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Java example source code file (OGLMaskBlit.c)

This example Java source code file (OGLMaskBlit.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

check_previous_op, gl_bgra, gl_modulate, gl_nearest, gl_texture_mag_filter, gl_unsigned_int_8_8_8_8_rev, glfloat, headless, j2drlstraceln, j2dtraceln, oglc_blit_tile_size, oglcontext, oglmaskblit_maskblit, return_if_null

The OGLMaskBlit.c Java example source code

/*
 * Copyright (c) 2003, 2007, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#ifndef HEADLESS

#include <stdlib.h>
#include <jlong.h>

#include "OGLMaskBlit.h"
#include "OGLRenderQueue.h"
#include "OGLSurfaceData.h"

/**
 * REMIND: This method assumes that the dimensions of the incoming pixel
 *         array are less than or equal to the cached blit texture tile;
 *         these are rather fragile assumptions, and should be cleaned up...
 */
void
OGLMaskBlit_MaskBlit(JNIEnv *env, OGLContext *oglc,
                     jint dstx, jint dsty,
                     jint width, jint height,
                     void *pPixels)
{
    GLfloat tx1, ty1, tx2, ty2;

    J2dTraceLn(J2D_TRACE_INFO, "OGLMaskBlit_MaskBlit");

    if (width <= 0 || height <= 0) {
        J2dTraceLn(J2D_TRACE_WARNING,
                   "OGLMaskBlit_MaskBlit: invalid dimensions");
        return;
    }

    RETURN_IF_NULL(pPixels);
    RETURN_IF_NULL(oglc);
    CHECK_PREVIOUS_OP(GL_TEXTURE_2D);

    if (oglc->blitTextureID == 0) {
        if (!OGLContext_InitBlitTileTexture(oglc)) {
            J2dRlsTraceLn(J2D_TRACE_ERROR,
                "OGLMaskBlit_MaskBlit: could not init blit tile");
            return;
        }
    }

    // set up texture parameters
    j2d_glBindTexture(GL_TEXTURE_2D, oglc->blitTextureID);
    OGLC_UPDATE_TEXTURE_FUNCTION(oglc, GL_MODULATE);
    j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    // copy system memory IntArgbPre surface into cached texture
    j2d_glTexSubImage2D(GL_TEXTURE_2D, 0,
                        0, 0, width, height,
                        GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, pPixels);

    tx1 = 0.0f;
    ty1 = 0.0f;
    tx2 = ((GLfloat)width) / OGLC_BLIT_TILE_SIZE;
    ty2 = ((GLfloat)height) / OGLC_BLIT_TILE_SIZE;

    // render cached texture to the OpenGL surface
    j2d_glBegin(GL_QUADS);
    j2d_glTexCoord2f(tx1, ty1); j2d_glVertex2i(dstx, dsty);
    j2d_glTexCoord2f(tx2, ty1); j2d_glVertex2i(dstx + width, dsty);
    j2d_glTexCoord2f(tx2, ty2); j2d_glVertex2i(dstx + width, dsty + height);
    j2d_glTexCoord2f(tx1, ty2); j2d_glVertex2i(dstx, dsty + height);
    j2d_glEnd();
}

#endif /* !HEADLESS */

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