J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | #ifndef HEADLESS |
| 27 | |
| 28 | #include "sun_java2d_opengl_OGLMaskFill.h" |
| 29 | |
| 30 | #include "OGLMaskFill.h" |
| 31 | #include "OGLRenderQueue.h" |
| 32 | #include "OGLVertexCache.h" |
| 33 | |
| 34 | /** |
| 35 | * This implementation first copies the alpha tile into a texture and then |
| 36 | * maps that texture to the destination surface. This approach appears to |
| 37 | * offer the best performance despite being a two-step process. |
| 38 | * |
| 39 | * When the source paint is a Color, we can simply use the GL_MODULATE |
| 40 | * function to multiply the current color (already premultiplied with the |
| 41 | * extra alpha value from the AlphaComposite) with the alpha value from |
| 42 | * the mask texture tile. In picture form, this process looks like: |
| 43 | * |
| 44 | * A R G B |
| 45 | * primary color Pa Pr Pg Pb (modulated with...) |
| 46 | * texture unit 0 Ca Ca Ca Ca |
| 47 | * --------------------------------------- |
| 48 | * resulting color Ra Rr Rg Rb |
| 49 | * |
| 50 | * where: |
| 51 | * Px = current color (already premultiplied by extra alpha) |
| 52 | * Cx = coverage value from mask tile |
| 53 | * Rx = resulting color/alpha component |
| 54 | * |
| 55 | * When the source paint is not a Color, it means that we are rendering with |
| 56 | * a complex paint (e.g. GradientPaint, TexturePaint). In this case, we |
| 57 | * rely on the GL_ARB_multitexture extension to effectively multiply the |
| 58 | * paint fragments (autogenerated on texture unit 1, see the |
| 59 | * OGLPaints_Set{Gradient,Texture,etc}Paint() methods for more details) |
| 60 | * with the coverage values from the mask texture tile (provided on texture |
| 61 | * unit 0), all of which is multiplied with the current color value (which |
| 62 | * contains the extra alpha value). In picture form: |
| 63 | * |
| 64 | * A R G B |
| 65 | * primary color Ea Ea Ea Ea (modulated with...) |
| 66 | * texture unit 0 Ca Ca Ca Ca (modulated with...) |
| 67 | * texture unit 1 Pa Pr Pg Pb |
| 68 | * --------------------------------------- |
| 69 | * resulting color Ra Rr Rg Rb |
| 70 | * |
| 71 | * where: |
| 72 | * Ea = extra alpha |
| 73 | * Cx = coverage value from mask tile |
| 74 | * Px = gradient/texture paint color (generated for each fragment) |
| 75 | * Rx = resulting color/alpha component |
| 76 | * |
| 77 | * Here are some descriptions of the many variables used in this method: |
| 78 | * x,y - upper left corner of the tile destination |
| 79 | * w,h - width/height of the mask tile |
| 80 | * x0 - placekeeper for the original destination x location |
| 81 | * tw,th - width/height of the actual texture tile in pixels |
| 82 | * sx1,sy1 - upper left corner of the mask tile source region |
| 83 | * sx2,sy2 - lower left corner of the mask tile source region |
| 84 | * sx,sy - "current" upper left corner of the mask tile region of interest |
| 85 | */ |
| 86 | void |
| 87 | OGLMaskFill_MaskFill(OGLContext *oglc, |
| 88 | jint x, jint y, jint w, jint h, |
| 89 | jint maskoff, jint maskscan, jint masklen, |
| 90 | unsigned char *pMask) |
| 91 | { |
| 92 | J2dTraceLn(J2D_TRACE_INFO, "OGLMaskFill_MaskFill"); |
| 93 | |
| 94 | RETURN_IF_NULL(oglc); |
| 95 | CHECK_PREVIOUS_OP(OGL_STATE_MASK_OP); |
| 96 | |
| 97 | J2dTraceLn4(J2D_TRACE_VERBOSE, " x=%d y=%d w=%d h=%d", x, y, w, h); |
| 98 | J2dTraceLn2(J2D_TRACE_VERBOSE, " maskoff=%d maskscan=%d", |
| 99 | maskoff, maskscan); |
| 100 | |
| 101 | { |
| 102 | jint tw, th, x0; |
| 103 | jint sx1, sy1, sx2, sy2; |
| 104 | jint sx, sy, sw, sh; |
| 105 | |
| 106 | x0 = x; |
| 107 | tw = OGLVC_MASK_CACHE_TILE_WIDTH; |
| 108 | th = OGLVC_MASK_CACHE_TILE_HEIGHT; |
| 109 | sx1 = maskoff % maskscan; |
| 110 | sy1 = maskoff / maskscan; |
| 111 | sx2 = sx1 + w; |
| 112 | sy2 = sy1 + h; |
| 113 | |
| 114 | for (sy = sy1; sy < sy2; sy += th, y += th) { |
| 115 | x = x0; |
| 116 | sh = ((sy + th) > sy2) ? (sy2 - sy) : th; |
| 117 | |
| 118 | for (sx = sx1; sx < sx2; sx += tw, x += tw) { |
| 119 | sw = ((sx + tw) > sx2) ? (sx2 - sx) : tw; |
| 120 | |
| 121 | OGLVertexCache_AddMaskQuad(oglc, |
| 122 | sx, sy, x, y, sw, sh, |
| 123 | maskscan, pMask); |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | JNIEXPORT void JNICALL |
| 130 | Java_sun_java2d_opengl_OGLMaskFill_maskFill |
| 131 | (JNIEnv *env, jobject self, |
| 132 | jint x, jint y, jint w, jint h, |
| 133 | jint maskoff, jint maskscan, jint masklen, |
| 134 | jbyteArray maskArray) |
| 135 | { |
| 136 | OGLContext *oglc = OGLRenderQueue_GetCurrentContext(); |
| 137 | unsigned char *mask; |
| 138 | |
| 139 | J2dTraceLn(J2D_TRACE_ERROR, "OGLMaskFill_maskFill"); |
| 140 | |
| 141 | if (maskArray != NULL) { |
| 142 | mask = (unsigned char *) |
| 143 | (*env)->GetPrimitiveArrayCritical(env, maskArray, NULL); |
| 144 | } else { |
| 145 | mask = NULL; |
| 146 | } |
| 147 | |
| 148 | OGLMaskFill_MaskFill(oglc, |
| 149 | x, y, w, h, |
| 150 | maskoff, maskscan, masklen, mask); |
| 151 | |
| 152 | // 6358147: reset current state, and ensure rendering is flushed to dest |
| 153 | if (oglc != NULL) { |
| 154 | RESET_PREVIOUS_OP(); |
| 155 | j2d_glFlush(); |
| 156 | } |
| 157 | |
| 158 | if (mask != NULL) { |
| 159 | (*env)->ReleasePrimitiveArrayCritical(env, maskArray, mask, JNI_ABORT); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | #endif /* !HEADLESS */ |