/* $Id: s_drawpix.c,v 1.3 2000/11/10 17:45:16 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 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 "colormac.h"
#include "context.h"
#include "convolve.h"
#include "image.h"
#include "macros.h"
#include "mem.h"
#include "mmath.h"
#include "pixel.h"
#include "s_context.h"
#include "s_drawpix.h"
#include "s_pixeltex.h"
#include "s_span.h"
#include "s_stencil.h"
#include "s_texture.h"
#include "s_zoom.h"
/*
* Given the dest position, size and skipPixels and skipRows values
* for a glDrawPixels command, perform clipping of the image bounds
* so the result lies withing the context's buffer bounds.
* Return: GL_TRUE if image is ready for drawing
* GL_FALSE if image was completely clipped away (draw nothing)
*/
GLboolean
_mesa_clip_pixelrect(const GLcontext *ctx,
GLint *destX, GLint *destY,
GLsizei *width, GLsizei *height,
GLint *skipPixels, GLint *skipRows)
{
const GLframebuffer *buffer = ctx->DrawBuffer;
/* left clipping */
if (*destX < buffer->Xmin) {
*skipPixels += (buffer->Xmin - *destX);
*width -= (buffer->Xmin - *destX);
*destX = buffer->Xmin;
}
/* right clipping */
if (*destX + *width > buffer->Xmax)
*width -= (*destX + *width - buffer->Xmax);
if (*width <= 0)
return GL_FALSE;
/* bottom clipping */
if (*destY < buffer->Ymin) {
*skipRows += (buffer->Ymin - *destY);
*height -= (buffer->Ymin - *destY);
*destY = buffer->Ymin;
}
/* top clipping */
if (*destY + *height > buffer->Ymax)
*height -= (*destY + *height - buffer->Ymax);
if (*height <= 0)
return GL_TRUE;
return GL_TRUE;
}
/*
* 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 GLvoid *pixels)
{
const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
GLchan rgb[MAX_WIDTH][3];
GLchan rgba[MAX_WIDTH][4];
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glDrawPixels",
GL_FALSE);
if (!ctx->Current.RasterPosValid) {
return GL_TRUE; /* no-op */
}
if ((SWRAST_CONTEXT(ctx)->_RasterMask&(~(SCISSOR_BIT|WINCLIP_BIT)))==0
&& ctx->Texture._ReallyEnabled == 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;
GLdepth zSpan[MAX_WIDTH]; /* only used when zooming */
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 gl_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 {
/* setup array of fragment Z value to pass to zoom function */
GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
GLint i;
ASSERT(drawWidth < MAX_WIDTH);
for (i=0; i<drawWidth; i++)
zSpan[i] = z;
/* save Y value of first row */
zoomY0 = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
}
/*
* 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.RGBAflag) {
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++) {
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(void *) 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--;
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(void *) src, NULL);
src += rowLength * 4;
}
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
zSpan, 0, (void *) src, zoomY0);
src += rowLength * 4;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_RGB && type == CHAN_TYPE
&& ctx->_ImageTransferState == 0) {
if (ctx->Visual.RGBAflag) {
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++) {
(*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(void *) 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--;
(*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(void *) src, NULL);
src += rowLength * 3;
}
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
gl_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
zSpan, 0, (void *) src, zoomY0);
src += rowLength * 3;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_LUMINANCE && type == CHAN_TYPE
&& ctx->_ImageTransferState==0) {
if (ctx->Visual.RGBAflag) {
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++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
(*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(void *) 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++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
destY--;
(*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(void *) 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++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
gl_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
zSpan, 0, (void *) rgb, zoomY0);
src += rowLength;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE
&& ctx->_ImageTransferState == 0) {
if (ctx->Visual.RGBAflag) {
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++) {
rgba[i][0] = *ptr;
rgba[i][1] = *ptr;
rgba[i][2] = *ptr++;
rgba[i][3] = *ptr++;
}
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(void *) 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++) {
rgba[i][0] = *ptr;
rgba[i][1] = *ptr;
rgba[i][2] = *ptr++;
rgba[i][3] = *ptr++;
}
destY--;
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(void *) 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++) {
rgba[i][0] = *ptr;
rgba[i][1] = *ptr;
rgba[i][2] = *ptr++;
rgba[i][3] = *ptr++;
}
gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
zSpan, 0, (void *) rgba, zoomY0);
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.RGBAflag) {
/* 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, rgba);
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(const GLchan (*)[4]) 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, rgba);
destY--;
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(const GLchan (*)[4]) 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, rgba);
gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
zSpan, 0, (void *) rgba, zoomY0);
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++) {
(*ctx->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;
}
/*
* Do glDrawPixels of index pixels.
*/
static void
draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, const GLvoid *pixels )
{
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
const GLint desty = y;
GLint row, drawWidth;
GLdepth zspan[MAX_WIDTH];
drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
/* Fragment depth values */
if (ctx->Depth.Test || ctx->Fog.Enabled) {
GLdepth zval = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
GLint i;
for (i = 0; i < drawWidth; i++) {
zspan[i] = zval;
}
}
/*
* General solution
*/
for (row = 0; row < height; row++, y++) {
GLuint indexes[MAX_WIDTH];
const GLvoid *source = _mesa_image_address(&ctx->Unpack,
pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
_mesa_unpack_index_span(ctx, drawWidth, GL_UNSIGNED_INT, indexes,
type, source, &ctx->Unpack,
ctx->_ImageTransferState);
if (zoom) {
gl_write_zoomed_index_span(ctx, drawWidth, x, y, zspan, 0, indexes, desty);
}
else {
gl_write_index_span(ctx, drawWidth, x, y, zspan, 0, indexes, GL_BITMAP);
}
}
}
/*
* Do glDrawPixels of stencil image. The image datatype may either
* be GLubyte or GLbitmap.
*/
static void
draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, const GLvoid *pixels )
{
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
const GLint desty = y;
GLint row, drawWidth;
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 &&
type != GL_BITMAP) {
gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels(stencil type)");
return;
}
drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
for (row = 0; row < height; row++, y++) {
GLstencil values[MAX_WIDTH];
GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
const GLvoid *source = _mesa_image_address(&ctx->Unpack,
pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
_mesa_unpack_index_span(ctx, drawWidth, destType, values,
type, source, &ctx->Unpack,
ctx->_ImageTransferState);
if (ctx->_ImageTransferState & IMAGE_SHIFT_OFFSET_BIT) {
_mesa_shift_and_offset_stencil( ctx, drawWidth, values );
}
if (ctx->Pixel.MapStencilFlag) {
_mesa_map_stencil( ctx, drawWidth, values );
}
if (zoom) {
gl_write_zoomed_stencil_span( ctx, (GLuint) drawWidth, x, y,
values, desty );
}
else {
_mesa_write_stencil_span( ctx, (GLuint) drawWidth, x, y, values );
}
}
}
/*
* Do a glDrawPixels of depth values.
*/
static void
draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, 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;
GLchan rgba[MAX_WIDTH][4];
GLuint ispan[MAX_WIDTH];
GLint drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
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) {
gl_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
return;
}
/* Colors or indexes */
if (ctx->Visual.RGBAflag) {
GLint r = FLOAT_TO_CHAN(ctx->Current.RasterColor[0]);
GLint g = FLOAT_TO_CHAN(ctx->Current.RasterColor[1]);
GLint b = FLOAT_TO_CHAN(ctx->Current.RasterColor[2]);
GLint a = FLOAT_TO_CHAN(ctx->Current.RasterColor[3]);
GLint i;
for (i = 0; i < drawWidth; i++) {
rgba[i][RCOMP] = r;
rgba[i][GCOMP] = g;
rgba[i][BCOMP] = b;
rgba[i][ACOMP] = a;
}
}
else {
GLint i;
for (i = 0; i < drawWidth; i++) {
ispan[i] = ctx->Current.RasterIndex;
}
}
if (type==GL_UNSIGNED_SHORT && sizeof(GLdepth)==sizeof(GLushort)
&& !bias_or_scale && !zoom && ctx->Visual.RGBAflag) {
/* Special case: directly write 16-bit depth values */
GLint row;
for (row = 0; row < height; row++, y++) {
GLdepth zspan[MAX_WIDTH];
const GLushort *zptr = _mesa_image_address(&ctx->Unpack,
pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
GLint i;
for (i = 0; i < width; i++)
zspan[i] = zptr[i];
gl_write_rgba_span( ctx, width, x, y, zspan, 0, rgba, GL_BITMAP );
}
}
else if (type==GL_UNSIGNED_INT && ctx->Visual.DepthBits == 32
&& !bias_or_scale && !zoom && ctx->Visual.RGBAflag) {
/* Special case: directly write 32-bit depth values */
GLint row;
for (row = 0; row < height; row++, y++) {
const GLuint *zptr = _mesa_image_address(&ctx->Unpack,
pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
gl_write_rgba_span( ctx, width, x, y, zptr, 0, rgba, GL_BITMAP );
}
}
else {
/* General case */
GLint row;
for (row = 0; row < height; row++, y++) {
GLdepth zspan[MAX_WIDTH];
const GLvoid *src = _mesa_image_address(&ctx->Unpack,
pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
_mesa_unpack_depth_span( ctx, drawWidth, zspan, type, src,
&ctx->Unpack, ctx->_ImageTransferState );
if (ctx->Visual.RGBAflag) {
if (zoom) {
gl_write_zoomed_rgba_span(ctx, width, x, y, zspan, 0,
(const GLchan (*)[4]) rgba, desty);
}
else {
gl_write_rgba_span(ctx, width, x, y, zspan, 0, rgba, GL_BITMAP);
}
}
else {
if (zoom) {
gl_write_zoomed_index_span(ctx, width, x, y, zspan, 0,
ispan, GL_BITMAP);
}
else {
gl_write_index_span(ctx, width, x, y, zspan, 0,
ispan, GL_BITMAP);
}
}
}
}
}
/*
* Do glDrawPixels of RGBA pixels.
*/
static void
draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type, const GLvoid *pixels )
{
const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
const GLint desty = y;
GLdepth zspan[MAX_WIDTH];
GLboolean quickDraw;
GLfloat *convImage = NULL;
GLuint transferOps = ctx->_ImageTransferState;
if (!_mesa_is_legal_format_and_type(format, type)) {
gl_error(ctx, GL_INVALID_ENUM, "glDrawPixels(format or type)");
return;
}
/* Try an optimized glDrawPixels first */
if (fast_draw_pixels(ctx, x, y, width, height, format, type, pixels))
return;
/* Fragment depth values */
if (ctx->Depth.Test || ctx->Fog.Enabled) {
/* fill in array of z values */
GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMaxF);
GLint i;
for (i=0;i<width;i++) {
zspan[i] = z;
}
}
if (SWRAST_CONTEXT(ctx)->_RasterMask == 0 && !zoom && x >= 0 && y >= 0
&& x + width <= ctx->DrawBuffer->Width
&& y + height <= ctx->DrawBuffer->Height) {
quickDraw = GL_TRUE;
}
else {
quickDraw = GL_FALSE;
}
if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
/* Convolution has to be handled specially. We'll create an
* intermediate image, applying all pixel transfer operations
* up to convolution. Then we'll convolve the image. Then
* we'll proceed with the rest of the transfer operations and
* rasterize the image.
*/
GLint row;
GLfloat *dest, *tmpImage;
tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
gl_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
return;
}
convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
FREE(tmpImage);
gl_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
return;
}
/* Unpack the image and apply transfer ops up to convolution */
dest = tmpImage;
for (row = 0; row < height; row++) {
const GLvoid *source = _mesa_image_address(unpack,
pixels, width, height, format, type, 0, row, 0);
_mesa_unpack_float_color_span(ctx, width, GL_RGBA, (void *) dest,
format, type, source, unpack,
transferOps & IMAGE_PRE_CONVOLUTION_BITS,
GL_FALSE);
dest += width * 4;
}
/* 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);
/* continue transfer ops and draw the convolved image */
unpack = &_mesa_native_packing;
pixels = convImage;
format = GL_RGBA;
type = GL_FLOAT;
transferOps &= IMAGE_POST_CONVOLUTION_BITS;
}
/*
* General solution
*/
{
GLchan rgba[MAX_WIDTH][4];
GLint row;
if (width > MAX_WIDTH)
width = MAX_WIDTH;
for (row = 0; row < height; row++, y++) {
const GLvoid *source = _mesa_image_address(unpack,
pixels, width, height, format, type, 0, row, 0);
_mesa_unpack_chan_color_span(ctx, width, GL_RGBA, (void*) rgba,
format, type, source, unpack,
transferOps);
if ((ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink) ||
(ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink))
continue;
if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
GLchan primary_rgba[MAX_WIDTH][4];
GLuint unit;
/* XXX not sure how multitexture is supposed to work here */
MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
if (ctx->Texture.Unit[unit]._ReallyEnabled) {
_mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
s, t, r, q);
gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
primary_rgba, rgba);
}
}
}
if (quickDraw) {
(*ctx->Driver.WriteRGBASpan)( ctx, width, x, y,
(CONST GLchan (*)[]) rgba, NULL);
}
else if (zoom) {
gl_write_zoomed_rgba_span( ctx, width, x, y, zspan, 0,
(CONST GLchan (*)[]) rgba, desty );
}
else {
gl_write_rgba_span( ctx, (GLuint) width, x, y, zspan, 0,
rgba, GL_BITMAP);
}
}
}
if (convImage) {
FREE(convImage);
}
}
/*
* Execute glDrawPixels
*/
void
_swrast_DrawPixels( GLcontext *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
(void) unpack;
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
switch (format) {
case GL_STENCIL_INDEX:
draw_stencil_pixels( ctx, x, y, width, height, type, pixels );
break;
case GL_DEPTH_COMPONENT:
draw_depth_pixels( ctx, x, y, width, height, type, pixels );
break;
case GL_COLOR_INDEX:
if (ctx->Visual.RGBAflag)
draw_rgba_pixels(ctx, x,y, width, height, format, type, pixels);
else
draw_index_pixels(ctx, x, y, width, height, type, pixels);
break;
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
case GL_RGB:
case GL_BGR:
case GL_RGBA:
case GL_BGRA:
case GL_ABGR_EXT:
draw_rgba_pixels(ctx, x, y, width, height, format, type, pixels);
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels(format)" );
}
}