/*
* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
#ifndef HEADLESS
#include "sun_java2d_opengl_OGLMaskFill.h"
#include "OGLMaskFill.h"
#include "OGLRenderQueue.h"
#include "OGLVertexCache.h"
/**
* This implementation first copies the alpha tile into a texture and then
* maps that texture to the destination surface. This approach appears to
* offer the best performance despite being a two-step process.
*
* When the source paint is a Color, we can simply use the GL_MODULATE
* function to multiply the current color (already premultiplied with the
* extra alpha value from the AlphaComposite) with the alpha value from
* the mask texture tile. In picture form, this process looks like:
*
* A R G B
* primary color Pa Pr Pg Pb (modulated with...)
* texture unit 0 Ca Ca Ca Ca
* ---------------------------------------
* resulting color Ra Rr Rg Rb
*
* where:
* Px = current color (already premultiplied by extra alpha)
* Cx = coverage value from mask tile
* Rx = resulting color/alpha component
*
* When the source paint is not a Color, it means that we are rendering with
* a complex paint (e.g. GradientPaint, TexturePaint). In this case, we
* rely on the GL_ARB_multitexture extension to effectively multiply the
* paint fragments (autogenerated on texture unit 1, see the
* OGLPaints_Set{Gradient,Texture,etc}Paint() methods for more details)
* with the coverage values from the mask texture tile (provided on texture
* unit 0), all of which is multiplied with the current color value (which
* contains the extra alpha value). In picture form:
*
* A R G B
* primary color Ea Ea Ea Ea (modulated with...)
* texture unit 0 Ca Ca Ca Ca (modulated with...)
* texture unit 1 Pa Pr Pg Pb
* ---------------------------------------
* resulting color Ra Rr Rg Rb
*
* where:
* Ea = extra alpha
* Cx = coverage value from mask tile
* Px = gradient/texture paint color (generated for each fragment)
* Rx = resulting color/alpha component
*
* Here are some descriptions of the many variables used in this method:
* x,y - upper left corner of the tile destination
* w,h - width/height of the mask tile
* x0 - placekeeper for the original destination x location
* tw,th - width/height of the actual texture tile in pixels
* sx1,sy1 - upper left corner of the mask tile source region
* sx2,sy2 - lower left corner of the mask tile source region
* sx,sy - "current" upper left corner of the mask tile region of interest
*/
void
OGLMaskFill_MaskFill(OGLContext *oglc,
jint x, jint y, jint w, jint h,
jint maskoff, jint maskscan, jint masklen,
unsigned char *pMask)
{
J2dTraceLn(J2D_TRACE_INFO, "OGLMaskFill_MaskFill");
RETURN_IF_NULL(oglc);
CHECK_PREVIOUS_OP(OGL_STATE_MASK_OP);
J2dTraceLn4(J2D_TRACE_VERBOSE, " x=%d y=%d w=%d h=%d", x, y, w, h);
J2dTraceLn2(J2D_TRACE_VERBOSE, " maskoff=%d maskscan=%d",
maskoff, maskscan);
{
jint tw, th, x0;
jint sx1, sy1, sx2, sy2;
jint sx, sy, sw, sh;
x0 = x;
tw = OGLVC_MASK_CACHE_TILE_WIDTH;
th = OGLVC_MASK_CACHE_TILE_HEIGHT;
sx1 = maskoff % maskscan;
sy1 = maskoff / maskscan;
sx2 = sx1 + w;
sy2 = sy1 + h;
for (sy = sy1; sy < sy2; sy += th, y += th) {
x = x0;
sh = ((sy + th) > sy2) ? (sy2 - sy) : th;
for (sx = sx1; sx < sx2; sx += tw, x += tw) {
sw = ((sx + tw) > sx2) ? (sx2 - sx) : tw;
OGLVertexCache_AddMaskQuad(oglc,
sx, sy, x, y, sw, sh,
maskscan, pMask);
}
}
}
}
JNIEXPORT void JNICALL
Java_sun_java2d_opengl_OGLMaskFill_maskFill
(JNIEnv *env, jobject self,
jint x, jint y, jint w, jint h,
jint maskoff, jint maskscan, jint masklen,
jbyteArray maskArray)
{
OGLContext *oglc = OGLRenderQueue_GetCurrentContext();
unsigned char *mask;
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