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authormarha <marha@users.sourceforge.net>2009-10-08 13:15:52 +0000
committermarha <marha@users.sourceforge.net>2009-10-08 13:15:52 +0000
commita0c4815433ccd57322f4f7703ca35e9ccfa59250 (patch)
treef5213802ec12adb86ec3136001c1c29fe5343700 /mesalib/src/mesa/swrast/s_bitmap.c
parentc73dc01b6de45612b24dc2dd34fba24d81ebf46c (diff)
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Added MesaLib-7.6
Diffstat (limited to 'mesalib/src/mesa/swrast/s_bitmap.c')
-rw-r--r--mesalib/src/mesa/swrast/s_bitmap.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/s_bitmap.c b/mesalib/src/mesa/swrast/s_bitmap.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 7.1
+ *
+ * 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
+ * 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.
+ */
+
+/**
+ * \file swrast/s_bitmap.c
+ * \brief glBitmap rendering.
+ * \author Brian Paul
+ */
+
+#include "main/glheader.h"
+#include "main/bufferobj.h"
+#include "main/image.h"
+#include "main/macros.h"
+#include "main/pixel.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( GLcontext *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);
+
+ 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 >= MAX_WIDTH || row + 1 == height) {
+ /* flush the span */
+ span.end = count;
+ if (ctx->Visual.rgbMode)
+ _swrast_write_rgba_span(ctx, &span);
+ else
+ _swrast_write_index_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( GLcontext *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;
+ }
+ }
+
+ if (ctx->Visual.rgbMode)
+ _swrast_write_rgba_span(ctx, &span);
+ else
+ _swrast_write_index_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;
+ }
+ }
+
+ if (ctx->Visual.rgbMode)
+ _swrast_write_rgba_span(ctx, &span);
+ else
+ _swrast_write_index_span(ctx, &span);
+
+ /* get ready for next row */
+ if (mask != 128)
+ src++;
+ }
+ }
+
+ swrast_render_finish(ctx);
+}
+#endif