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|
----------------------------------------------------------------------
--
--
-- Copyright (c) 2009-2010 Pierre Racine <pierre.racine@sbf.ulaval.ca>
--
----------------------------------------------------------------------
--NOTE: Both ST_SetValues functions found in this file are ready to be being implemented in C
--------------------------------------------------------------------
-- ST_SetValues - Set a range of raster pixels to a value.
--
-- Arguments
--
-- rast raster - Raster to be edited.
-- band integer - Band number of the raster to be edited. Default to 1.
-- x, y - Raster coordinates of the upper left corner of the range
-- of pixel to be edited.
-- width, height - Width and height of the range of pixel to be edited.
-- val - Value to set the range. If NULL, pixels are set to nodata.
-- keepdestnodata - Flag indicating not to change pixels set to nodata value.
-- Default to FALSE.
--
-- When x, y, width or height are out of the raster range, only the part
-- of the range intersecting with the raster is set.
--------------------------------------------------------------------
CREATE OR REPLACE FUNCTION ST_SetValues(rast raster, band int, x int, y int, width int, height int, val float8, keepdestnodata boolean)
RETURNS raster AS
$$
DECLARE
newraster raster := rast;
cx int;
cy int;
newwidth int := width;
newheight int := height;
newband int := band;
oldx int := x;
oldy int := y;
newx int;
newy int;
newval float8 := val;
newkeepdestnodata boolean := keepdestnodata;
rastnodataval int := 0;
BEGIN
IF rast IS NULL THEN
RAISE NOTICE 'ST_SetValues: No raster provided. Returns NULL';
RETURN NULL;
END IF;
IF ST_IsEmpty(rast) OR ST_HasNoBand(rast, band) THEN
RAISE NOTICE 'ST_SetValues: Empty or no band raster provided. Returns rast';
RETURN rast;
END IF;
IF newband IS NULL THEN
newband := 1;
END IF;
IF newband < 1 THEN
RAISE NOTICE 'ST_SetValues: band out of range. Returns rast';
RETURN rast;
END IF;
IF width IS NULL OR width < 1 OR height IS NULL OR height < 1 THEN
RAISE NOTICE 'ST_SetValues: invalid width or height. Returns rast';
RETURN rast;
END IF;
IF x IS NULL THEN
oldx := 1;
END IF;
newx := 1 + LEAST(GREATEST(0, oldx - 1), ST_Width(rast));
newwidth := GREATEST(LEAST(1 + ST_Width(rast), oldx + newwidth), 1) - newx;
IF y IS NULL THEN
oldy := 1;
END IF;
newy := 1 + LEAST(GREATEST(0, oldy - 1), ST_Height(rast));
newheight := GREATEST(LEAST(1 + ST_Height(rast), oldy + newheight), 1) - newy;
IF newwidth < 1 OR newheight < 1 THEN
RETURN rast;
END IF;
IF newkeepdestnodata IS NULL THEN
newkeepdestnodata := FALSE;
END IF;
IF newkeepdestnodata THEN
IF NOT ST_BandNodataValue(rast, newband) IS NULL THEN
rastnodataval := ST_BandNoDataValue(rast, newband);
ELSE
RAISE NOTICE 'ST_SetValues: keepdestnodata was set to TRUE but rast1 does not have a nodata value. keepdestnodata reset to FALSE';
newkeepdestnodata := FALSE;
END IF;
IF ST_BandIsNodata(rast, band) THEN
RETURN rast;
END IF;
END IF;
IF newval IS NULL THEN
newval := ST_BandNoDataValue(rast, band);
END IF;
IF newval IS NULL THEN
RAISE NOTICE 'ST_SetValues: val is NULL and no nodata exist for rast. Returns rast';
RETURN rast;
END IF;
IF newkeepdestnodata THEN
FOR cx IN newx..newx + newwidth - 1 LOOP
FOR cy IN newy..newy + newheight - 1 LOOP
IF ST_Value(newraster, newband, cx, cy) != rastnodataval THEN
newraster := ST_SetValue(newraster, newband, cx, cy, newval);
END IF;
END LOOP;
END LOOP;
ELSE
FOR cx IN newx..newx + newwidth - 1 LOOP
FOR cy IN newy..newy + newheight - 1 LOOP
newraster := ST_SetValue(newraster, newband, cx, cy, newval);
END LOOP;
END LOOP;
END IF;
RETURN newraster;
END;
$$
LANGUAGE 'plpgsql';
-- Variant with band = 1
CREATE OR REPLACE FUNCTION ST_SetValues(rast raster, x int, y int, width int, height int, val float8, keepdestnodata boolean)
RETURNS raster
AS 'SELECT ST_SetValues($1, 1, $2, $3, $4, $5, $6, $7)'
LANGUAGE 'SQL' IMMUTABLE;
-- Variant with band = 1 & keepdestnodata = FALSE
CREATE OR REPLACE FUNCTION ST_SetValues(rast raster, x int, y int, width int, height int, val float8)
RETURNS raster
AS 'SELECT ST_SetValues($1, 1, $2, $3, $4, $5, $6, FALSE)'
LANGUAGE 'SQL' IMMUTABLE;
-- Variant with keepdestnodata = FALSE
CREATE OR REPLACE FUNCTION ST_SetValues(rast raster, band int, x int, y int, width int, height int, val float8)
RETURNS raster
AS 'SELECT ST_SetValues($1, $2, $3, $4, $5, $6, $7, FALSE)'
LANGUAGE 'SQL' IMMUTABLE;
--Test rasters
CREATE OR REPLACE FUNCTION ST_TestRaster(ulx float8, uly float8, val float8)
RETURNS raster AS
$$
DECLARE
BEGIN
RETURN ST_AddBand(ST_MakeEmptyRaster(10, 10, ulx, uly, 1, 1, 0, 0, -1), '32BF', val, -1);
END;
$$
LANGUAGE 'plpgsql';
-- Test
SELECT ST_SetValues(ST_TestRaster(0, 0, 1), 2, 2, 1, 1, 0)
SELECT (pix).geom, (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_TestRaster(0, 0, 1)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_TestRaster(0, 0, 1), 2, 1, 1, 1, 0)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_TestRaster(0, 0, 1), 2, 1, 1, 10, 0)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_TestRaster(0, 0, 1), 1, 1, 4, 4, 0)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_TestRaster(0, 0, 1), 0, 3, 4, 4, 0)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_TestRaster(0, 0, -1), 2, 2, 2, 2, 0, TRUE)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_SetBandNoDataValue(ST_TestRaster(0, 0, -1), NULL), 2, 2, 2, 2, 0, TRUE)) as pix) foo
--------------------------------------------------------------------
-- ST_SetValues - Set a range of raster pixels to values copied from
-- the corresponding pixels in another raster.
-- Arguments
--
-- rast1 raster - Raster to be edited.
-- band1 integer - Band number of the raster to be edited. Default to 1.
-- x, y - Raster coordinates of the upper left corner of the
-- range of pixel to be edited.
-- width, height - Width and height of the range of pixel to be edited.
-- rast2 - Raster values are copied from.
-- band2 - Band number of the raster values are copied from.
-- keepdestnodata - Flag indicating not to change pixels (in the edited
-- raster) set to nodata value. Default to FALSE.
-- keepsourcetnodata - Flag indicating not to copy pixels (from the source
-- raster) set to nodata value. Default to FALSE.
--
-- When x, y, width or height are out of the raster range, only the part
-- of the range intersecting with the raster is set.
--------------------------------------------------------------------
CREATE OR REPLACE FUNCTION ST_SetValues(rast1 raster, band1 int, x int, y int, width int, height int, rast2 raster, band2 int, keepdestnodata boolean, keepsourcenodata boolean)
RETURNS raster AS
$$
DECLARE
newraster raster := rast1;
newwidth int := width;
newheight int := height;
oldx int := x;
oldy int := y;
newx int;
newy int;
newband1 int := band1;
newband2 int := band2;
newkeepdestnodata boolean := keepdestnodata;
newkeepsourcenodata boolean := keepsourcenodata;
r2val float;
rast1nodataval float;
rast2nodataval float;
x2 int;
y2 int;
cx int;
cy int;
BEGIN
IF rast1 IS NULL THEN
RAISE NOTICE 'ST_SetValues: No raster provided. Return NULL';
RETURN NULL;
END IF;
IF ST_IsEmpty(rast1) OR ST_HasNoBand(rast1, band1) THEN
RAISE NOTICE 'ST_SetValues: Empty or no band destination raster provided. Returns rast1';
RETURN rast1;
END IF;
IF rast2 IS NULL OR ST_IsEmpty(rast2) OR ST_HasNoBand(rast2, band2) THEN
RAISE NOTICE 'ST_SetValues: Empty or no band source raster provided. Returns rast1';
RETURN rast1;
END IF;
IF newband1 IS NULL THEN
newband1 := 1;
END IF;
IF newband1 < 1 THEN
RAISE NOTICE 'ST_SetValues: band1 out of range. Returns rast';
RETURN rast1;
END IF;
IF newband2 IS NULL THEN
newband2 := 1;
END IF;
IF newband2 < 1 THEN
RAISE NOTICE 'ST_SetValues: band2 out of range. Returns rast';
RETURN rast1;
END IF;
IF x IS NULL THEN
oldx := 1;
END IF;
newx := 1 + LEAST(GREATEST(0, oldx - 1), ST_Width(rast1));
newwidth := GREATEST(LEAST(1 + ST_Width(rast1), oldx + newwidth), 1) - newx;
oldx := newx;
IF y IS NULL THEN
oldy := 1;
END IF;
--RAISE NOTICE 'aaa oldy=%, newheight=%', oldy, newheight;
newy := 1 + LEAST(GREATEST(0, oldy - 1), ST_Height(rast1));
newheight := GREATEST(LEAST(1 + ST_Height(rast1), oldy + newheight), 1) - newy;
oldy := newy;
--RAISE NOTICE 'bbb newx=%, newy=%', newx, newy;
--RAISE NOTICE 'ccc newwidth=%, newheight=%', newwidth, newheight;
IF newwidth < 1 OR newheight < 1 THEN
RETURN rast1;
END IF;
x2 := ST_World2RasterCoordX(rast1, ST_Raster2WorldCoordX(rast2, 1, 1), ST_Raster2WorldCoordY(rast2, 1, 1));
y2 := ST_World2RasterCoordY(rast1, ST_Raster2WorldCoordY(rast2, 1, 1), ST_Raster2WorldCoordY(rast2, 1, 1));
--RAISE NOTICE '111 x2=%, y2=%', x2, y2;
newx := x2 + LEAST(GREATEST(0, oldx - x2), ST_Width(rast2));
newwidth := GREATEST(LEAST(x2 + ST_Width(rast2), oldx + newwidth), x2) - newx;
newy := y2 + LEAST(GREATEST(0, oldy - y2), ST_Height(rast2));
newheight := GREATEST(LEAST(y2 + ST_Height(rast2), oldy + newheight), y2) - newy;
IF newwidth < 1 OR newheight < 1 THEN
RETURN rast1;
END IF;
--RAISE NOTICE '222 newx=%, newy=%', newx, newy;
--RAISE NOTICE '333 newwidth=%, newheight=%', newwidth, newheight;
IF newkeepdestnodata IS NULL THEN
newkeepdestnodata := FALSE;
END IF;
IF newkeepdestnodata THEN
IF NOT ST_BandNodataValue(rast1, newband1) IS NULL THEN
rast1nodataval := ST_BandNoDataValue(rast1, newband1);
ELSE
RAISE NOTICE 'ST_SetValues: keepdestnodata was set to TRUE but rast1 does not have a nodata value. keepdestnodata reset to FALSE';
newkeepdestnodata := FALSE;
END IF;
IF ST_BandIsNodata(rast1, newband1) THEN
RETURN rast1;
END IF;
END IF;
IF newkeepsourcenodata IS NULL THEN
newkeepsourcenodata := FALSE;
END IF;
IF newkeepsourcenodata THEN
IF NOT ST_BandNodataValue(rast2, newband2) IS NULL THEN
rast2nodataval := ST_BandNoDataValue(rast2, newband2);
ELSE
RAISE NOTICE 'ST_SetValues: keepsourcenodata was set to true but rast2 does not have a nodata value. keepsourcenodata reset to false';
newkeepsourcenodata := FALSE;
END IF;
IF ST_BandIsNodata(rast2, newband2) THEN
RETURN rast1;
END IF;
END IF;
IF newkeepdestnodata THEN
FOR cx IN newx..newx + newwidth - 1 LOOP
FOR cy IN newy..newy + newheight - 1 LOOP
r2val := ST_Value(rast2, newband2, cx - x2 + 1, cy - y2 + 1);
--RAISE NOTICE '444 x=%, y=%', cx, cy;
IF (ST_Value(newraster, newband1, cx, cy) != rast1nodataval) AND (NOT newkeepsourcenodata OR r2val != rast2nodataval) THEN
newraster := ST_SetValue(newraster, newband1, cx, cy, r2val);
END IF;
END LOOP;
END LOOP;
ELSE
--RAISE NOTICE '555 newx + newwidth - 1=%, newy + newheight - 1=%', newx + newwidth - 1, newy + newheight - 1;
FOR cx IN newx..newx + newwidth - 1 LOOP
FOR cy IN newy..newy + newheight - 1 LOOP
r2val := ST_Value(rast2, newband2, cx - x2 + 1, cy - y2 + 1);
--RAISE NOTICE '666 x=%, y=%', cx, cy;
IF NOT newkeepsourcenodata OR r2val != rast2nodataval THEN
newraster := ST_SetValue(newraster, newband1, cx, cy, r2val);
END IF;
END LOOP;
END LOOP;
END IF;
RETURN newraster;
END;
$$
LANGUAGE 'plpgsql';
-- Variant with both band = 1
CREATE OR REPLACE FUNCTION ST_SetValues(rast1 raster, x int, y int, width int, height int, rast2 raster, keepdestnodata boolean, keepsourcenodata boolean)
RETURNS raster
AS 'SELECT ST_SetValues($1, 1, $2, $3, $4, $5, $6, 1, $7, $8)'
LANGUAGE 'SQL' IMMUTABLE;
-- Variant with both band = 1 & both keepnodata = FALSE
CREATE OR REPLACE FUNCTION ST_SetValues(rast1 raster, x int, y int, width int, height int, rast2 raster)
RETURNS raster
AS 'SELECT ST_SetValues($1, 1, $2, $3, $4, $5, $6, 1, FALSE, FALSE)'
LANGUAGE 'SQL' IMMUTABLE;
-- Test
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_TestRaster(0, 0, 1)) as pix) foo
SELECT ST_AsBinary((pix).geom), (pix).val
FROM (SELECT ST_PixelAsPolygons(ST_SetValues(ST_TestRaster(0, 0, 1), 2, 1, 3, 1, ST_TestRaster(3, 0, 3))) as pix) foo
|
