/*
* Draw color index image.
*/
static void
draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLint imgX = x, imgY = y;
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
GLint row, skipPixels;
SWspan span;
INIT_SPAN(span, GL_BITMAP);
span.arrayMask = SPAN_INDEX;
_swrast_span_default_attribs(ctx, &span);
/*
* General solution
*/
skipPixels = 0;
while (skipPixels < width) {
const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
ASSERT(spanWidth <= MAX_WIDTH);
for (row = 0; row < height; row++) {
const GLvoid *source = _mesa_image_address2d(unpack, pixels,
width, height,
GL_COLOR_INDEX, type,
row, skipPixels);
_mesa_unpack_index_span(ctx, spanWidth, GL_UNSIGNED_INT,
span.array->index, type, source, unpack,
ctx->_ImageTransferState);
/* These may get changed during writing/clipping */
span.x = x + skipPixels;
span.y = y + row;
span.end = spanWidth;
if (zoom)
_swrast_write_zoomed_index_span(ctx, imgX, imgY, &span);
else
_swrast_write_index_span(ctx, &span);
}
skipPixels += spanWidth;
}
}
/*
* Draw depth image.
*/
static void
draw_depth_pixels( struct gl_context *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLboolean scaleOrBias
= ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
SWspan span;
INIT_SPAN(span, GL_BITMAP);
span.arrayMask = SPAN_Z;
_swrast_span_default_attribs(ctx, &span);
if (type == GL_UNSIGNED_SHORT
&& ctx->DrawBuffer->Visual.depthBits == 16
&& !scaleOrBias
&& !zoom
&& width <= SWRAST_MAX_WIDTH
&& !unpack->SwapBytes) {
/* Special case: directly write 16-bit depth values */
GLint row;
for (row = 0; row < height; row++) {
const GLushort *zSrc = (const GLushort *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
GLint i;
for (i = 0; i < width; i++)
span.array->z[i] = zSrc[i];
span.x = x;
span.y = y + row;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else if (type == GL_UNSIGNED_INT
&& !scaleOrBias
&& !zoom
&& width <= SWRAST_MAX_WIDTH
&& !unpack->SwapBytes) {
/* Special case: shift 32-bit values down to Visual.depthBits */
const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
GLint row;
for (row = 0; row < height; row++) {
const GLuint *zSrc = (const GLuint *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
if (shift == 0) {
memcpy(span.array->z, zSrc, width * sizeof(GLuint));
}
else {
GLint col;
for (col = 0; col < width; col++)
span.array->z[col] = zSrc[col] >> shift;
}
span.x = x;
span.y = y + row;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else {
/**
* Render a bitmap.
* Called via ctx->Driver.Bitmap()
* All parameter error checking will have been done before this is called.
*/
void
_swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap )
{
GLint row, col;
GLuint count = 0;
SWspan span;
ASSERT(ctx->RenderMode == GL_RENDER);
if (!_mesa_check_conditional_render(ctx))
return; /* don't draw */
bitmap = (const GLubyte *) _mesa_map_pbo_source(ctx, unpack, bitmap);
if (!bitmap)
return;
swrast_render_start(ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_XY;
_swrast_span_default_attribs(ctx, &span);
for (row = 0; row < height; row++) {
const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
if (*src & mask) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
if (*src & mask) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
/* get ready for next row */
if (mask != 128)
src++;
}
if (count + width >= SWRAST_MAX_WIDTH || row + 1 == height) {
/* flush the span */
span.end = count;
_swrast_write_rgba_span(ctx, &span);
span.end = 0;
count = 0;
}
}
swrast_render_finish(ctx);
_mesa_unmap_pbo_source(ctx, unpack);
}
/*
* XXX this is another way to implement Bitmap. Use horizontal runs of
* fragments, initializing the mask array to indicate which fragments to
* draw or skip.
*/
void
_swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLint row, col;
SWspan span;
ASSERT(ctx->RenderMode == GL_RENDER);
ASSERT(bitmap);
swrast_render_start(ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_MASK;
_swrast_span_default_attribs(ctx, &span);
/*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
span.x = px;
span.y = py;
/*span.end = width;*/
for (row=0; row<height; row++, span.y++) {
const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
_swrast_write_rgba_span(ctx, &span);
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
_swrast_write_rgba_span(ctx, &span);
/* get ready for next row */
if (mask != 128)
src++;
}
}
swrast_render_finish(ctx);
}
/**
* Try to do a fast and simple RGB(a) glDrawPixels.
* Return: GL_TRUE if success, GL_FALSE if slow path must be used instead
*/
static GLboolean
fast_draw_rgba_pixels(struct gl_context *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *userUnpack,
const GLvoid *pixels)
{
const GLint imgX = x, imgY = y;
struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
GLenum rbType;
SWcontext *swrast = SWRAST_CONTEXT(ctx);
SWspan span;
GLboolean simpleZoom;
GLint yStep; /* +1 or -1 */
struct gl_pixelstore_attrib unpack;
GLint destX, destY, drawWidth, drawHeight; /* post clipping */
if (!rb)
return GL_TRUE; /* no-op */
rbType = rb->DataType;
if ((swrast->_RasterMask & ~CLIP_BIT) ||
ctx->Texture._EnabledCoordUnits ||
userUnpack->SwapBytes ||
ctx->_ImageTransferState) {
/* can't handle any of those conditions */
return GL_FALSE;
}
INIT_SPAN(span, GL_BITMAP);
span.arrayMask = SPAN_RGBA;
span.arrayAttribs = FRAG_BIT_COL0;
_swrast_span_default_attribs(ctx, &span);
/* copy input params since clipping may change them */
unpack = *userUnpack;
destX = x;
destY = y;
drawWidth = width;
drawHeight = height;
/* check for simple zooming and clipping */
if (ctx->Pixel.ZoomX == 1.0F &&
(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F)) {
if (!_mesa_clip_drawpixels(ctx, &destX, &destY,
&drawWidth, &drawHeight, &unpack)) {
/* image was completely clipped: no-op, all done */
return GL_TRUE;
}
simpleZoom = GL_TRUE;
yStep = (GLint) ctx->Pixel.ZoomY;
ASSERT(yStep == 1 || yStep == -1);
}
else {
/* non-simple zooming */
simpleZoom = GL_FALSE;
yStep = 1;
if (unpack.RowLength == 0)
unpack.RowLength = width;
}
/*
* Ready to draw!
*/
if (format == GL_RGBA && type == rbType) {
const GLubyte *src
= (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
height, format, type, 0, 0);
const GLint srcStride = _mesa_image_row_stride(&unpack, width,
format, type);
if (simpleZoom) {
GLint row;
for (row = 0; row < drawHeight; row++) {
rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
src += srcStride;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
for (row = 0; row < drawHeight; row++) {
span.x = destX;
span.y = destY + row;
span.end = drawWidth;
span.array->ChanType = rbType;
_swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, src);
src += srcStride;
}
span.array->ChanType = CHAN_TYPE;
}
return GL_TRUE;
}
if (format == GL_RGB && type == rbType) {
const GLubyte *src
= (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
height, format, type, 0, 0);
const GLint srcStride = _mesa_image_row_stride(&unpack, width,
format, type);
if (simpleZoom) {
GLint row;
for (row = 0; row < drawHeight; row++) {
rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
src += srcStride;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
for (row = 0; row < drawHeight; row++) {
span.x = destX;
span.y = destY;
span.end = drawWidth;
span.array->ChanType = rbType;
_swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, src);
src += srcStride;
destY++;
}
span.array->ChanType = CHAN_TYPE;
}
return GL_TRUE;
}
/* Remaining cases haven't been tested with alignment != 1 */
if (userUnpack->Alignment != 1)
return GL_FALSE;
if (format == GL_LUMINANCE && type == CHAN_TYPE && rbType == CHAN_TYPE) {
const GLchan *src = (const GLchan *) pixels
+ (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels);
if (simpleZoom) {
/* no zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
GLchan rgb[MAX_WIDTH][3];
GLint i;
for (i = 0;i<drawWidth;i++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, rgb, NULL);
src += unpack.RowLength;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
GLchan rgb[MAX_WIDTH][3];
GLint i;
for (i = 0;i<drawWidth;i++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, rgb);
src += unpack.RowLength;
destY++;
}
}
return GL_TRUE;
}
if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE && rbType == CHAN_TYPE) {
const GLchan *src = (const GLchan *) pixels
+ (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels)*2;
if (simpleZoom) {
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
GLint i;
const GLchan *ptr = src;
for (i = 0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
rb->PutRow(ctx, rb, drawWidth, destX, destY,
span.array->rgba, NULL);
src += unpack.RowLength*2;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
const GLchan *ptr = src;
GLint i;
for (i = 0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
span.array->rgba);
src += unpack.RowLength*2;
destY++;
}
}
return GL_TRUE;
}
if (format == GL_COLOR_INDEX && type == GL_UNSIGNED_BYTE) {
const GLubyte *src = (const GLubyte *) pixels
+ unpack.SkipRows * unpack.RowLength + unpack.SkipPixels;
if (rbType == GL_UNSIGNED_BYTE) {
/* convert ubyte/CI data to ubyte/RGBA */
if (simpleZoom) {
GLint row;
for (row = 0; row < drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
span.array->rgba8);
rb->PutRow(ctx, rb, drawWidth, destX, destY,
span.array->rgba8, NULL);
src += unpack.RowLength;
destY += yStep;
}
}
else {
/* ubyte/CI to ubyte/RGBA with zooming */
GLint row;
for (row = 0; row < drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
span.array->rgba8);
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
span.array->rgba8);
src += unpack.RowLength;
destY++;
}
}
return GL_TRUE;
}
}
/* can't handle this pixel format and/or data type */
return GL_FALSE;
}
/**
* RGBA copypixels with convolution.
*/
static void
copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
GLint row;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLbitfield transferOps = ctx->_ImageTransferState;
const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
|| (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
GLfloat *dest, *tmpImage, *convImage;
SWspan span;
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_RGBA;
span.arrayAttribs = FRAG_BIT_COL0;
/* 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;
}
/* read source image as float/RGBA */
dest = tmpImage;
for (row = 0; row < height; row++) {
_swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, srcy + row, GL_FLOAT, dest);
dest += 4 * width;
}
/* 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);
}
if (!sink) {
/* write the new image */
for (row = 0; row < height; row++) {
const GLfloat *src = convImage + row * width * 4;
GLfloat *rgba = (GLfloat *) span.array->attribs[FRAG_ATTRIB_COL0];
/* copy convolved colors into span array */
memcpy(rgba, src, width * 4 * sizeof(GLfloat));
/* write span */
span.x = destx;
span.y = desty + row;
span.end = width;
span.array->ChanType = GL_FLOAT;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
/* restore this */
span.array->ChanType = CHAN_TYPE;
}
free(convImage);
}
/*
* TODO: Optimize!!!!
*/
static void
copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *readRb = fb->_DepthBuffer;
GLfloat *p, *tmpImage;
GLint sy, dy, stepy;
GLint j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
SWspan span;
if (!readRb) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_Z;
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (!overlapping && 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 (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 */
scale_and_bias_z(ctx, width, depth, span.array->z);
/* write depth values */
span.x = destx;
span.y = dy;
span.end = width;
if (zoom)
_swrast_write_zoomed_depth_span(ctx, destx, desty, &span);
else
_swrast_write_rgba_span(ctx, &span);
}
if (overlapping)
free(tmpImage);
}
/**
* RGBA copypixels
*/
static void
copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
GLfloat *tmpImage, *p;
GLint sy, dy, stepy, row;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
GLuint transferOps = ctx->_ImageTransferState;
SWspan span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
return;
}
else if (ctx->Pixel.Convolution1DEnabled) {
/* make sure we don't apply 1D convolution */
transferOps &= ~(IMAGE_CONVOLUTION_BIT |
IMAGE_POST_CONVOLUTION_SCALE_BIAS);
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be done bottom-to-top or top-to-bottom */
if (!overlapping && 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;
}
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_RGBA;
span.arrayAttribs = FRAG_BIT_COL0; /* we'll fill in COL0 attrib values */
if (overlapping) {
tmpImage = (GLfloat *) malloc(width * height * sizeof(GLfloat) * 4);
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* read the source image as RGBA/float */
p = tmpImage;
for (row = 0; row < height; row++) {
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy + row, GL_FLOAT, p );
p += width * 4;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warnings */
p = NULL;
}
ASSERT(width < MAX_WIDTH);
for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
GLvoid *rgba = span.array->attribs[FRAG_ATTRIB_COL0];
/* Get row/span of source pixels */
if (overlapping) {
/* get from buffered image */
memcpy(rgba, p, width * sizeof(GLfloat) * 4);
p += width * 4;
}
else {
/* get from framebuffer */
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, GL_FLOAT, rgba );
}
if (transferOps) {
_mesa_apply_rgba_transfer_ops(ctx, transferOps, width,
(GLfloat (*)[4]) rgba);
}
/* Write color span */
span.x = destx;
span.y = dy;
span.end = width;
span.array->ChanType = GL_FLOAT;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
span.array->ChanType = CHAN_TYPE; /* restore */
if (overlapping)
free(tmpImage);
}
static void
copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLuint *tmpImage,*p;
GLint sy, dy, stepy;
GLint j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
SWspan span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_INDEX;
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (!overlapping && 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 (overlapping) {
GLint ssy = sy;
tmpImage = (GLuint *) _mesa_malloc(width * height * sizeof(GLuint));
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* 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;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
/* Get color indexes */
if (overlapping) {
_mesa_memcpy(span.array->index, p, width * sizeof(GLuint));
p += width;
}
else {
_swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, span.array->index );
}
if (ctx->_ImageTransferState)
_mesa_apply_ci_transfer_ops(ctx, ctx->_ImageTransferState,
width, span.array->index);
/* write color indexes */
span.x = destx;
span.y = dy;
span.end = width;
if (zoom)
_swrast_write_zoomed_index_span(ctx, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
if (overlapping)
_mesa_free(tmpImage);
}