/*
* 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 GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
GLint row, skipPixels;
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
/*
* General solution
*/
skipPixels = 0;
while (skipPixels < width) {
const GLint spanX = x + (zoom ? 0 : skipPixels);
GLint spanY = y;
const GLint spanEnd = (width - skipPixels > MAX_WIDTH)
? MAX_WIDTH : (width - skipPixels);
ASSERT(spanEnd <= MAX_WIDTH);
for (row = 0; row < height; row++, spanY++) {
const GLvoid *source = _mesa_image_address2d(unpack, pixels,
width, height,
GL_COLOR_INDEX, type,
row, skipPixels);
_mesa_unpack_index_span(ctx, spanEnd, GL_UNSIGNED_INT,
span.array->index, type, source, unpack,
ctx->_ImageTransferState);
/* These may get changed during writing/clipping */
span.x = spanX;
span.y = spanY;
span.end = spanEnd;
if (zoom)
_swrast_write_zoomed_index_span(ctx, &span, y, skipPixels);
else
_swrast_write_index_span(ctx, &span);
}
skipPixels += spanEnd;
}
}
/*
* 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);
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *readRb = fb->_DepthBuffer;
const GLfloat depthMax = fb->_DepthMaxF;
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);
/* 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 *) _mesa_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) {
_mesa_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] = (GLuint) (CLAMP(d, 0.0F, 1.0F) * depthMax);
}
/* write depth values */
span.x = destx;
span.y = dy;
span.end = width;
if (fb->Visual.rgbMode) {
if (zoom)
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(const GLchan (*)[4]) span.array->rgba);
else
_swrast_write_rgba_span(ctx, &span);
}
else {
if (zoom)
_swrast_write_zoomed_index_span(ctx, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
}
if (overlapping)
_mesa_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;
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 (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 );
}
/* 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, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
if (overlapping)
_mesa_free(tmpImage);
}
/*
* 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;
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 (overlapping) {
GLint ssy = sy;
tmpImage = (GLchan *) _mesa_malloc(width * height * sizeof(GLchan) * 4);
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* 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;
}
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);
_mesa_memcpy(span.array->rgba, p, width * sizeof(GLchan) * 4);
p += width * 4;
}
else {
/* get from framebuffer */
ASSERT(width < MAX_WIDTH);
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, span.array->rgba );
}
if (transferOps) {
GLfloat rgbaFloat[MAX_WIDTH][4];
/* 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);
}
/* 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 {
span.x = destx;
span.y = dy;
span.end = width;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(CONST GLchan (*)[4]) span.array->rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
}
if (overlapping)
_mesa_free(tmpImage);
}
/*
* 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;
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;
}
/* allocate space for GLfloat image */
tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
_mesa_free(tmpImage);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
/* 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;
}
/* 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);
}
_mesa_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);
/* 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 {
span.x = destx;
span.y = dy;
span.end = width;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(CONST GLchan (*)[4])span.array->rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
}
_mesa_free(convImage);
}
/*
* Draw depth image.
*/
static void
draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
const GLint desty = y;
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
if (type != GL_BYTE
&& type != GL_UNSIGNED_BYTE
&& type != GL_SHORT
&& type != GL_UNSIGNED_SHORT
&& type != GL_INT
&& type != GL_UNSIGNED_INT
&& type != GL_FLOAT) {
_mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
return;
}
_swrast_span_default_color(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
if (ctx->Texture._EnabledCoordUnits)
_swrast_span_default_texcoords(ctx, &span);
if (type == GL_UNSIGNED_SHORT
&& ctx->Visual.depthBits == 16
&& !bias_or_scale
&& !zoom
&& ctx->Visual.rgbMode
&& width <= MAX_WIDTH) {
/* Special case: directly write 16-bit depth values */
GLint row, spanY = y;
for (row = 0; row < height; row++, spanY++) {
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 = spanY;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else if (type == GL_UNSIGNED_INT
&& sizeof(GLdepth) == 4
&& !bias_or_scale
&& !zoom
&& ctx->Visual.rgbMode
&& width <= MAX_WIDTH) {
/* Special case: shift 32-bit values down to ctx->Visual.depthBits */
const GLint shift = 32 - ctx->Visual.depthBits;
GLint row, spanY = y;
for (row = 0; row < height; row++, spanY++) {
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(GLdepth));
}
else {
GLint col;
for (col = 0; col < width; col++)
span.array->z[col] = zSrc[col] >> shift;
}
span.x = x;
span.y = spanY;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else {
/*
* 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_pixels(GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
if (!ctx->Current.RasterPosValid) {
return GL_TRUE; /* no-op */
}
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
if (ctx->Texture._EnabledCoordUnits)
_swrast_span_default_texcoords(ctx, &span);
if ((SWRAST_CONTEXT(ctx)->_RasterMask & ~CLIP_BIT) == 0
&& ctx->Texture._EnabledCoordUnits == 0
&& unpack->Alignment == 1
&& !unpack->SwapBytes
&& !unpack->LsbFirst) {
GLint destX = x;
GLint destY = y;
GLint drawWidth = width; /* actual width drawn */
GLint drawHeight = height; /* actual height drawn */
GLint skipPixels = unpack->SkipPixels;
GLint skipRows = unpack->SkipRows;
GLint rowLength;
GLint zoomY0 = 0;
if (unpack->RowLength > 0)
rowLength = unpack->RowLength;
else
rowLength = width;
/* If we're not using pixel zoom then do all clipping calculations
* now. Otherwise, we'll let the _swrast_write_zoomed_*_span() functions
* handle the clipping.
*/
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* horizontal clipping */
if (destX < ctx->DrawBuffer->_Xmin) {
skipPixels += (ctx->DrawBuffer->_Xmin - destX);
drawWidth -= (ctx->DrawBuffer->_Xmin - destX);
destX = ctx->DrawBuffer->_Xmin;
}
if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
if (drawWidth <= 0)
return GL_TRUE;
/* vertical clipping */
if (destY < ctx->DrawBuffer->_Ymin) {
skipRows += (ctx->DrawBuffer->_Ymin - destY);
drawHeight -= (ctx->DrawBuffer->_Ymin - destY);
destY = ctx->DrawBuffer->_Ymin;
}
if (destY + drawHeight > ctx->DrawBuffer->_Ymax)
drawHeight -= (destY + drawHeight - ctx->DrawBuffer->_Ymax);
if (drawHeight <= 0)
return GL_TRUE;
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down image */
/* horizontal clipping */
if (destX < ctx->DrawBuffer->_Xmin) {
skipPixels += (ctx->DrawBuffer->_Xmin - destX);
drawWidth -= (ctx->DrawBuffer->_Xmin - destX);
destX = ctx->DrawBuffer->_Xmin;
}
if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
if (drawWidth <= 0)
return GL_TRUE;
/* vertical clipping */
if (destY > ctx->DrawBuffer->_Ymax) {
skipRows += (destY - ctx->DrawBuffer->_Ymax);
drawHeight -= (destY - ctx->DrawBuffer->_Ymax);
destY = ctx->DrawBuffer->_Ymax;
}
if (destY - drawHeight < ctx->DrawBuffer->_Ymin)
drawHeight -= (ctx->DrawBuffer->_Ymin - (destY - drawHeight));
if (drawHeight <= 0)
return GL_TRUE;
}
else {
if (drawWidth > MAX_WIDTH)
return GL_FALSE; /* fall back to general case path */
/* save Y value of first row */
zoomY0 = IROUND(ctx->Current.RasterPos[1]);
}
/*
* Ready to draw!
* The window region at (destX, destY) of size (drawWidth, drawHeight)
* will be written to.
* We'll take pixel data from buffer pointed to by "pixels" but we'll
* skip "skipRows" rows and skip "skipPixels" pixels/row.
*/
if (format == GL_RGBA && type == CHAN_TYPE
&& ctx->_ImageTransferState==0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels) * 4;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) src, NULL);
src += rowLength * 4;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
destY--;
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) src, NULL);
src += rowLength * 4;
}
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, &span,
(CONST GLchan (*)[4]) src, zoomY0, 0);
src += rowLength * 4;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_RGB && type == CHAN_TYPE
&& ctx->_ImageTransferState == 0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels) * 3;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
GLint row;
for (row=0; row<drawHeight; row++) {
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) src, NULL);
src += rowLength * 3;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
destY--;
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) src, NULL);
src += rowLength * 3;
}
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgb_span(ctx, &span,
(CONST GLchan (*)[3]) src, zoomY0, 0);
src += rowLength * 3;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_LUMINANCE && type == CHAN_TYPE
&& ctx->_ImageTransferState==0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels);
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgb[i][0] = src[i];
span.array->rgb[i][1] = src[i];
span.array->rgb[i][2] = src[i];
}
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) span.array->rgb, NULL);
src += rowLength;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgb[i][0] = src[i];
span.array->rgb[i][1] = src[i];
span.array->rgb[i][2] = src[i];
}
destY--;
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) span.array->rgb, NULL);
src += rowLength;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgb[i][0] = src[i];
span.array->rgb[i][1] = src[i];
span.array->rgb[i][2] = src[i];
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgb_span(ctx, &span,
(CONST GLchan (*)[3]) span.array->rgb, zoomY0, 0);
src += rowLength;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE
&& ctx->_ImageTransferState == 0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels)*2;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
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++;
}
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength*2;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
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++;
}
destY--;
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength*2;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
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, &span,
(CONST GLchan (*)[4]) span.array->rgba, zoomY0, 0);
src += rowLength*2;
destY++;
}
}
}
return GL_TRUE;
}
else if (format==GL_COLOR_INDEX && type==GL_UNSIGNED_BYTE) {
GLubyte *src = (GLubyte *) pixels + skipRows * rowLength + skipPixels;
if (ctx->Visual.rgbMode) {
/* convert CI data to RGBA */
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(const GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength;
destY++;
}
return GL_TRUE;
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
destY--;
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength;
}
return GL_TRUE;
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, &span,
(CONST GLchan (*)[4]) span.array->rgba, zoomY0, 0);
src += rowLength;
destY++;
}
return GL_TRUE;
}
}
else if (ctx->_ImageTransferState==0) {
/* write CI data to CI frame buffer */
GLint row;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
for (row=0; row<drawHeight; row++) {
(*swrast->Driver.WriteCI8Span)(ctx, drawWidth, destX, destY,
src, NULL);
src += rowLength;
destY++;
}
return GL_TRUE;
}
else {
/* with zooming */
return GL_FALSE;
}
}
}
else {
/* can't handle this pixel format and/or data type here */
return GL_FALSE;
}
}
/* can't do a simple draw, have to use slow path */
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)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
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, 0, 0, SPAN_RGBA);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
_swrast_span_default_secondary_color(ctx, &span);
/* allocate space for GLfloat image */
tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
_mesa_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);
}
_mesa_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;
GLvoid *rgba = (GLvoid *) span.array->attribs[FRAG_ATTRIB_COL0];
/* copy convolved colors into span array */
_mesa_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;
}
_mesa_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);
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, 0, 0, SPAN_RGBA);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
_swrast_span_default_secondary_color(ctx, &span);
if (overlapping) {
tmpImage = (GLfloat *) _mesa_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 */
_mesa_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)
_mesa_free(tmpImage);
}