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/**
* \file radeon_subset_readpix.c
* \brief Pixel reading.
*
* \author Keith Whitwell <keith@tungstengraphics.com>
* \author Brian Paul <brian@tungstengraphics.com>
*/
/*
* Copyright 2003 ATI Technologies Inc., Ontario, Canada, and
* Tungsten Graphics Inc., Cedar Park, Texas.
*
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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 (including the next
* paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* ATI, TUNGSTEN GRAPHICS AND/OR THEIR SUPPLIERS 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.
*/
/* $XFree86$ */
#include "glheader.h"
#include "mtypes.h"
#include "colormac.h"
#include "context.h"
#include "enums.h"
#include "imports.h"
/*#include "mmath.h" */
#include "macros.h"
#include "state.h"
#include "radeon_context.h"
#include "radeon_ioctl.h"
#include "radeon_state.h"
#include "radeon_subset.h"
/**
* \brief Read pixel in RGBA format on a Radeon 16bpp frame buffer.
*
* \param rgba destination pointer.
* \param ptr pointer to the pixel in the frame buffer.
*/
#define READ_RGBA_16( rgba, ptr ) \
do { \
GLushort p = *(GLushort *)ptr; \
rgba[0] = ((p >> 8) & 0xf8) * 255 / 0xf8; \
rgba[1] = ((p >> 3) & 0xfc) * 255 / 0xfc; \
rgba[2] = ((p << 3) & 0xf8) * 255 / 0xf8; \
rgba[3] = 0xff; \
} while (0)
/**
* \brief Read pixel in RGBA format on a Radeon 32bpp frame buffer.
*
* \param rgba destination pointer.
* \param ptr pointer to the pixel in the frame buffer.
*/
#define READ_RGBA_32( rgba, ptr ) \
do { \
GLuint p = *(GLuint *)ptr; \
rgba[0] = (p >> 16) & 0xff; \
rgba[1] = (p >> 8) & 0xff; \
rgba[2] = (p >> 0) & 0xff; \
rgba[3] = (p >> 24) & 0xff; \
} while (0)
/**
* \brief Read a span in RGBA format.
*
* \param ctx GL context.
* \param n number of pixels in the span.
* \param x x position of the span start.
* \param y y position of the span.
* \param rgba destination buffer.
*
* Calculates the pointer to the span start in the frame buffer and uses either
* #READ_RGBA_16 or #READ_RGBA_32 macros to copy the values.
*/
static void ReadRGBASpan( const GLcontext *ctx,
GLuint n, GLint x, GLint y,
GLubyte rgba[][4])
{
radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
radeonScreenPtr radeonScreen = rmesa->radeonScreen;
__DRIdrawablePrivate *dPriv = rmesa->dri.drawable;
GLuint cpp = radeonScreen->cpp;
GLuint pitch = radeonScreen->frontPitch * cpp;
GLint i;
if (ctx->_RotateMode) {
char *ptr = (char *)(rmesa->dri.screen->pFB +
rmesa->state.pixel.readOffset +
((dPriv->x + (dPriv->w - y - 1)) * cpp) +
((dPriv->y + (dPriv->h - x - 1)) * pitch));
if (cpp == 4)
for (i = 0; i < n; i++, ptr -= pitch)
READ_RGBA_32( rgba[i], ptr );
else
for (i = 0; i < n; i++, ptr -= pitch)
READ_RGBA_16( rgba[i], ptr );
}
else {
char *ptr = (char *)(rmesa->dri.screen->pFB +
rmesa->state.pixel.readOffset +
((dPriv->x + x) * cpp) +
((dPriv->y + (dPriv->h - y - 1)) * pitch));
if (cpp == 4)
for (i = 0; i < n; i++, ptr += cpp)
READ_RGBA_32( rgba[i], ptr );
else
for (i = 0; i < n; i++, ptr += cpp)
READ_RGBA_16( rgba[i], ptr );
}
}
/**
* \brief Optimized glReadPixels().
*
* To be used with particular pixel formats GL_UNSIGNED_BYTE and GL_RGBA, when pixel
* scaling, biasing and mapping are disabled.
*
* \param x x start position of the reading rectangle.
* \param y y start position of the reading rectangle.
* \param width width of the reading rectangle.
* \param height height of the reading rectangle.
* \param format pixel format. Must be GL_RGBA.
* \param type pixel type. Must be GL_UNSIGNED_BYTE.
* \param pixels pixel data.
*
* After asserting the above conditions, compensates for clipping and calls
* ReadRGBASpan() to read each row.
*/
void radeonReadPixels( GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLvoid *pixels )
{
GET_CURRENT_CONTEXT(ctx);
GLint srcX = x;
GLint srcY = y;
GLint readWidth = width; /* actual width read */
GLint readHeight = height; /* actual height read */
const struct gl_pixelstore_attrib *packing = &ctx->Pack;
GLint skipRows = packing->SkipRows;
GLint skipPixels = packing->SkipPixels;
GLint rowLength;
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
{
GLint tmp, tmps;
tmp = x; x = y; y = tmp;
tmps = width; width = height; height = tmps;
}
if (width < 0 || height < 0) {
_mesa_error( ctx, GL_INVALID_VALUE,
"glReadPixels(width=%d height=%d)", width, height );
return;
}
if (!pixels) {
_mesa_error( ctx, GL_INVALID_VALUE, "glReadPixels(pixels)" );
return;
}
if (ctx->NewState)
_mesa_update_state(ctx);
/* can't do scale, bias, mapping, etc */
assert(!ctx->_ImageTransferState);
/* can't do fancy pixel packing */
assert (packing->Alignment == 1 &&
!packing->SwapBytes &&
!packing->LsbFirst);
if (packing->RowLength > 0)
rowLength = packing->RowLength;
else
rowLength = width;
/* horizontal clipping */
if (srcX < 0) {
skipPixels -= srcX;
readWidth += srcX;
srcX = 0;
}
if (srcX + readWidth > (GLint) ctx->ReadBuffer->Width)
readWidth -= (srcX + readWidth - (GLint) ctx->ReadBuffer->Width);
if (readWidth <= 0)
return;
/* vertical clipping */
if (srcY < 0) {
skipRows -= srcY;
readHeight += srcY;
srcY = 0;
}
if (srcY + readHeight > (GLint) ctx->ReadBuffer->Height)
readHeight -= (srcY + readHeight - (GLint) ctx->ReadBuffer->Height);
if (readHeight <= 0)
return;
/*
* Ready to read!
* The window region at (destX, destY) of size (readWidth, readHeight)
* will be read back.
* We'll write pixel data to buffer pointed to by "pixels" but we'll
* skip "skipRows" rows and skip "skipPixels" pixels/row.
*/
if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
GLchan *dest = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels) * 4;
GLint row;
for (row=0; row<readHeight; row++) {
ReadRGBASpan(ctx, readWidth, srcX, srcY, (GLchan (*)[4]) dest);
dest += rowLength * 4;
srcY++;
}
}
else {
/* can't do this format/type combination */
assert(0);
}
}
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