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Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c')
-rw-r--r--nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c801
1 files changed, 801 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c
new file mode 100644
index 000000000..05f81c690
--- /dev/null
+++ b/nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c
@@ -0,0 +1,801 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.4
+ *
+ * Copyright (C) 1999-2005 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 "glheader.h"
+#include "context.h"
+#include "colormac.h"
+#include "convolve.h"
+#include "histogram.h"
+#include "image.h"
+#include "macros.h"
+#include "imports.h"
+#include "pixel.h"
+
+#include "s_context.h"
+#include "s_depth.h"
+#include "s_pixeltex.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_texture.h"
+#include "s_zoom.h"
+
+
+
+/*
+ * Determine if there's overlap in an image copy.
+ * This test also compensates for the fact that copies are done from
+ * bottom to top and overlaps can sometimes be handled correctly
+ * without making a temporary image copy.
+ */
+static GLboolean
+regions_overlap(GLint srcx, GLint srcy,
+ GLint dstx, GLint dsty,
+ GLint width, GLint height,
+ GLfloat zoomX, GLfloat zoomY)
+{
+ if (zoomX == 1.0 && zoomY == 1.0) {
+ /* no zoom */
+ if (srcx >= dstx + width || (srcx + width <= dstx)) {
+ return GL_FALSE;
+ }
+ else if (srcy < dsty) { /* this is OK */
+ return GL_FALSE;
+ }
+ else if (srcy > dsty + height) {
+ return GL_FALSE;
+ }
+ else {
+ return GL_TRUE;
+ }
+ }
+ else {
+ /* add one pixel of slop when zooming, just to be safe */
+ if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
+ return GL_FALSE;
+ }
+ else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
+ return GL_FALSE;
+ }
+ else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
+ return GL_FALSE;
+ }
+ else {
+ return GL_TRUE;
+ }
+ }
+}
+
+
+/**
+ * Convert GLfloat[n][4] colors to GLchan[n][4].
+ * XXX maybe move into image.c
+ */
+static void
+float_span_to_chan(GLuint n, CONST GLfloat in[][4], GLchan out[][4])
+{
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ UNCLAMPED_FLOAT_TO_CHAN(out[i][RCOMP], in[i][RCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(out[i][GCOMP], in[i][GCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(out[i][BCOMP], in[i][BCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(out[i][ACOMP], in[i][ACOMP]);
+ }
+}
+
+
+/**
+ * Convert GLchan[n][4] colors to GLfloat[n][4].
+ * XXX maybe move into image.c
+ */
+static void
+chan_span_to_float(GLuint n, CONST GLchan in[][4], GLfloat out[][4])
+{
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ out[i][RCOMP] = CHAN_TO_FLOAT(in[i][RCOMP]);
+ out[i][GCOMP] = CHAN_TO_FLOAT(in[i][GCOMP]);
+ out[i][BCOMP] = CHAN_TO_FLOAT(in[i][BCOMP]);
+ out[i][ACOMP] = CHAN_TO_FLOAT(in[i][ACOMP]);
+ }
+}
+
+
+
+/*
+ * RGBA copypixels with convolution.
+ */
+static void
+copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height, GLint destx, GLint desty)
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ struct gl_renderbuffer *drawRb = NULL;
+ GLboolean quick_draw;
+ GLint row;
+ GLboolean changeBuffer;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ const GLuint transferOps = ctx->_ImageTransferState;
+ GLfloat *dest, *tmpImage, *convImage;
+ struct sw_span span;
+
+ INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
+
+ if (ctx->Depth.Test)
+ _swrast_span_default_z(ctx, &span);
+ if (swrast->_FogEnabled)
+ _swrast_span_default_fog(ctx, &span);
+
+
+ if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
+ && !zoom
+ && destx >= 0
+ && destx + width <= (GLint) ctx->DrawBuffer->Width) {
+ quick_draw = GL_TRUE;
+ drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
+ }
+ else {
+ quick_draw = GL_FALSE;
+ }
+
+ /* If read and draw buffer are different we must do buffer switching */
+ changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer[0]
+ || ctx->DrawBuffer != ctx->ReadBuffer;
+
+
+ /* allocate space for GLfloat image */
+ tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+ if (!tmpImage) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+ return;
+ }
+ convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+ if (!convImage) {
+ FREE(tmpImage);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+ return;
+ }
+
+ if (changeBuffer) {
+ /* choose the read buffer */
+ _swrast_use_read_buffer(ctx);
+ }
+
+ /* read source image */
+ dest = tmpImage;
+ for (row = 0; row < height; row++) {
+ GLchan rgba[MAX_WIDTH][4];
+ /* Read GLchan and convert to GLfloat */
+ _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
+ width, srcx, srcy + row, rgba);
+ chan_span_to_float(width, (CONST GLchan (*)[4]) rgba,
+ (GLfloat (*)[4]) dest);
+ dest += 4 * width;
+ }
+
+ if (changeBuffer) {
+ /* restore default src/dst buffer */
+ _swrast_use_draw_buffer(ctx);
+ }
+
+ /* do the image transfer ops which preceed convolution */
+ for (row = 0; row < height; row++) {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
+ _mesa_apply_rgba_transfer_ops(ctx,
+ transferOps & IMAGE_PRE_CONVOLUTION_BITS,
+ width, rgba);
+ }
+
+ /* do convolution */
+ if (ctx->Pixel.Convolution2DEnabled) {
+ _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
+ }
+ else {
+ ASSERT(ctx->Pixel.Separable2DEnabled);
+ _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
+ }
+ FREE(tmpImage);
+
+ /* do remaining post-convolution image transfer ops */
+ for (row = 0; row < height; row++) {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
+ _mesa_apply_rgba_transfer_ops(ctx,
+ transferOps & IMAGE_POST_CONVOLUTION_BITS,
+ width, rgba);
+ }
+
+ /* write the new image */
+ for (row = 0; row < height; row++) {
+ const GLfloat *src = convImage + row * width * 4;
+ GLint dy;
+
+ /* convert floats back to chan */
+ float_span_to_chan(width, (const GLfloat (*)[4]) src, span.array->rgba);
+
+ if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._EnabledUnits) {
+ span.end = width;
+ _swrast_pixel_texture(ctx, &span);
+ }
+
+ /* write row to framebuffer */
+
+ dy = desty + row;
+ if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
+ drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
+ }
+ else if (zoom) {
+ span.x = destx;
+ span.y = dy;
+ span.end = width;
+ _swrast_write_zoomed_rgba_span(ctx, &span,
+ (CONST GLchan (*)[4])span.array->rgba,
+ desty, 0);
+ }
+ else {
+ span.x = destx;
+ span.y = dy;
+ span.end = width;
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ }
+
+ FREE(convImage);
+}
+
+
+/*
+ * RGBA copypixels
+ */
+static void
+copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height, GLint destx, GLint desty)
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ struct gl_renderbuffer *drawRb;
+ GLchan *tmpImage,*p;
+ GLboolean quick_draw;
+ GLint sy, dy, stepy, j;
+ GLboolean changeBuffer;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ GLint overlapping;
+ const GLuint transferOps = ctx->_ImageTransferState;
+ struct sw_span span;
+
+ if (!ctx->ReadBuffer->_ColorReadBuffer) {
+ /* no readbuffer - OK */
+ return;
+ }
+
+ INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
+
+ if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+ copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
+ return;
+ }
+
+ /* Determine if copy should be done bottom-to-top or top-to-bottom */
+ if (srcy < desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ if (ctx->DrawBuffer == ctx->ReadBuffer) {
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+ }
+ else {
+ overlapping = GL_FALSE;
+ }
+
+ if (ctx->Depth.Test)
+ _swrast_span_default_z(ctx, &span);
+ if (swrast->_FogEnabled)
+ _swrast_span_default_fog(ctx, &span);
+
+ if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
+ && !zoom
+ && destx >= 0
+ && destx + width <= (GLint) ctx->DrawBuffer->Width) {
+ quick_draw = GL_TRUE;
+ drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
+ }
+ else {
+ quick_draw = GL_FALSE;
+ drawRb = NULL;
+ }
+
+ /* If read and draw buffer are different we must do buffer switching */
+ changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer[0]
+ || ctx->DrawBuffer != ctx->ReadBuffer;
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
+ if (!tmpImage) {
+ _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ /* setup source */
+ if (changeBuffer)
+ _swrast_use_read_buffer(ctx);
+ /* read the source image */
+ p = tmpImage;
+ for (j = 0; j < height; j++, ssy += stepy) {
+ _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+ width, srcx, ssy, (GLchan (*)[4]) p );
+ p += width * 4;
+ }
+ p = tmpImage;
+ /* restore dest */
+ if (changeBuffer) {
+ _swrast_use_draw_buffer(ctx);
+ changeBuffer = GL_FALSE;
+ }
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warnings */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ /* Get source pixels */
+ if (overlapping) {
+ /* get from buffered image */
+ ASSERT(width < MAX_WIDTH);
+ MEMCPY(span.array->rgba, p, width * sizeof(GLchan) * 4);
+ p += width * 4;
+ }
+ else {
+ /* get from framebuffer */
+ if (changeBuffer)
+ _swrast_use_read_buffer(ctx);
+ ASSERT(width < MAX_WIDTH);
+ _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+ width, srcx, sy, span.array->rgba );
+ if (changeBuffer)
+ _swrast_use_draw_buffer(ctx);
+ }
+
+ if (transferOps) {
+ DEFMARRAY(GLfloat, rgbaFloat, MAX_WIDTH, 4); /* mac 32k limitation */
+ CHECKARRAY(rgbaFloat, return);
+
+ /* convert to float, transfer, convert back to chan */
+ chan_span_to_float(width, (CONST GLchan (*)[4]) span.array->rgba,
+ rgbaFloat);
+ _mesa_apply_rgba_transfer_ops(ctx, transferOps, width, rgbaFloat);
+ float_span_to_chan(width, (CONST GLfloat (*)[4]) rgbaFloat,
+ span.array->rgba);
+
+ UNDEFARRAY(rgbaFloat); /* mac 32k limitation */
+ }
+
+ if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._EnabledUnits) {
+ span.end = width;
+ _swrast_pixel_texture(ctx, &span);
+ }
+
+ /* Write color span */
+ if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
+ drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
+ }
+ else if (zoom) {
+ span.x = destx;
+ span.y = dy;
+ span.end = width;
+ _swrast_write_zoomed_rgba_span(ctx, &span,
+ (CONST GLchan (*)[4]) span.array->rgba,
+ desty, 0);
+ }
+ else {
+ span.x = destx;
+ span.y = dy;
+ span.end = width;
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+static void
+copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height,
+ GLint destx, GLint desty )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ GLuint *tmpImage,*p;
+ GLint sy, dy, stepy;
+ GLint j;
+ GLboolean changeBuffer;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+ GLint overlapping;
+ struct sw_span span;
+
+ if (!ctx->ReadBuffer->_ColorReadBuffer) {
+ /* no readbuffer - OK */
+ return;
+ }
+
+ INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
+
+ /* Determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcy<desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ if (ctx->DrawBuffer == ctx->ReadBuffer) {
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+ }
+ else {
+ overlapping = GL_FALSE;
+ }
+
+ if (ctx->Depth.Test)
+ _swrast_span_default_z(ctx, &span);
+ if (swrast->_FogEnabled)
+ _swrast_span_default_fog(ctx, &span);
+
+ /* If read and draw buffer are different we must do buffer switching */
+ changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer[0]
+ || ctx->DrawBuffer != ctx->ReadBuffer;
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
+ if (!tmpImage) {
+ _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ /* setup source */
+ if (changeBuffer)
+ _swrast_use_read_buffer(ctx);
+ /* read the image */
+ p = tmpImage;
+ for (j = 0; j < height; j++, ssy += stepy) {
+ _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+ width, srcx, ssy, p );
+ p += width;
+ }
+ p = tmpImage;
+ /* restore to draw buffer */
+ if (changeBuffer) {
+ _swrast_use_draw_buffer(ctx);
+ changeBuffer = GL_FALSE;
+ }
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warning */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ /* Get color indexes */
+ if (overlapping) {
+ MEMCPY(span.array->index, p, width * sizeof(GLuint));
+ p += width;
+ }
+ else {
+ if (changeBuffer)
+ _swrast_use_read_buffer(ctx);
+ _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+ width, srcx, sy, span.array->index );
+ if (changeBuffer)
+ _swrast_use_draw_buffer(ctx);
+ }
+
+ /* Apply shift, offset, look-up table */
+ if (shift_or_offset) {
+ _mesa_shift_and_offset_ci( ctx, width, span.array->index );
+ }
+ if (ctx->Pixel.MapColorFlag) {
+ _mesa_map_ci( ctx, width, span.array->index );
+ }
+
+ /* write color indexes */
+ span.x = destx;
+ span.y = dy;
+ span.end = width;
+ if (zoom)
+ _swrast_write_zoomed_index_span(ctx, &span, desty, 0);
+ else
+ _swrast_write_index_span(ctx, &span);
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+
+/*
+ * TODO: Optimize!!!!
+ */
+static void
+copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height,
+ GLint destx, GLint desty )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
+ struct gl_renderbuffer *readRb
+ = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+ GLfloat *p, *tmpImage;
+ GLint sy, dy, stepy;
+ GLint i, j;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ GLint overlapping;
+ struct sw_span span;
+
+ if (!readRb) {
+ /* no readbuffer - OK */
+ return;
+ }
+
+ INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
+
+ if (!ctx->Visual.depthBits) {
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+ return;
+ }
+
+ /* Determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcy<desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ if (ctx->DrawBuffer == ctx->ReadBuffer) {
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+ }
+ else {
+ overlapping = GL_FALSE;
+ }
+
+ _swrast_span_default_color(ctx, &span);
+ if (swrast->_FogEnabled)
+ _swrast_span_default_fog(ctx, &span);
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
+ if (!tmpImage) {
+ _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ p = tmpImage;
+ for (j = 0; j < height; j++, ssy += stepy) {
+ _swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
+ p += width;
+ }
+ p = tmpImage;
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warning */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ GLfloat depth[MAX_WIDTH];
+ /* get depth values */
+ if (overlapping) {
+ MEMCPY(depth, p, width * sizeof(GLfloat));
+ p += width;
+ }
+ else {
+ _swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
+ }
+
+ /* apply scale and bias */
+ for (i = 0; i < width; i++) {
+ GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
+ span.array->z[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * depthMax);
+ }
+
+ /* write depth values */
+ span.x = destx;
+ span.y = dy;
+ span.end = width;
+ if (ctx->Visual.rgbMode) {
+ if (zoom)
+ _swrast_write_zoomed_rgba_span( ctx, &span,
+ (const GLchan (*)[4])span.array->rgba, desty, 0 );
+ else
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ else {
+ if (zoom)
+ _swrast_write_zoomed_index_span( ctx, &span, desty, 0 );
+ else
+ _swrast_write_index_span(ctx, &span);
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+
+static void
+copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height,
+ GLint destx, GLint desty )
+{
+ struct gl_renderbuffer *rb
+ = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+ GLint sy, dy, stepy;
+ GLint j;
+ GLstencil *p, *tmpImage;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+ GLint overlapping;
+
+ if (!ctx->Visual.stencilBits) {
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+ return;
+ }
+
+ if (!rb) {
+ /* no readbuffer - OK */
+ return;
+ }
+
+ /* Determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcy < desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ if (ctx->DrawBuffer == ctx->ReadBuffer) {
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+ }
+ else {
+ overlapping = GL_FALSE;
+ }
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
+ if (!tmpImage) {
+ _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ p = tmpImage;
+ for (j = 0; j < height; j++, ssy += stepy) {
+ _swrast_read_stencil_span( ctx, rb, width, srcx, ssy, p );
+ p += width;
+ }
+ p = tmpImage;
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warning */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ GLstencil stencil[MAX_WIDTH];
+
+ /* Get stencil values */
+ if (overlapping) {
+ MEMCPY(stencil, p, width * sizeof(GLstencil));
+ p += width;
+ }
+ else {
+ _swrast_read_stencil_span( ctx, rb, width, srcx, sy, stencil );
+ }
+
+ /* Apply shift, offset, look-up table */
+ if (shift_or_offset) {
+ _mesa_shift_and_offset_stencil( ctx, width, stencil );
+ }
+ if (ctx->Pixel.MapStencilFlag) {
+ _mesa_map_stencil( ctx, width, stencil );
+ }
+
+ /* Write stencil values */
+ if (zoom) {
+ _swrast_write_zoomed_stencil_span( ctx, width, destx, dy,
+ stencil, desty, 0 );
+ }
+ else {
+ _swrast_write_stencil_span( ctx, width, destx, dy, stencil );
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+
+void
+_swrast_CopyPixels( GLcontext *ctx,
+ GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+ GLint destx, GLint desty,
+ GLenum type )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ RENDER_START(swrast,ctx);
+
+ if (swrast->NewState)
+ _swrast_validate_derived( ctx );
+
+ if (type == GL_COLOR && ctx->Visual.rgbMode) {
+ copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else if (type == GL_COLOR && !ctx->Visual.rgbMode) {
+ copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else if (type == GL_DEPTH) {
+ copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else if (type == GL_STENCIL) {
+ copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
+ }
+
+ RENDER_FINISH(swrast,ctx);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-10 15:26:32 +0000