/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2008 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
/**
* \file swrast/s_bitmap.c
* \brief glBitmap rendering.
* \author Brian Paul
*/
#include "main/glheader.h"
#include "main/bufferobj.h"
#include "main/condrender.h"
#include "main/image.h"
#include "main/macros.h"
#include "main/pbo.h"
#include "s_context.h"
#include "s_span.h"
/**
* 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);
}
#if 0
/*
* 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);
}
#endif