s_copypix.c File Reference

#include "main/glheader.h"
#include "main/context.h"
#include "main/colormac.h"
#include "main/convolve.h"
#include "main/histogram.h"
#include "main/image.h"
#include "main/macros.h"
#include "main/imports.h"
#include "main/pixel.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_span.h"
#include "s_stencil.h"
#include "s_zoom.h"

Functions
static GLboolean	regions_overlap (GLint srcx, GLint srcy, GLint dstx, GLint dsty, GLint width, GLint height, GLfloat zoomX, GLfloat zoomY)
	Determine if there's overlap in an image copy.
static void	copy_conv_rgba_pixels (GLcontext *ctx, GLint srcx, GLint srcy, GLint width, GLint height, GLint destx, GLint desty)
	RGBA copypixels with convolution.
static void	copy_rgba_pixels (GLcontext *ctx, GLint srcx, GLint srcy, GLint width, GLint height, GLint destx, GLint desty)
	RGBA copypixels.
static void	copy_ci_pixels (GLcontext *ctx, GLint srcx, GLint srcy, GLint width, GLint height, GLint destx, GLint desty)
static void	scale_and_bias_z (GLcontext *ctx, GLuint width, const GLfloat depth[], GLuint z[])
	Convert floating point Z values to integer Z values with pixel transfer's Z scale and bias.
static void	copy_depth_pixels (GLcontext *ctx, GLint srcx, GLint srcy, GLint width, GLint height, GLint destx, GLint desty)
static void	copy_stencil_pixels (GLcontext *ctx, GLint srcx, GLint srcy, GLint width, GLint height, GLint destx, GLint desty)
static void	copy_depth_stencil_pixels (GLcontext *ctx, const GLint srcX, const GLint srcY, const GLint width, const GLint height, const GLint destX, const GLint destY)
	This isn't terribly efficient.
static GLboolean	fast_copy_pixels (GLcontext *ctx, GLint srcX, GLint srcY, GLsizei width, GLsizei height, GLint dstX, GLint dstY, GLenum type)
	Try to do a fast copy pixels.
void	_swrast_CopyPixels (GLcontext *ctx, GLint srcx, GLint srcy, GLsizei width, GLsizei height, GLint destx, GLint desty, GLenum type)
	Do software-based glCopyPixels.

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Function Documentation

void _swrast_CopyPixels	(	GLcontext *	ctx,
		GLint	srcx,
		GLint	srcy,
		GLsizei	width,
		GLsizei	height,
		GLint	destx,
		GLint	desty,
		GLenum	type
	)

Do software-based glCopyPixels.

By time we get here, all parameters will have been error-checked.

static void copy_ci_pixels	(	GLcontext *	ctx,
		GLint	srcx,
		GLint	srcy,
		GLint	width,
		GLint	height,
		GLint	destx,
		GLint	desty
	)			[static]

static void copy_conv_rgba_pixels	(	GLcontext *	ctx,
		GLint	srcx,
		GLint	srcy,
		GLint	width,
		GLint	height,
		GLint	destx,
		GLint	desty
	)			[static]

RGBA copypixels with convolution.

static void copy_depth_pixels	(	GLcontext *	ctx,
		GLint	srcx,
		GLint	srcy,
		GLint	width,
		GLint	height,
		GLint	destx,
		GLint	desty
	)			[static]

static void copy_depth_stencil_pixels	(	GLcontext *	ctx,
		const GLint	srcX,
		const GLint	srcY,
		const GLint	width,
		const GLint	height,
		const GLint	destX,
		const GLint	destY
	)			[static]

This isn't terribly efficient.

If a driver really has combined depth/stencil buffers the driver should implement an optimized CopyPixels function.

static void copy_rgba_pixels	(	GLcontext *	ctx,
		GLint	srcx,
		GLint	srcy,
		GLint	width,
		GLint	height,
		GLint	destx,
		GLint	desty
	)			[static]

RGBA copypixels.

static void copy_stencil_pixels	(	GLcontext *	ctx,
		GLint	srcx,
		GLint	srcy,
		GLint	width,
		GLint	height,
		GLint	destx,
		GLint	desty
	)			[static]

static GLboolean fast_copy_pixels	(	GLcontext *	ctx,
		GLint	srcX,
		GLint	srcY,
		GLsizei	width,
		GLsizei	height,
		GLint	dstX,
		GLint	dstY,
		GLenum	type
	)			[static]

Try to do a fast copy pixels.

static GLboolean regions_overlap	(	GLint	srcx,
		GLint	srcy,
		GLint	dstx,
		GLint	dsty,
		GLint	width,
		GLint	height,
		GLfloat	zoomX,
		GLfloat	zoomY
	)			[static]

Determine if there's overlap in an image copy.

This test also compensates for the fact that copies are done from bottom to top and overlaps can sometimes be handled correctly without making a temporary image copy.

Returns:

GL_TRUE if the regions overlap, GL_FALSE otherwise.

static void scale_and_bias_z	(	GLcontext *	ctx,
		GLuint	width,
		const GLfloat	depth[],
		GLuint	z[]
	)			[static]

Convert floating point Z values to integer Z values with pixel transfer's Z scale and bias.

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