+++ /dev/null
-/*
- * Mesa 3-D graphics library
- * Version: 7.1
- *
- * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-#include <precomp.h>
-
-/**
- * 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 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
- */
-static GLboolean
-compute_zoomed_bounds(struct gl_context *ctx, GLint imageX, GLint imageY,
- GLint spanX, GLint spanY, GLint width,
- GLint *x0, GLint *x1, GLint *y0, GLint *y1)
-{
- const struct gl_framebuffer *fb = ctx->DrawBuffer;
- GLint c0, c1, r0, r1;
-
- ASSERT(spanX >= imageX);
- ASSERT(spanY >= imageY);
-
- /*
- * Compute destination columns: [c0, c1)
- */
- c0 = imageX + (GLint) ((spanX - imageX) * ctx->Pixel.ZoomX);
- c1 = imageX + (GLint) ((spanX + width - imageX) * ctx->Pixel.ZoomX);
- if (c1 < c0) {
- /* swap */
- GLint tmp = c1;
- c1 = c0;
- c0 = tmp;
- }
- c0 = CLAMP(c0, fb->_Xmin, fb->_Xmax);
- c1 = CLAMP(c1, fb->_Xmin, fb->_Xmax);
- if (c0 == c1) {
- return GL_FALSE; /* no width */
- }
-
- /*
- * Compute destination rows: [r0, r1)
- */
- r0 = imageY + (GLint) ((spanY - imageY) * ctx->Pixel.ZoomY);
- r1 = imageY + (GLint) ((spanY + 1 - imageY) * ctx->Pixel.ZoomY);
- if (r1 < r0) {
- /* swap */
- GLint tmp = r1;
- r1 = r0;
- r0 = tmp;
- }
- r0 = CLAMP(r0, fb->_Ymin, fb->_Ymax);
- r1 = CLAMP(r1, fb->_Ymin, fb->_Ymax);
- if (r0 == r1) {
- return GL_FALSE; /* no height */
- }
-
- *x0 = c0;
- *x1 = c1;
- *y0 = r0;
- *y1 = r1;
-
- return GL_TRUE;
-}
-
-
-/**
- * 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 = (x - imageX) * zoomX;
- (zx - imageX) / zoomX = x - imageX;
- */
- GLint x;
- if (zoomX < 0.0)
- zx++;
- x = imageX + (GLint) ((zx - imageX) / zoomX);
- return x;
-}
-
-
-
-/**
- * Helper function called from _swrast_write_zoomed_rgba/rgb/
- * index/depth_span().
- */
-static void
-zoom_span( struct gl_context *ctx, GLint imgX, GLint imgY, const SWspan *span,
- const GLvoid *src, GLenum format )
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
- SWspan zoomed;
- GLint x0, x1, y0, y1;
- GLint zoomedWidth;
-
- if (!compute_zoomed_bounds(ctx, imgX, imgY, span->x, span->y, span->end,
- &x0, &x1, &y0, &y1)) {
- return; /* totally clipped */
- }
-
- if (!swrast->ZoomedArrays) {
- /* allocate on demand */
- swrast->ZoomedArrays = (SWspanarrays *) CALLOC(sizeof(SWspanarrays));
- if (!swrast->ZoomedArrays)
- return;
- }
-
- zoomedWidth = x1 - x0;
- ASSERT(zoomedWidth > 0);
- ASSERT(zoomedWidth <= MAX_WIDTH);
-
- /* no pixel arrays! must be horizontal spans. */
- ASSERT((span->arrayMask & SPAN_XY) == 0);
- ASSERT(span->primitive == GL_BITMAP);
-
- INIT_SPAN(zoomed, GL_BITMAP);
- zoomed.x = x0;
- zoomed.end = zoomedWidth;
- zoomed.array = swrast->ZoomedArrays;
- zoomed.array->ChanType = span->array->ChanType;
- if (zoomed.array->ChanType == GL_UNSIGNED_BYTE)
- zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8;
- else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT)
- zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16;
- else
- zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[FRAG_ATTRIB_COL];
-
- 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];
-
- if (format == GL_RGBA || format == GL_RGB) {
- /* copy Z info */
- zoomed.z = span->z;
- zoomed.zStep = span->zStep;
- /* we'll generate an array of colorss */
- zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
- zoomed.arrayMask |= SPAN_RGBA;
- zoomed.arrayAttribs |= FRAG_BIT_COL; /* we'll produce these values */
- ASSERT(span->arrayMask & SPAN_RGBA);
- }
- else if (format == GL_DEPTH_COMPONENT) {
- /* Copy color info */
- zoomed.red = span->red;
- zoomed.green = span->green;
- zoomed.blue = span->blue;
- zoomed.alpha = span->alpha;
- zoomed.redStep = span->redStep;
- zoomed.greenStep = span->greenStep;
- zoomed.blueStep = span->blueStep;
- zoomed.alphaStep = span->alphaStep;
- /* we'll generate an array of depth values */
- zoomed.interpMask = span->interpMask & ~SPAN_Z;
- zoomed.arrayMask |= SPAN_Z;
- ASSERT(span->arrayMask & SPAN_Z);
- }
- else {
- _mesa_problem(ctx, "Bad format in zoom_span");
- return;
- }
-
- /* zoom the span horizontally */
- if (format == GL_RGBA) {
- if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
- const GLubyte (*rgba)[4] = (const GLubyte (*)[4]) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < (GLint) span->end);
- COPY_4UBV(zoomed.array->rgba8[i], rgba[j]);
- }
- }
- else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
- const GLushort (*rgba)[4] = (const GLushort (*)[4]) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < (GLint) span->end);
- COPY_4V(zoomed.array->rgba16[i], rgba[j]);
- }
- }
- else {
- const GLfloat (*rgba)[4] = (const GLfloat (*)[4]) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < span->end);
- COPY_4V(zoomed.array->attribs[FRAG_ATTRIB_COL][i], rgba[j]);
- }
- }
- }
- else if (format == GL_RGB) {
- if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
- const GLubyte (*rgb)[3] = (const GLubyte (*)[3]) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < (GLint) span->end);
- 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) {
- const GLushort (*rgb)[3] = (const GLushort (*)[3]) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < (GLint) span->end);
- 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 {
- const GLfloat (*rgb)[3] = (const GLfloat (*)[3]) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < span->end);
- zoomed.array->attribs[FRAG_ATTRIB_COL][i][0] = rgb[j][0];
- zoomed.array->attribs[FRAG_ATTRIB_COL][i][1] = rgb[j][1];
- zoomed.array->attribs[FRAG_ATTRIB_COL][i][2] = rgb[j][2];
- zoomed.array->attribs[FRAG_ATTRIB_COL][i][3] = 1.0F;
- }
- }
- }
- else if (format == GL_DEPTH_COMPONENT) {
- const GLuint *zValues = (const GLuint *) src;
- GLint i;
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
- ASSERT(j >= 0);
- ASSERT(j < (GLint) span->end);
- zoomed.array->z[i] = zValues[j];
- }
- /* Now, fall into the RGB path below */
- format = GL_RGBA;
- }
-
- /* write the span in rows [r0, r1) */
- if (format == GL_RGBA || format == GL_RGB) {
- /* Writing the span may modify the colors, so make a backup now if we're
- * going to call _swrast_write_zoomed_span() more than once.
- * Also, clipping may change the span end value, so store it as well.
- */
- const GLint end = zoomed.end; /* save */
- void *rgbaSave;
- const GLint pixelSize =
- (zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :
- ((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)
- : 4 * sizeof(GLfloat));
-
- rgbaSave = malloc(zoomed.end * pixelSize);
- if (!rgbaSave) {
- return;
- }
-
- if (y1 - y0 > 1) {
- memcpy(rgbaSave, zoomed.array->rgba, zoomed.end * pixelSize);
- }
- for (zoomed.y = y0; zoomed.y < y1; zoomed.y++) {
- _swrast_write_rgba_span(ctx, &zoomed);
- zoomed.end = end; /* restore */
- if (y1 - y0 > 1) {
- /* restore the colors */
- memcpy(zoomed.array->rgba, rgbaSave, zoomed.end * pixelSize);
- }
- }
-
- free(rgbaSave);
- }
-}
-
-
-void
-_swrast_write_zoomed_rgba_span(struct gl_context *ctx, GLint imgX, GLint imgY,
- const SWspan *span, const GLvoid *rgba)
-{
- zoom_span(ctx, imgX, imgY, span, rgba, GL_RGBA);
-}
-
-
-void
-_swrast_write_zoomed_rgb_span(struct gl_context *ctx, GLint imgX, GLint imgY,
- const SWspan *span, const GLvoid *rgb)
-{
- zoom_span(ctx, imgX, imgY, span, rgb, GL_RGB);
-}
-
-
-void
-_swrast_write_zoomed_depth_span(struct gl_context *ctx, GLint imgX, GLint imgY,
- const SWspan *span)
-{
- zoom_span(ctx, imgX, imgY, span,
- (const GLvoid *) span->array->z, GL_DEPTH_COMPONENT);
-}
-
-
-/**
- * Zoom/write stencil values.
- * No per-fragment operations are applied.
- */
-void
-_swrast_write_zoomed_stencil_span(struct gl_context *ctx, GLint imgX, GLint imgY,
- GLint width, GLint spanX, GLint spanY,
- const GLubyte stencil[])
-{
- GLubyte zoomedVals[MAX_WIDTH];
- GLint x0, x1, y0, y1, y;
- GLint i, zoomedWidth;
-
- if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
- &x0, &x1, &y0, &y1)) {
- return; /* totally clipped */
- }
-
- zoomedWidth = x1 - x0;
- ASSERT(zoomedWidth > 0);
- ASSERT(zoomedWidth <= MAX_WIDTH);
-
- /* zoom the span horizontally */
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
- ASSERT(j >= 0);
- ASSERT(j < width);
- zoomedVals[i] = stencil[j];
- }
-
- /* write the zoomed spans */
- for (y = y0; y < y1; y++) {
- _swrast_write_stencil_span(ctx, zoomedWidth, x0, y, zoomedVals);
- }
-}
-
-
-/**
- * Zoom/write 32-bit Z values.
- * No per-fragment operations are applied.
- */
-void
-_swrast_write_zoomed_z_span(struct gl_context *ctx, GLint imgX, GLint imgY,
- GLint width, GLint spanX, GLint spanY,
- const GLuint *zVals)
-{
- struct gl_renderbuffer *rb =
- ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
- GLuint zoomedVals[MAX_WIDTH];
- GLint x0, x1, y0, y1, y;
- GLint i, zoomedWidth;
-
- if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
- &x0, &x1, &y0, &y1)) {
- return; /* totally clipped */
- }
-
- zoomedWidth = x1 - x0;
- ASSERT(zoomedWidth > 0);
- ASSERT(zoomedWidth <= MAX_WIDTH);
-
- /* zoom the span horizontally */
- for (i = 0; i < zoomedWidth; i++) {
- GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
- ASSERT(j >= 0);
- ASSERT(j < width);
- zoomedVals[i] = zVals[j];
- }
-
- /* write the zoomed spans */
- for (y = y0; y < y1; y++) {
- GLubyte *dst = _swrast_pixel_address(rb, x0, y);
- _mesa_pack_uint_z_row(rb->Format, zoomedWidth, zoomedVals, dst);
- }
-}
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