[PATCH v3 1/4] drm: Add struct drm_rect and assorted utility functions
ville.syrjala at linux.intel.com
ville.syrjala at linux.intel.com
Wed Mar 27 08:46:22 PDT 2013
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
struct drm_rect represents a simple rectangle. The utility
functions are there to help driver writers.
v2: Moved the region stuff into its own file, made the smaller funcs
static inline, used 64bit maths in the scaled clipping function to
avoid overflows (instead it will saturate to INT_MIN or INT_MAX).
v3: Renamed drm_region to drm_rect, drm_region_clip to
drm_rect_intersect, and drm_region_subsample to drm_rect_downscale.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/drm_rect.c | 96 +++++++++++++++++++++++++++++++++
include/drm/drm_rect.h | 132 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 230 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/drm_rect.c
create mode 100644 include/drm/drm_rect.h
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 0d59b24..8f94018 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -12,7 +12,8 @@ drm-y := drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
drm_platform.o drm_sysfs.o drm_hashtab.o drm_mm.o \
drm_crtc.o drm_modes.o drm_edid.o \
drm_info.o drm_debugfs.o drm_encoder_slave.o \
- drm_trace_points.o drm_global.o drm_prime.o
+ drm_trace_points.o drm_global.o drm_prime.o \
+ drm_rect.o
drm-$(CONFIG_COMPAT) += drm_ioc32.o
drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c
new file mode 100644
index 0000000..1ad4f5e
--- /dev/null
+++ b/drivers/gpu/drm/drm_rect.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2011-2013 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <drm/drm_rect.h>
+
+/**
+ * drm_rect_intersect - intersect two rectangles
+ * @r1: first rectangle
+ * @r2: second rectangle
+ *
+ * Calculate the intersection of rectangles @r1 and @r2.
+ * @r1 will be overwritten with the intersection.
+ *
+ * RETURNS:
+ * @true if rectangle @r1 is still visible after the operation,
+ * @false otherwise.
+ */
+bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2)
+{
+ r1->x1 = max(r1->x1, r2->x1);
+ r1->y1 = max(r1->y1, r2->y1);
+ r1->x2 = min(r1->x2, r2->x2);
+ r1->y2 = min(r1->y2, r2->y2);
+
+ return drm_rect_visible(r1);
+}
+EXPORT_SYMBOL(drm_rect_intersect);
+
+/**
+ * drm_rect_clip_scaled - perform a scaled clip operation
+ * @src: source window rectangle
+ * @dst: destination window rectangle
+ * @clip: clip rectangle
+ * @hscale: horizontal scaling factor
+ * @vscale: vertical scaling factor
+ *
+ * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the
+ * same amounts multiplied by @hscale and @vscale.
+ *
+ * RETUTRNS:
+ * @true if rectangle @dst is still visible after being clipped,
+ * @false otherwise
+ */
+bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
+ const struct drm_rect *clip,
+ int hscale, int vscale)
+{
+ int diff;
+
+ diff = clip->x1 - dst->x1;
+ if (diff > 0) {
+ int64_t tmp = src->x1 + (int64_t) diff * hscale;
+ src->x1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
+ }
+ diff = clip->y1 - dst->y1;
+ if (diff > 0) {
+ int64_t tmp = src->y1 + (int64_t) diff * vscale;
+ src->y1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
+ }
+ diff = dst->x2 - clip->x2;
+ if (diff > 0) {
+ int64_t tmp = src->x2 - (int64_t) diff * hscale;
+ src->x2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
+ }
+ diff = dst->y2 - clip->y2;
+ if (diff > 0) {
+ int64_t tmp = src->y2 - (int64_t) diff * vscale;
+ src->y2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
+ }
+
+ return drm_rect_intersect(dst, clip);
+}
+EXPORT_SYMBOL(drm_rect_clip_scaled);
diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
new file mode 100644
index 0000000..40b09a4
--- /dev/null
+++ b/include/drm/drm_rect.h
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2011-2013 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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.
+ */
+
+#ifndef DRM_RECT_H
+#define DRM_RECT_H
+
+/**
+ * drm_rect - two dimensional rect
+ * @x1: horizontal starting coordinate (inclusive)
+ * @x2: horizontal ending coordinate (exclusive)
+ * @y1: vertical starting coordinate (inclusive)
+ * @y2: vertical ending coordinate (exclusive)
+ */
+struct drm_rect {
+ int x1, y1, x2, y2;
+};
+
+/**
+ * drm_rect_adjust_size - adjust the size of the rect
+ * @r: rect to be adjusted
+ * @x: horizontal adjustment
+ * @y: vertical adjustment
+ *
+ * Change the size of rect @r by @x in the horizontal direction,
+ * and by @y in the vertical direction, while keeping the center
+ * of @r stationary.
+ *
+ * Positive @x and @y increase the size, negative values decrease it.
+ */
+static inline void drm_rect_adjust_size(struct drm_rect *r, int x, int y)
+{
+ r->x1 -= x >> 1;
+ r->y1 -= y >> 1;
+ r->x2 += (x + 1) >> 1;
+ r->y2 += (y + 1) >> 1;
+}
+
+/**
+ * drm_rect_translate - translate the rect
+ * @r: rect to be tranlated
+ * @x: horizontal translation
+ * @y: vertical translation
+ *
+ * Move rect @r by @x in the horizontal direction,
+ * and by @y in the vertical direction.
+ */
+static inline void drm_rect_translate(struct drm_rect *r, int x, int y)
+{
+ r->x1 += x;
+ r->y1 += y;
+ r->x2 += x;
+ r->y2 += y;
+}
+
+/**
+ * drm_rect_downscale - downscale a rect
+ * @r: rect to be downscaled
+ * @horz: horizontal downscale factor
+ * @vert: vertical downscale factor
+ *
+ * Divide the coordinates of rect @r by @horz and @vert.
+ */
+static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
+{
+ r->x1 /= horz;
+ r->y1 /= vert;
+ r->x2 /= horz;
+ r->y2 /= vert;
+}
+
+/**
+ * drm_rect_width - determine the rect width
+ * @r: rect whose width is returned
+ *
+ * RETURNS:
+ * The width of the rect.
+ */
+static inline int drm_rect_width(const struct drm_rect *r)
+{
+ return r->x2 - r->x1;
+}
+
+/**
+ * drm_rect_height - determine the rect height
+ * @r: rect whose height is returned
+ *
+ * RETURNS:
+ * The height of the rect.
+ */
+static inline int drm_rect_height(const struct drm_rect *r)
+{
+ return r->y2 - r->y1;
+}
+
+/**
+ * drm_rect_visible - determine if the the rect is visible
+ * @r: rect whose visibility is returned
+ *
+ * RETURNS:
+ * @true if the rect is visible, @false otherwise.
+ */
+static inline bool drm_rect_visible(const struct drm_rect *r)
+{
+ return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
+}
+
+bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
+bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
+ const struct drm_rect *clip,
+ int hscale, int vscale);
+
+#endif
--
1.8.1.5
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