Mesa (master): util: (Almost) universal format translation function.
Jose Fonseca
jrfonseca at kemper.freedesktop.org
Thu Apr 8 18:04:21 UTC 2010
Module: Mesa
Branch: master
Commit: 89ceb2f3c761d7287f5e2dca84d43dc16f400da0
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=89ceb2f3c761d7287f5e2dca84d43dc16f400da0
Author: José Fonseca <jfonseca at vmware.com>
Date: Thu Apr 8 19:03:05 2010 +0100
util: (Almost) universal format translation function.
Untested.
---
src/gallium/auxiliary/util/u_format.c | 167 +++++++++++++++++++++++++++++++++
src/gallium/auxiliary/util/u_format.h | 13 +++
2 files changed, 180 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index 7f16cf7..418b354 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -32,6 +32,9 @@
* @author Jose Fonseca <jfonseca at vmware.com>
*/
+#include "u_math.h"
+#include "u_memory.h"
+#include "u_rect.h"
#include "u_format.h"
@@ -116,3 +119,167 @@ util_format_write_4ub(enum pipe_format format, const uint8_t *src, unsigned src_
format_desc->pack_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
}
+
+static INLINE boolean
+util_format_fits_8unorm(const struct util_format_description *format_desc)
+{
+ unsigned chan;
+
+ switch (format_desc->layout) {
+
+ case UTIL_FORMAT_LAYOUT_S3TC:
+ case UTIL_FORMAT_LAYOUT_RGTC:
+ /*
+ * These are straight forward.
+ */
+
+ return TRUE;
+
+ case UTIL_FORMAT_LAYOUT_PLAIN:
+ /*
+ * For these we can find a generic rule.
+ */
+
+ for (chan = 0; chan < format_desc->nr_channels; ++chan) {
+ switch (format_desc->channel[chan].type) {
+ case UTIL_FORMAT_TYPE_VOID:
+ break;
+ case UTIL_FORMAT_TYPE_UNSIGNED:
+ if (!format_desc->channel[chan].normalized ||
+ format_desc->channel[chan].size > 8) {
+ return FALSE;
+ }
+ default:
+ return FALSE;
+ }
+ }
+ return TRUE;
+
+ default:
+ /*
+ * Handle all others on a case by case basis.
+ */
+
+ switch (format_desc->format) {
+ case PIPE_FORMAT_R1_UNORM:
+ case PIPE_FORMAT_UYVY:
+ case PIPE_FORMAT_YUYV:
+ case PIPE_FORMAT_R8G8_B8G8_UNORM:
+ case PIPE_FORMAT_G8R8_G8B8_UNORM:
+ return TRUE;
+
+ default:
+ return FALSE;
+ }
+ }
+}
+
+
+void
+util_format_translate(enum pipe_format dst_format,
+ void *dst, unsigned dst_stride,
+ unsigned dst_x, unsigned dst_y,
+ enum pipe_format src_format,
+ const void *src, unsigned src_stride,
+ unsigned src_x, unsigned src_y,
+ unsigned width, unsigned height)
+{
+ const struct util_format_description *dst_format_desc;
+ const struct util_format_description *src_format_desc;
+ uint8_t *dst_row;
+ const uint8_t *src_row;
+ unsigned y_step;
+ unsigned dst_step;
+ unsigned src_step;
+
+ if (dst_format == src_format) {
+ /*
+ * Trivial case.
+ */
+
+ util_copy_rect(dst, dst_format, dst_stride, dst_x, dst_y,
+ width, height, src, (int)src_stride,
+ src_x, src_y);
+ return;
+ }
+
+ dst_format_desc = util_format_description(dst_format);
+ src_format_desc = util_format_description(src_format);
+
+ assert(dst_x % dst_format_desc->block.width == 0);
+ assert(dst_y % dst_format_desc->block.height == 0);
+ assert(src_x % src_format_desc->block.width == 0);
+ assert(src_y % src_format_desc->block.height == 0);
+
+ dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
+ src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
+
+ /*
+ * This works because all pixel formats have pixel blocks with power of two
+ * sizes.
+ */
+
+ y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
+ assert(y_step % dst_format_desc->block.height == 0);
+ assert(y_step % src_format_desc->block.height == 0);
+
+ dst_step = y_step / dst_format_desc->block.height * dst_stride;
+ src_step = y_step / src_format_desc->block.height * src_stride;
+
+ /*
+ * TODO: double formats will loose precision
+ * TODO: Add a special case for formats that are mere swizzles of each other
+ */
+
+ if (util_format_fits_8unorm(src_format_desc) ||
+ util_format_fits_8unorm(dst_format_desc)) {
+ unsigned tmp_stride;
+ uint8_t *tmp_row;
+
+ tmp_stride = width * 4 * sizeof *tmp_row;
+ tmp_row = MALLOC(y_step * tmp_stride);
+ if (!tmp_row)
+ return;
+
+ while (height >= y_step) {
+ src_format_desc->unpack_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
+ dst_format_desc->pack_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
+
+ dst_row += dst_step;
+ src_row += src_step;
+ height -= y_step;
+ }
+
+ if (height) {
+ src_format_desc->unpack_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
+ dst_format_desc->pack_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
+ }
+
+ FREE(tmp_row);
+ }
+ else {
+ unsigned tmp_stride;
+ float *tmp_row;
+
+ tmp_stride = width * 4 * sizeof *tmp_row;
+ tmp_row = MALLOC(y_step * tmp_stride);
+ if (!tmp_row)
+ return;
+
+ while (height >= y_step) {
+ src_format_desc->unpack_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
+ dst_format_desc->pack_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
+
+ dst_row += dst_step;
+ src_row += src_step;
+ height -= y_step;
+ }
+
+ if (height) {
+ src_format_desc->unpack_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
+ dst_format_desc->pack_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
+ }
+
+ FREE(tmp_row);
+ }
+}
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 93818a3..a7c24f0 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -530,6 +530,19 @@ util_format_write_4ub(enum pipe_format format,
void *dst, unsigned dst_stride,
unsigned x, unsigned y, unsigned w, unsigned h);
+/*
+ * Generic format conversion;
+ */
+
+void
+util_format_translate(enum pipe_format dst_format,
+ void *dst, unsigned dst_stride,
+ unsigned dst_x, unsigned dst_y,
+ enum pipe_format src_format,
+ const void *src, unsigned src_stride,
+ unsigned src_x, unsigned src_y,
+ unsigned width, unsigned height);
+
#ifdef __cplusplus
} // extern "C" {
#endif
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