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From fc24a2d8d0039cd10de4175da40bb784e2c3bf49 Mon Sep 17 00:00:00 2001
From: Siarhei Siamashka <siarhei.siamashka@nokia.com>
Date: Fri, 4 Dec 2009 16:49:19 +0000
Subject: [PATCH 6/7] A copy-paste version of 16bpp bilinear scanline fetcher
---
pixman/pixman-bits-image.c | 228 +++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 223 insertions(+), 5 deletions(-)
diff --git a/pixman/pixman-bits-image.c b/pixman/pixman-bits-image.c
index 3d78ff0..1656975 100644
--- a/pixman/pixman-bits-image.c
+++ b/pixman/pixman-bits-image.c
@@ -535,6 +535,212 @@ bits_image_fetch_bilinear_no_repeat_8888 (pixman_image_t * ima,
*buffer++ = 0;
}
+static void
+bits_image_fetch_bilinear_no_repeat_0565 (pixman_image_t * ima,
+ int offset,
+ int line,
+ int width,
+ uint32_t * buffer,
+ const uint32_t * mask,
+ uint32_t mask_bits)
+{
+ bits_image_t *bits = &ima->bits;
+ pixman_fixed_t x_top, x_bottom, x;
+ pixman_fixed_t ux_top, ux_bottom, ux;
+ pixman_vector_t v;
+ uint32_t top_mask, bottom_mask;
+ uint16_t *top_row;
+ uint16_t *bottom_row;
+ uint32_t *end;
+ uint16_t zero[2] = { 0, 0 };
+ int y, y1, y2;
+ int disty;
+ int mask_inc;
+ int w;
+
+ /* reference point is the center of the pixel */
+ v.vector[0] = pixman_int_to_fixed (offset) + pixman_fixed_1 / 2;
+ v.vector[1] = pixman_int_to_fixed (line) + pixman_fixed_1 / 2;
+ v.vector[2] = pixman_fixed_1;
+
+ if (!pixman_transform_point_3d (bits->common.transform, &v))
+ return;
+
+ ux = ux_top = ux_bottom = bits->common.transform->matrix[0][0];
+ x = x_top = x_bottom = v.vector[0] - pixman_fixed_1/2;
+
+ y = v.vector[1] - pixman_fixed_1/2;
+ disty = (y >> 8) & 0xff;
+
+ /* Load the pointers to the first and second lines from the source
+ * image that bilinear code must read.
+ *
+ * The main trick in this code is about the check if any line are
+ * outside of the image;
+ *
+ * When I realize that a line (any one) is outside, I change
+ * the pointer to a dummy area with zeros. Once I change this, I
+ * must be sure the pointer will not change, so I set the
+ * variables to each pointer increments inside the loop.
+ */
+ y1 = pixman_fixed_to_int (y);
+ y2 = y1 + 1;
+
+ if (y1 < 0 || y1 >= bits->height)
+ {
+ top_row = zero;
+ x_top = 0;
+ ux_top = 0;
+ }
+ else
+ {
+ top_row = bits->bits + y1 * bits->rowstride;
+ x_top = x;
+ ux_top = ux;
+ }
+
+ if (y2 < 0 || y2 >= bits->height)
+ {
+ bottom_row = zero;
+ x_bottom = 0;
+ ux_bottom = 0;
+ }
+ else
+ {
+ bottom_row = bits->bits + y2 * bits->rowstride;
+ x_bottom = x;
+ ux_bottom = ux;
+ }
+
+ /* Instead of checking whether the operation uses the mast in
+ * each loop iteration, verify this only once and prepare the
+ * variables to make the code smaller inside the loop.
+ */
+ if (!mask)
+ {
+ mask_inc = 0;
+ mask_bits = 1;
+ mask = &mask_bits;
+ }
+ else
+ {
+ /* If have a mask, prepare the variables to check it */
+ mask_inc = 1;
+ }
+
+ /* If both are zero, then the whole thing is zero */
+ if (top_row == zero && bottom_row == zero)
+ {
+ memset (buffer, 0, width * sizeof (uint32_t));
+ return;
+ }
+ else
+ {
+ if (top_row == zero)
+ {
+ top_mask = 0;
+ bottom_mask = 0xff000000;
+ }
+ else if (bottom_row == zero)
+ {
+ top_mask = 0xff000000;
+ bottom_mask = 0;
+ }
+ else
+ {
+ top_mask = 0xff000000;
+ bottom_mask = 0xff000000;
+ }
+ }
+
+ end = buffer + width;
+
+ /* Zero fill to the left of the image */
+ while (buffer < end && x < pixman_fixed_minus_1)
+ {
+ *buffer++ = 0;
+ x += ux;
+ x_top += ux_top;
+ x_bottom += ux_bottom;
+ mask += mask_inc;
+ }
+
+ /* Left edge
+ */
+ while (buffer < end && x < 0)
+ {
+ uint32_t tr, br;
+ int32_t distx;
+
+ tr = CONVERT_0565_TO_0888 (top_row[pixman_fixed_to_int (x_top) + 1]) | top_mask;
+ br = CONVERT_0565_TO_0888 (bottom_row[pixman_fixed_to_int (x_bottom) + 1]) | bottom_mask;
+
+ distx = (x >> 8) & 0xff;
+
+ *buffer++ = bilinear_interpolation (0, tr, 0, br, distx, disty);
+
+ x += ux;
+ x_top += ux_top;
+ x_bottom += ux_bottom;
+ mask += mask_inc;
+ }
+
+ /* Main part */
+ w = pixman_int_to_fixed (bits->width - 1);
+
+ while (buffer < end && x < w)
+ {
+ if (*mask)
+ {
+ uint32_t tl, tr, bl, br;
+ int32_t distx;
+
+ tl = CONVERT_0565_TO_0888 (top_row [pixman_fixed_to_int (x_top)]) | top_mask;
+ tr = CONVERT_0565_TO_0888 (top_row [pixman_fixed_to_int (x_top) + 1]) | top_mask;
+ bl = CONVERT_0565_TO_0888 (bottom_row [pixman_fixed_to_int (x_bottom)]) | bottom_mask;
+ br = CONVERT_0565_TO_0888 (bottom_row [pixman_fixed_to_int (x_bottom) + 1]) | bottom_mask;
+
+ distx = (x >> 8) & 0xff;
+
+ *buffer = bilinear_interpolation (tl, tr, bl, br, distx, disty);
+ }
+
+ buffer++;
+ x += ux;
+ x_top += ux_top;
+ x_bottom += ux_bottom;
+ mask += mask_inc;
+ }
+
+ /* Right Edge */
+ w = pixman_int_to_fixed (bits->width);
+ while (buffer < end && x < w)
+ {
+ if (*mask)
+ {
+ uint32_t tl, bl;
+ int32_t distx;
+
+ tl = CONVERT_0565_TO_0888 (top_row [pixman_fixed_to_int (x_top)]) | top_mask;
+ bl = CONVERT_0565_TO_0888 (bottom_row [pixman_fixed_to_int (x_bottom)]) | bottom_mask;
+
+ distx = (x >> 8) & 0xff;
+
+ *buffer = bilinear_interpolation (tl, 0, bl, 0, distx, disty);
+ }
+
+ buffer++;
+ x += ux;
+ x_top += ux_top;
+ x_bottom += ux_bottom;
+ mask += mask_inc;
+ }
+
+ /* Zero fill to the left of the image */
+ while (buffer < end)
+ *buffer++ = 0;
+}
+
static force_inline uint32_t
bits_image_fetch_pixel_convolution (bits_image_t *image,
pixman_fixed_t x,
@@ -917,14 +1123,26 @@ bits_image_property_changed (pixman_image_t *image)
(bits->common.filter == PIXMAN_FILTER_BILINEAR ||
bits->common.filter == PIXMAN_FILTER_GOOD ||
bits->common.filter == PIXMAN_FILTER_BEST) &&
- bits->common.repeat == PIXMAN_REPEAT_NONE &&
- (bits->format == PIXMAN_a8r8g8b8 ||
- bits->format == PIXMAN_x8r8g8b8))
+ bits->common.repeat == PIXMAN_REPEAT_NONE)
{
image->common.get_scanline_64 =
_pixman_image_get_scanline_generic_64;
- image->common.get_scanline_32 =
- bits_image_fetch_bilinear_no_repeat_8888;
+
+ if (bits->format == PIXMAN_a8r8g8b8 || bits->format == PIXMAN_x8r8g8b8)
+ {
+ image->common.get_scanline_32 =
+ bits_image_fetch_bilinear_no_repeat_8888;
+ }
+ else if (bits->format == PIXMAN_r5g6b5)
+ {
+ image->common.get_scanline_32 =
+ bits_image_fetch_bilinear_no_repeat_0565;
+ }
+ else
+ {
+ image->common.get_scanline_32 =
+ bits_image_fetch_transformed;
+ }
}
else
{
--
1.6.6.1
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