--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/share/native/common/java2d/opengl/OGLRenderer.c Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,812 @@
+/*
+ * Copyright (c) 2003, 2008, 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 <jlong.h>
+#include <jni_util.h>
+#include <math.h>
+
+#include "sun_java2d_opengl_OGLRenderer.h"
+
+#include "OGLRenderer.h"
+#include "OGLRenderQueue.h"
+#include "OGLSurfaceData.h"
+
+/**
+ * Note: Some of the methods in this file apply a "magic number"
+ * translation to line segments. The OpenGL specification lays out the
+ * "diamond exit rule" for line rasterization, but it is loose enough to
+ * allow for a wide range of line rendering hardware. (It appears that
+ * some hardware, such as the Nvidia GeForce2 series, does not even meet
+ * the spec in all cases.) As such it is difficult to find a mapping
+ * between the Java2D and OpenGL line specs that works consistently across
+ * all hardware combinations.
+ *
+ * Therefore the "magic numbers" you see here have been empirically derived
+ * after testing on a variety of graphics hardware in order to find some
+ * reasonable middle ground between the two specifications. The general
+ * approach is to apply a fractional translation to vertices so that they
+ * hit pixel centers and therefore touch the same pixels as in our other
+ * pipelines. Emphasis was placed on finding values so that OGL lines with
+ * a slope of +/- 1 hit all the same pixels as our other (software) loops.
+ * The stepping in other diagonal lines rendered with OGL may deviate
+ * slightly from those rendered with our software loops, but the most
+ * important thing is that these magic numbers ensure that all OGL lines
+ * hit the same endpoints as our software loops.
+ *
+ * If you find it necessary to change any of these magic numbers in the
+ * future, just be sure that you test the changes across a variety of
+ * hardware to ensure consistent rendering everywhere.
+ */
+
+void
+OGLRenderer_DrawLine(OGLContext *oglc, jint x1, jint y1, jint x2, jint y2)
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawLine");
+
+ RETURN_IF_NULL(oglc);
+
+ CHECK_PREVIOUS_OP(GL_LINES);
+
+ if (y1 == y2) {
+ // horizontal
+ GLfloat fx1 = (GLfloat)x1;
+ GLfloat fx2 = (GLfloat)x2;
+ GLfloat fy = ((GLfloat)y1) + 0.2f;
+
+ if (x1 > x2) {
+ GLfloat t = fx1; fx1 = fx2; fx2 = t;
+ }
+
+ j2d_glVertex2f(fx1+0.2f, fy);
+ j2d_glVertex2f(fx2+1.2f, fy);
+ } else if (x1 == x2) {
+ // vertical
+ GLfloat fx = ((GLfloat)x1) + 0.2f;
+ GLfloat fy1 = (GLfloat)y1;
+ GLfloat fy2 = (GLfloat)y2;
+
+ if (y1 > y2) {
+ GLfloat t = fy1; fy1 = fy2; fy2 = t;
+ }
+
+ j2d_glVertex2f(fx, fy1+0.2f);
+ j2d_glVertex2f(fx, fy2+1.2f);
+ } else {
+ // diagonal
+ GLfloat fx1 = (GLfloat)x1;
+ GLfloat fy1 = (GLfloat)y1;
+ GLfloat fx2 = (GLfloat)x2;
+ GLfloat fy2 = (GLfloat)y2;
+
+ if (x1 < x2) {
+ fx1 += 0.2f;
+ fx2 += 1.0f;
+ } else {
+ fx1 += 0.8f;
+ fx2 -= 0.2f;
+ }
+
+ if (y1 < y2) {
+ fy1 += 0.2f;
+ fy2 += 1.0f;
+ } else {
+ fy1 += 0.8f;
+ fy2 -= 0.2f;
+ }
+
+ j2d_glVertex2f(fx1, fy1);
+ j2d_glVertex2f(fx2, fy2);
+ }
+}
+
+void
+OGLRenderer_DrawRect(OGLContext *oglc, jint x, jint y, jint w, jint h)
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawRect");
+
+ if (w < 0 || h < 0) {
+ return;
+ }
+
+ RETURN_IF_NULL(oglc);
+
+ if (w < 2 || h < 2) {
+ // If one dimension is less than 2 then there is no
+ // gap in the middle - draw a solid filled rectangle.
+ CHECK_PREVIOUS_OP(GL_QUADS);
+ GLRECT_BODY_XYWH(x, y, w+1, h+1);
+ } else {
+ GLfloat fx1 = ((GLfloat)x) + 0.2f;
+ GLfloat fy1 = ((GLfloat)y) + 0.2f;
+ GLfloat fx2 = fx1 + ((GLfloat)w);
+ GLfloat fy2 = fy1 + ((GLfloat)h);
+
+ // Avoid drawing the endpoints twice.
+ // Also prefer including the endpoints in the
+ // horizontal sections which draw pixels faster.
+
+ CHECK_PREVIOUS_OP(GL_LINES);
+ // top
+ j2d_glVertex2f(fx1, fy1);
+ j2d_glVertex2f(fx2+1.0f, fy1);
+ // right
+ j2d_glVertex2f(fx2, fy1+1.0f);
+ j2d_glVertex2f(fx2, fy2);
+ // bottom
+ j2d_glVertex2f(fx1, fy2);
+ j2d_glVertex2f(fx2+1.0f, fy2);
+ // left
+ j2d_glVertex2f(fx1, fy1+1.0f);
+ j2d_glVertex2f(fx1, fy2);
+ }
+}
+
+void
+OGLRenderer_DrawPoly(OGLContext *oglc,
+ jint nPoints, jint isClosed,
+ jint transX, jint transY,
+ jint *xPoints, jint *yPoints)
+{
+ jboolean isEmpty = JNI_TRUE;
+ jint mx, my;
+ jint i;
+
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawPoly");
+
+ if (xPoints == NULL || yPoints == NULL) {
+ J2dRlsTraceLn(J2D_TRACE_ERROR,
+ "OGLRenderer_DrawPoly: points array is null");
+ return;
+ }
+
+ RETURN_IF_NULL(oglc);
+
+ // Note that BufferedRenderPipe.drawPoly() has already rejected polys
+ // with nPoints<2, so we can be certain here that we have nPoints>=2.
+
+ mx = xPoints[0];
+ my = yPoints[0];
+
+ CHECK_PREVIOUS_OP(GL_LINE_STRIP);
+ for (i = 0; i < nPoints; i++) {
+ jint x = xPoints[i];
+ jint y = yPoints[i];
+
+ isEmpty = isEmpty && (x == mx && y == my);
+
+ // Translate each vertex by a fraction so that we hit pixel centers.
+ j2d_glVertex2f((GLfloat)(x + transX) + 0.5f,
+ (GLfloat)(y + transY) + 0.5f);
+ }
+
+ if (isClosed && !isEmpty &&
+ (xPoints[nPoints-1] != mx ||
+ yPoints[nPoints-1] != my))
+ {
+ // In this case, the polyline's start and end positions are
+ // different and need to be closed manually; we do this by adding
+ // one more segment back to the starting position. Note that we
+ // do not need to fill in the last pixel (as we do in the following
+ // block) because we are returning to the starting pixel, which
+ // has already been filled in.
+ j2d_glVertex2f((GLfloat)(mx + transX) + 0.5f,
+ (GLfloat)(my + transY) + 0.5f);
+ RESET_PREVIOUS_OP(); // so that we don't leave the line strip open
+ } else if (!isClosed || isEmpty) {
+ // OpenGL omits the last pixel in a polyline, so we fix this by
+ // adding a one-pixel segment at the end. Also, if the polyline
+ // never went anywhere (isEmpty is true), we need to use this
+ // workaround to ensure that a single pixel is touched.
+ CHECK_PREVIOUS_OP(GL_LINES); // this closes the line strip first
+ mx = xPoints[nPoints-1] + transX;
+ my = yPoints[nPoints-1] + transY;
+ j2d_glVertex2i(mx, my);
+ j2d_glVertex2i(mx+1, my+1);
+ // no need for RESET_PREVIOUS_OP, as the line strip is no longer open
+ } else {
+ RESET_PREVIOUS_OP(); // so that we don't leave the line strip open
+ }
+}
+
+JNIEXPORT void JNICALL
+Java_sun_java2d_opengl_OGLRenderer_drawPoly
+ (JNIEnv *env, jobject oglr,
+ jintArray xpointsArray, jintArray ypointsArray,
+ jint nPoints, jboolean isClosed,
+ jint transX, jint transY)
+{
+ jint *xPoints, *yPoints;
+
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_drawPoly");
+
+ xPoints = (jint *)
+ (*env)->GetPrimitiveArrayCritical(env, xpointsArray, NULL);
+ if (xPoints != NULL) {
+ yPoints = (jint *)
+ (*env)->GetPrimitiveArrayCritical(env, ypointsArray, NULL);
+ if (yPoints != NULL) {
+ OGLContext *oglc = OGLRenderQueue_GetCurrentContext();
+
+ OGLRenderer_DrawPoly(oglc,
+ nPoints, isClosed,
+ transX, transY,
+ xPoints, yPoints);
+
+ // 6358147: reset current state, and ensure rendering is
+ // flushed to dest
+ if (oglc != NULL) {
+ RESET_PREVIOUS_OP();
+ j2d_glFlush();
+ }
+
+ (*env)->ReleasePrimitiveArrayCritical(env, ypointsArray, yPoints,
+ JNI_ABORT);
+ }
+ (*env)->ReleasePrimitiveArrayCritical(env, xpointsArray, xPoints,
+ JNI_ABORT);
+ }
+}
+
+void
+OGLRenderer_DrawScanlines(OGLContext *oglc,
+ jint scanlineCount, jint *scanlines)
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawScanlines");
+
+ RETURN_IF_NULL(oglc);
+ RETURN_IF_NULL(scanlines);
+
+ CHECK_PREVIOUS_OP(GL_LINES);
+ while (scanlineCount > 0) {
+ // Translate each vertex by a fraction so
+ // that we hit pixel centers.
+ GLfloat x1 = ((GLfloat)*(scanlines++)) + 0.2f;
+ GLfloat x2 = ((GLfloat)*(scanlines++)) + 1.2f;
+ GLfloat y = ((GLfloat)*(scanlines++)) + 0.5f;
+ j2d_glVertex2f(x1, y);
+ j2d_glVertex2f(x2, y);
+ scanlineCount--;
+ }
+}
+
+void
+OGLRenderer_FillRect(OGLContext *oglc, jint x, jint y, jint w, jint h)
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_FillRect");
+
+ if (w <= 0 || h <= 0) {
+ return;
+ }
+
+ RETURN_IF_NULL(oglc);
+
+ CHECK_PREVIOUS_OP(GL_QUADS);
+ GLRECT_BODY_XYWH(x, y, w, h);
+}
+
+void
+OGLRenderer_FillSpans(OGLContext *oglc, jint spanCount, jint *spans)
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_FillSpans");
+
+ RETURN_IF_NULL(oglc);
+ RETURN_IF_NULL(spans);
+
+ CHECK_PREVIOUS_OP(GL_QUADS);
+ while (spanCount > 0) {
+ jint x1 = *(spans++);
+ jint y1 = *(spans++);
+ jint x2 = *(spans++);
+ jint y2 = *(spans++);
+ GLRECT_BODY_XYXY(x1, y1, x2, y2);
+ spanCount--;
+ }
+}
+
+#define FILL_PGRAM(fx11, fy11, dx21, dy21, dx12, dy12) \
+ do { \
+ j2d_glVertex2f(fx11, fy11); \
+ j2d_glVertex2f(fx11 + dx21, fy11 + dy21); \
+ j2d_glVertex2f(fx11 + dx21 + dx12, fy11 + dy21 + dy12); \
+ j2d_glVertex2f(fx11 + dx12, fy11 + dy12); \
+ } while (0)
+
+void
+OGLRenderer_FillParallelogram(OGLContext *oglc,
+ jfloat fx11, jfloat fy11,
+ jfloat dx21, jfloat dy21,
+ jfloat dx12, jfloat dy12)
+{
+ J2dTraceLn6(J2D_TRACE_INFO,
+ "OGLRenderer_FillParallelogram "
+ "(x=%6.2f y=%6.2f "
+ "dx1=%6.2f dy1=%6.2f "
+ "dx2=%6.2f dy2=%6.2f)",
+ fx11, fy11,
+ dx21, dy21,
+ dx12, dy12);
+
+ RETURN_IF_NULL(oglc);
+
+ CHECK_PREVIOUS_OP(GL_QUADS);
+
+ FILL_PGRAM(fx11, fy11, dx21, dy21, dx12, dy12);
+}
+
+void
+OGLRenderer_DrawParallelogram(OGLContext *oglc,
+ jfloat fx11, jfloat fy11,
+ jfloat dx21, jfloat dy21,
+ jfloat dx12, jfloat dy12,
+ jfloat lwr21, jfloat lwr12)
+{
+ // dx,dy for line width in the "21" and "12" directions.
+ jfloat ldx21 = dx21 * lwr21;
+ jfloat ldy21 = dy21 * lwr21;
+ jfloat ldx12 = dx12 * lwr12;
+ jfloat ldy12 = dy12 * lwr12;
+
+ // calculate origin of the outer parallelogram
+ jfloat ox11 = fx11 - (ldx21 + ldx12) / 2.0f;
+ jfloat oy11 = fy11 - (ldy21 + ldy12) / 2.0f;
+
+ J2dTraceLn8(J2D_TRACE_INFO,
+ "OGLRenderer_DrawParallelogram "
+ "(x=%6.2f y=%6.2f "
+ "dx1=%6.2f dy1=%6.2f lwr1=%6.2f "
+ "dx2=%6.2f dy2=%6.2f lwr2=%6.2f)",
+ fx11, fy11,
+ dx21, dy21, lwr21,
+ dx12, dy12, lwr12);
+
+ RETURN_IF_NULL(oglc);
+
+ CHECK_PREVIOUS_OP(GL_QUADS);
+
+ // Only need to generate 4 quads if the interior still
+ // has a hole in it (i.e. if the line width ratio was
+ // less than 1.0)
+ if (lwr21 < 1.0f && lwr12 < 1.0f) {
+ // Note: "TOP", "BOTTOM", "LEFT" and "RIGHT" here are
+ // relative to whether the dxNN variables are positive
+ // and negative. The math works fine regardless of
+ // their signs, but for conceptual simplicity the
+ // comments will refer to the sides as if the dxNN
+ // were all positive. "TOP" and "BOTTOM" segments
+ // are defined by the dxy21 deltas. "LEFT" and "RIGHT"
+ // segments are defined by the dxy12 deltas.
+
+ // Each segment includes its starting corner and comes
+ // to just short of the following corner. Thus, each
+ // corner is included just once and the only lengths
+ // needed are the original parallelogram delta lengths
+ // and the "line width deltas". The sides will cover
+ // the following relative territories:
+ //
+ // T T T T T R
+ // L R
+ // L R
+ // L R
+ // L R
+ // L B B B B B
+
+ // TOP segment, to left side of RIGHT edge
+ // "width" of original pgram, "height" of hor. line size
+ fx11 = ox11;
+ fy11 = oy11;
+ FILL_PGRAM(fx11, fy11, dx21, dy21, ldx12, ldy12);
+
+ // RIGHT segment, to top of BOTTOM edge
+ // "width" of vert. line size , "height" of original pgram
+ fx11 = ox11 + dx21;
+ fy11 = oy11 + dy21;
+ FILL_PGRAM(fx11, fy11, ldx21, ldy21, dx12, dy12);
+
+ // BOTTOM segment, from right side of LEFT edge
+ // "width" of original pgram, "height" of hor. line size
+ fx11 = ox11 + dx12 + ldx21;
+ fy11 = oy11 + dy12 + ldy21;
+ FILL_PGRAM(fx11, fy11, dx21, dy21, ldx12, ldy12);
+
+ // LEFT segment, from bottom of TOP edge
+ // "width" of vert. line size , "height" of inner pgram
+ fx11 = ox11 + ldx12;
+ fy11 = oy11 + ldy12;
+ FILL_PGRAM(fx11, fy11, ldx21, ldy21, dx12, dy12);
+ } else {
+ // The line width ratios were large enough to consume
+ // the entire hole in the middle of the parallelogram
+ // so we can just issue one large quad for the outer
+ // parallelogram.
+ dx21 += ldx21;
+ dy21 += ldy21;
+ dx12 += ldx12;
+ dy12 += ldy12;
+ FILL_PGRAM(ox11, oy11, dx21, dy21, dx12, dy12);
+ }
+}
+
+static GLhandleARB aaPgramProgram = 0;
+
+/*
+ * This shader fills the space between an outer and inner parallelogram.
+ * It can be used to draw an outline by specifying both inner and outer
+ * values. It fills pixels by estimating what portion falls inside the
+ * outer shape, and subtracting an estimate of what portion falls inside
+ * the inner shape. Specifying both inner and outer values produces a
+ * standard "wide outline". Specifying an inner shape that falls far
+ * outside the outer shape allows the same shader to fill the outer
+ * shape entirely since pixels that fall within the outer shape are never
+ * inside the inner shape and so they are filled based solely on their
+ * coverage of the outer shape.
+ *
+ * The setup code renders this shader over the bounds of the outer
+ * shape (or the only shape in the case of a fill operation) and
+ * sets the texture 0 coordinates so that 0,0=>0,1=>1,1=>1,0 in those
+ * texture coordinates map to the four corners of the parallelogram.
+ * Similarly the texture 1 coordinates map the inner shape to the
+ * unit square as well, but in a different coordinate system.
+ *
+ * When viewed in the texture coordinate systems the parallelograms
+ * we are filling are unit squares, but the pixels have then become
+ * tiny parallelograms themselves. Both of the texture coordinate
+ * systems are affine transforms so the rate of change in X and Y
+ * of the texture coordinates are essentially constants and happen
+ * to correspond to the size and direction of the slanted sides of
+ * the distorted pixels relative to the "square mapped" boundary
+ * of the parallelograms.
+ *
+ * The shader uses the dFdx() and dFdy() functions to measure the "rate
+ * of change" of these texture coordinates and thus gets an accurate
+ * measure of the size and shape of a pixel relative to the two
+ * parallelograms. It then uses the bounds of the size and shape
+ * of a pixel to intersect with the unit square to estimate the
+ * coverage of the pixel. Unfortunately, without a lot more work
+ * to calculate the exact area of intersection between a unit
+ * square (the original parallelogram) and a parallelogram (the
+ * distorted pixel), this shader only approximates the pixel
+ * coverage, but emperically the estimate is very useful and
+ * produces visually pleasing results, if not theoretically accurate.
+ */
+static const char *aaPgramShaderSource =
+ "void main() {"
+ // Calculate the vectors for the "legs" of the pixel parallelogram
+ // for the outer parallelogram.
+ " vec2 oleg1 = dFdx(gl_TexCoord[0].st);"
+ " vec2 oleg2 = dFdy(gl_TexCoord[0].st);"
+ // Calculate the bounds of the distorted pixel parallelogram.
+ " vec2 corner = gl_TexCoord[0].st - (oleg1+oleg2)/2.0;"
+ " vec2 omin = min(corner, corner+oleg1);"
+ " omin = min(omin, corner+oleg2);"
+ " omin = min(omin, corner+oleg1+oleg2);"
+ " vec2 omax = max(corner, corner+oleg1);"
+ " omax = max(omax, corner+oleg2);"
+ " omax = max(omax, corner+oleg1+oleg2);"
+ // Calculate the vectors for the "legs" of the pixel parallelogram
+ // for the inner parallelogram.
+ " vec2 ileg1 = dFdx(gl_TexCoord[1].st);"
+ " vec2 ileg2 = dFdy(gl_TexCoord[1].st);"
+ // Calculate the bounds of the distorted pixel parallelogram.
+ " corner = gl_TexCoord[1].st - (ileg1+ileg2)/2.0;"
+ " vec2 imin = min(corner, corner+ileg1);"
+ " imin = min(imin, corner+ileg2);"
+ " imin = min(imin, corner+ileg1+ileg2);"
+ " vec2 imax = max(corner, corner+ileg1);"
+ " imax = max(imax, corner+ileg2);"
+ " imax = max(imax, corner+ileg1+ileg2);"
+ // Clamp the bounds of the parallelograms to the unit square to
+ // estimate the intersection of the pixel parallelogram with
+ // the unit square. The ratio of the 2 rectangle areas is a
+ // reasonable estimate of the proportion of coverage.
+ " vec2 o1 = clamp(omin, 0.0, 1.0);"
+ " vec2 o2 = clamp(omax, 0.0, 1.0);"
+ " float oint = (o2.y-o1.y)*(o2.x-o1.x);"
+ " float oarea = (omax.y-omin.y)*(omax.x-omin.x);"
+ " vec2 i1 = clamp(imin, 0.0, 1.0);"
+ " vec2 i2 = clamp(imax, 0.0, 1.0);"
+ " float iint = (i2.y-i1.y)*(i2.x-i1.x);"
+ " float iarea = (imax.y-imin.y)*(imax.x-imin.x);"
+ // Proportion of pixel in outer shape minus the proportion
+ // of pixel in the inner shape == the coverage of the pixel
+ // in the area between the two.
+ " float coverage = oint/oarea - iint / iarea;"
+ " gl_FragColor = gl_Color * coverage;"
+ "}";
+
+#define ADJUST_PGRAM(V1, DV, V2) \
+ do { \
+ if ((DV) >= 0) { \
+ (V2) += (DV); \
+ } else { \
+ (V1) += (DV); \
+ } \
+ } while (0)
+
+// Invert the following transform:
+// DeltaT(0, 0) == (0, 0)
+// DeltaT(1, 0) == (DX1, DY1)
+// DeltaT(0, 1) == (DX2, DY2)
+// DeltaT(1, 1) == (DX1+DX2, DY1+DY2)
+// TM00 = DX1, TM01 = DX2, (TM02 = X11)
+// TM10 = DY1, TM11 = DY2, (TM12 = Y11)
+// Determinant = TM00*TM11 - TM01*TM10
+// = DX1*DY2 - DX2*DY1
+// Inverse is:
+// IM00 = TM11/det, IM01 = -TM01/det
+// IM10 = -TM10/det, IM11 = TM00/det
+// IM02 = (TM01 * TM12 - TM11 * TM02) / det,
+// IM12 = (TM10 * TM02 - TM00 * TM12) / det,
+
+#define DECLARE_MATRIX(MAT) \
+ jfloat MAT ## 00, MAT ## 01, MAT ## 02, MAT ## 10, MAT ## 11, MAT ## 12
+
+#define GET_INVERTED_MATRIX(MAT, X11, Y11, DX1, DY1, DX2, DY2, RET_CODE) \
+ do { \
+ jfloat det = DX1*DY2 - DX2*DY1; \
+ if (det == 0) { \
+ RET_CODE; \
+ } \
+ MAT ## 00 = DY2/det; \
+ MAT ## 01 = -DX2/det; \
+ MAT ## 10 = -DY1/det; \
+ MAT ## 11 = DX1/det; \
+ MAT ## 02 = (DX2 * Y11 - DY2 * X11) / det; \
+ MAT ## 12 = (DY1 * X11 - DX1 * Y11) / det; \
+ } while (0)
+
+#define TRANSFORM(MAT, TX, TY, X, Y) \
+ do { \
+ TX = (X) * MAT ## 00 + (Y) * MAT ## 01 + MAT ## 02; \
+ TY = (X) * MAT ## 10 + (Y) * MAT ## 11 + MAT ## 12; \
+ } while (0)
+
+void
+OGLRenderer_FillAAParallelogram(OGLContext *oglc, OGLSDOps *dstOps,
+ jfloat fx11, jfloat fy11,
+ jfloat dx21, jfloat dy21,
+ jfloat dx12, jfloat dy12)
+{
+ DECLARE_MATRIX(om);
+ // parameters for parallelogram bounding box
+ jfloat bx11, by11, bx22, by22;
+ // parameters for uv texture coordinates of parallelogram corners
+ jfloat u11, v11, u12, v12, u21, v21, u22, v22;
+
+ J2dTraceLn6(J2D_TRACE_INFO,
+ "OGLRenderer_FillAAParallelogram "
+ "(x=%6.2f y=%6.2f "
+ "dx1=%6.2f dy1=%6.2f "
+ "dx2=%6.2f dy2=%6.2f)",
+ fx11, fy11,
+ dx21, dy21,
+ dx12, dy12);
+
+ RETURN_IF_NULL(oglc);
+ RETURN_IF_NULL(dstOps);
+
+ GET_INVERTED_MATRIX(om, fx11, fy11, dx21, dy21, dx12, dy12,
+ return);
+
+ CHECK_PREVIOUS_OP(OGL_STATE_PGRAM_OP);
+
+ bx11 = bx22 = fx11;
+ by11 = by22 = fy11;
+ ADJUST_PGRAM(bx11, dx21, bx22);
+ ADJUST_PGRAM(by11, dy21, by22);
+ ADJUST_PGRAM(bx11, dx12, bx22);
+ ADJUST_PGRAM(by11, dy12, by22);
+ bx11 = (jfloat) floor(bx11);
+ by11 = (jfloat) floor(by11);
+ bx22 = (jfloat) ceil(bx22);
+ by22 = (jfloat) ceil(by22);
+
+ TRANSFORM(om, u11, v11, bx11, by11);
+ TRANSFORM(om, u21, v21, bx22, by11);
+ TRANSFORM(om, u12, v12, bx11, by22);
+ TRANSFORM(om, u22, v22, bx22, by22);
+
+ j2d_glBegin(GL_QUADS);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u11, v11);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 5.f, 5.f);
+ j2d_glVertex2f(bx11, by11);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u21, v21);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 6.f, 5.f);
+ j2d_glVertex2f(bx22, by11);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u22, v22);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 6.f, 6.f);
+ j2d_glVertex2f(bx22, by22);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u12, v12);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 5.f, 6.f);
+ j2d_glVertex2f(bx11, by22);
+ j2d_glEnd();
+}
+
+void
+OGLRenderer_FillAAParallelogramInnerOuter(OGLContext *oglc, OGLSDOps *dstOps,
+ jfloat ox11, jfloat oy11,
+ jfloat ox21, jfloat oy21,
+ jfloat ox12, jfloat oy12,
+ jfloat ix11, jfloat iy11,
+ jfloat ix21, jfloat iy21,
+ jfloat ix12, jfloat iy12)
+{
+ DECLARE_MATRIX(om);
+ DECLARE_MATRIX(im);
+ // parameters for parallelogram bounding box
+ jfloat bx11, by11, bx22, by22;
+ // parameters for uv texture coordinates of outer parallelogram corners
+ jfloat ou11, ov11, ou12, ov12, ou21, ov21, ou22, ov22;
+ // parameters for uv texture coordinates of inner parallelogram corners
+ jfloat iu11, iv11, iu12, iv12, iu21, iv21, iu22, iv22;
+
+ RETURN_IF_NULL(oglc);
+ RETURN_IF_NULL(dstOps);
+
+ GET_INVERTED_MATRIX(im, ix11, iy11, ix21, iy21, ix12, iy12,
+ // inner parallelogram is degenerate
+ // therefore it encloses no area
+ // fill outer
+ OGLRenderer_FillAAParallelogram(oglc, dstOps,
+ ox11, oy11,
+ ox21, oy21,
+ ox12, oy12);
+ return);
+ GET_INVERTED_MATRIX(om, ox11, oy11, ox21, oy21, ox12, oy12,
+ return);
+
+ CHECK_PREVIOUS_OP(OGL_STATE_PGRAM_OP);
+
+ bx11 = bx22 = ox11;
+ by11 = by22 = oy11;
+ ADJUST_PGRAM(bx11, ox21, bx22);
+ ADJUST_PGRAM(by11, oy21, by22);
+ ADJUST_PGRAM(bx11, ox12, bx22);
+ ADJUST_PGRAM(by11, oy12, by22);
+ bx11 = (jfloat) floor(bx11);
+ by11 = (jfloat) floor(by11);
+ bx22 = (jfloat) ceil(bx22);
+ by22 = (jfloat) ceil(by22);
+
+ TRANSFORM(om, ou11, ov11, bx11, by11);
+ TRANSFORM(om, ou21, ov21, bx22, by11);
+ TRANSFORM(om, ou12, ov12, bx11, by22);
+ TRANSFORM(om, ou22, ov22, bx22, by22);
+
+ TRANSFORM(im, iu11, iv11, bx11, by11);
+ TRANSFORM(im, iu21, iv21, bx22, by11);
+ TRANSFORM(im, iu12, iv12, bx11, by22);
+ TRANSFORM(im, iu22, iv22, bx22, by22);
+
+ j2d_glBegin(GL_QUADS);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou11, ov11);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu11, iv11);
+ j2d_glVertex2f(bx11, by11);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou21, ov21);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu21, iv21);
+ j2d_glVertex2f(bx22, by11);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou22, ov22);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu22, iv22);
+ j2d_glVertex2f(bx22, by22);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou12, ov12);
+ j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu12, iv12);
+ j2d_glVertex2f(bx11, by22);
+ j2d_glEnd();
+}
+
+void
+OGLRenderer_DrawAAParallelogram(OGLContext *oglc, OGLSDOps *dstOps,
+ jfloat fx11, jfloat fy11,
+ jfloat dx21, jfloat dy21,
+ jfloat dx12, jfloat dy12,
+ jfloat lwr21, jfloat lwr12)
+{
+ // dx,dy for line width in the "21" and "12" directions.
+ jfloat ldx21, ldy21, ldx12, ldy12;
+ // parameters for "outer" parallelogram
+ jfloat ofx11, ofy11, odx21, ody21, odx12, ody12;
+ // parameters for "inner" parallelogram
+ jfloat ifx11, ify11, idx21, idy21, idx12, idy12;
+
+ J2dTraceLn8(J2D_TRACE_INFO,
+ "OGLRenderer_DrawAAParallelogram "
+ "(x=%6.2f y=%6.2f "
+ "dx1=%6.2f dy1=%6.2f lwr1=%6.2f "
+ "dx2=%6.2f dy2=%6.2f lwr2=%6.2f)",
+ fx11, fy11,
+ dx21, dy21, lwr21,
+ dx12, dy12, lwr12);
+
+ RETURN_IF_NULL(oglc);
+ RETURN_IF_NULL(dstOps);
+
+ // calculate true dx,dy for line widths from the "line width ratios"
+ ldx21 = dx21 * lwr21;
+ ldy21 = dy21 * lwr21;
+ ldx12 = dx12 * lwr12;
+ ldy12 = dy12 * lwr12;
+
+ // calculate coordinates of the outer parallelogram
+ ofx11 = fx11 - (ldx21 + ldx12) / 2.0f;
+ ofy11 = fy11 - (ldy21 + ldy12) / 2.0f;
+ odx21 = dx21 + ldx21;
+ ody21 = dy21 + ldy21;
+ odx12 = dx12 + ldx12;
+ ody12 = dy12 + ldy12;
+
+ // Only process the inner parallelogram if the line width ratio
+ // did not consume the entire interior of the parallelogram
+ // (i.e. if the width ratio was less than 1.0)
+ if (lwr21 < 1.0f && lwr12 < 1.0f) {
+ // calculate coordinates of the inner parallelogram
+ ifx11 = fx11 + (ldx21 + ldx12) / 2.0f;
+ ify11 = fy11 + (ldy21 + ldy12) / 2.0f;
+ idx21 = dx21 - ldx21;
+ idy21 = dy21 - ldy21;
+ idx12 = dx12 - ldx12;
+ idy12 = dy12 - ldy12;
+
+ OGLRenderer_FillAAParallelogramInnerOuter(oglc, dstOps,
+ ofx11, ofy11,
+ odx21, ody21,
+ odx12, ody12,
+ ifx11, ify11,
+ idx21, idy21,
+ idx12, idy12);
+ } else {
+ OGLRenderer_FillAAParallelogram(oglc, dstOps,
+ ofx11, ofy11,
+ odx21, ody21,
+ odx12, ody12);
+ }
+}
+
+void
+OGLRenderer_EnableAAParallelogramProgram()
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_EnableAAParallelogramProgram");
+
+ if (aaPgramProgram == 0) {
+ aaPgramProgram = OGLContext_CreateFragmentProgram(aaPgramShaderSource);
+ if (aaPgramProgram == 0) {
+ J2dRlsTraceLn(J2D_TRACE_ERROR,
+ "OGLRenderer_EnableAAParallelogramProgram: "
+ "error creating program");
+ return;
+ }
+ }
+ j2d_glUseProgramObjectARB(aaPgramProgram);
+}
+
+void
+OGLRenderer_DisableAAParallelogramProgram()
+{
+ J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DisableAAParallelogramProgram");
+
+ j2d_glUseProgramObjectARB(0);
+}
+
+#endif /* !HEADLESS */