* Compute the bounds of the region resulting from zooming a pixel span.
* The resulting region will be entirely inside the window/scissor bounds
* so no additional clipping is needed.
- * \param imageX, imageY position of the overall image being drawn
+ * \param imageX, imageY position of the mage being drawn (gl WindowPos)
* \param spanX, spanY position of span being drawing
+ * \param width number of pixels in span
* \param x0, x1 returned X bounds of zoomed region [x0, x1)
* \param y0, y1 returned Y bounds of zoomed region [y0, y1)
* \return GL_TRUE if any zoomed pixels visible, GL_FALSE if totally clipped
/**
- * Can use this for unzooming X or Y values.
+ * Convert a zoomed x image coordinate back to an unzoomed x coord.
+ * 'zx' is screen position of a pixel in the zoomed image, who's left edge
+ * is at 'imageX'.
+ * return corresponding x coord in the original, unzoomed image.
+ * This can use this for unzooming X or Y values.
*/
static INLINE GLint
unzoom_x(GLfloat zoomX, GLint imageX, GLint zx)
zx - imageX = (x - imageX) * zoomX;
(zx - imageX) / zoomX = x - imageX;
*/
- GLint x = imageX + (GLint) ((zx - imageX) / zoomX);
+ GLint x;
+ if (zoomX < 0.0)
+ zx++;
+ x = imageX + (GLint) ((zx - imageX) / zoomX);
return x;
}
ASSERT((span->arrayMask & SPAN_XY) == 0);
ASSERT(span->primitive == GL_BITMAP);
- INIT_SPAN(zoomed, GL_BITMAP, 0, 0, 0);
+ INIT_SPAN(zoomed, GL_BITMAP);
zoomed.x = x0;
zoomed.end = zoomedWidth;
zoomed.array = &zoomed_arrays;
zoomed_arrays.ChanType = span->array->ChanType;
- /* XXX temporary */
-#if CHAN_TYPE == GL_UNSIGNED_BYTE
- zoomed_arrays.rgba = zoomed_arrays.color.sz1.rgba;
- zoomed_arrays.spec = zoomed_arrays.color.sz1.spec;
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- zoomed_arrays.rgba = zoomed_arrays.color.sz2.rgba;
- zoomed_arrays.spec = zoomed_arrays.color.sz2.spec;
-#else
- zoomed_arrays.rgba = zoomed_arrays.color.sz4.rgba;
- zoomed_arrays.spec = zoomed_arrays.color.sz4.spec;
-#endif
-
-
- /* copy fog interp info */
+ if (zoomed_arrays.ChanType == GL_UNSIGNED_BYTE)
+ zoomed_arrays.rgba = (GLchan (*)[4]) zoomed_arrays.rgba8;
+ else if (zoomed_arrays.ChanType == GL_UNSIGNED_SHORT)
+ zoomed_arrays.rgba = (GLchan (*)[4]) zoomed_arrays.rgba16;
+ else
+ zoomed_arrays.rgba = (GLchan (*)[4]) zoomed_arrays.attribs[FRAG_ATTRIB_COL0];
+
+ COPY_4V(zoomed.attrStart[FRAG_ATTRIB_WPOS], span->attrStart[FRAG_ATTRIB_WPOS]);
+ COPY_4V(zoomed.attrStepX[FRAG_ATTRIB_WPOS], span->attrStepX[FRAG_ATTRIB_WPOS]);
+ COPY_4V(zoomed.attrStepY[FRAG_ATTRIB_WPOS], span->attrStepY[FRAG_ATTRIB_WPOS]);
+
zoomed.attrStart[FRAG_ATTRIB_FOGC][0] = span->attrStart[FRAG_ATTRIB_FOGC][0];
zoomed.attrStepX[FRAG_ATTRIB_FOGC][0] = span->attrStepX[FRAG_ATTRIB_FOGC][0];
zoomed.attrStepY[FRAG_ATTRIB_FOGC][0] = span->attrStepY[FRAG_ATTRIB_FOGC][0];
- /* XXX copy texcoord info? */
if (format == GL_RGBA || format == GL_RGB) {
/* copy Z info */
/* we'll generate an array of colorss */
zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
zoomed.arrayMask |= SPAN_RGBA;
+ zoomed.arrayAttribs |= FRAG_BIT_COL0; /* we'll produce these values */
ASSERT(span->arrayMask & SPAN_RGBA);
}
else if (format == GL_COLOR_INDEX) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
- COPY_4UBV(zoomed.array->color.sz1.rgba[i], rgba[j]);
+ COPY_4UBV(zoomed.array->rgba8[i], rgba[j]);
}
}
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
- COPY_4V(zoomed.array->color.sz2.rgba[i], rgba[j]);
+ COPY_4V(zoomed.array->rgba16[i], rgba[j]);
}
}
else {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
- zoomed.array->color.sz1.rgba[i][0] = rgb[j][0];
- zoomed.array->color.sz1.rgba[i][1] = rgb[j][1];
- zoomed.array->color.sz1.rgba[i][2] = rgb[j][2];
- zoomed.array->color.sz1.rgba[i][3] = 0xff;
+ zoomed.array->rgba8[i][0] = rgb[j][0];
+ zoomed.array->rgba8[i][1] = rgb[j][1];
+ zoomed.array->rgba8[i][2] = rgb[j][2];
+ zoomed.array->rgba8[i][3] = 0xff;
}
}
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
- zoomed.array->color.sz2.rgba[i][0] = rgb[j][0];
- zoomed.array->color.sz2.rgba[i][1] = rgb[j][1];
- zoomed.array->color.sz2.rgba[i][2] = rgb[j][2];
- zoomed.array->color.sz2.rgba[i][3] = 0xffff;
+ zoomed.array->rgba16[i][0] = rgb[j][0];
+ zoomed.array->rgba16[i][1] = rgb[j][1];
+ zoomed.array->rgba16[i][2] = rgb[j][2];
+ zoomed.array->rgba16[i][3] = 0xffff;
}
}
else {
* Also, clipping may change the span end value, so store it as well.
*/
const GLint end = zoomed.end; /* save */
- /* use specular color array for temp storage */
- void *rgbaSave = zoomed.array->spec;
+ GLuint rgbaSave[MAX_WIDTH][4];
const GLint pixelSize =
(zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :
((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)
}
else if (format == GL_COLOR_INDEX) {
/* use specular color array for temp storage */
- GLuint *indexSave = (GLuint *) zoomed.array->spec;
+ GLuint *indexSave = (GLuint *) zoomed.array->attribs[FRAG_ATTRIB_FOGC];
const GLint end = zoomed.end; /* save */
if (y1 - y0 > 1) {
MEMCPY(indexSave, zoomed.array->index, zoomed.end * sizeof(GLuint));
projects / mesa.git / blobdiff