_bgra32,
+ [PXF_BGR24] = format_pxf_bgr24,
+ [PXF_LE_RGB16_565] = format_pxf_le_rgb16_565,
+ [PXF_LE_RGB15_555] = format_pxf_le_rgb15_555,
+};