s_zoom.c File Reference

#include "main/glheader.h"
#include "main/macros.h"
#include "main/imports.h"
#include "main/colormac.h"
#include "s_context.h"
#include "s_span.h"
#include "s_stencil.h"
#include "s_zoom.h"

Functions
static GLboolean	compute_zoomed_bounds (GLcontext *ctx, GLint imageX, GLint imageY, GLint spanX, GLint spanY, GLint width, GLint *x0, GLint *x1, GLint *y0, GLint *y1)
	Compute the bounds of the region resulting from zooming a pixel span.
static INLINE GLint	unzoom_x (GLfloat zoomX, GLint imageX, GLint zx)
	Convert a zoomed x image coordinate back to an unzoomed x coord.
static void	zoom_span (GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span, const GLvoid *src, GLenum format)
	Helper function called from _swrast_write_zoomed_rgba/rgb/ index/depth_span().
void	_swrast_write_zoomed_rgba_span (GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span, const GLvoid *rgba)
void	_swrast_write_zoomed_rgb_span (GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span, const GLvoid *rgb)
void	_swrast_write_zoomed_index_span (GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span)
void	_swrast_write_zoomed_depth_span (GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span)
void	_swrast_write_zoomed_stencil_span (GLcontext *ctx, GLint imgX, GLint imgY, GLint width, GLint spanX, GLint spanY, const GLstencil stencil[])
	Zoom/write stencil values.
void	_swrast_write_zoomed_z_span (GLcontext *ctx, GLint imgX, GLint imgY, GLint width, GLint spanX, GLint spanY, const GLvoid *z)
	Zoom/write z values (16 or 32-bit).

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Function Documentation

void _swrast_write_zoomed_depth_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		const SWspan *	span
	)

void _swrast_write_zoomed_index_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		const SWspan *	span
	)

void _swrast_write_zoomed_rgb_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		const SWspan *	span,
		const GLvoid *	rgb
	)

void _swrast_write_zoomed_rgba_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		const SWspan *	span,
		const GLvoid *	rgba
	)

void _swrast_write_zoomed_stencil_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		GLint	width,
		GLint	spanX,
		GLint	spanY,
		const GLstencil	stencil[]
	)

Zoom/write stencil values.

No per-fragment operations are applied.

void _swrast_write_zoomed_z_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		GLint	width,
		GLint	spanX,
		GLint	spanY,
		const GLvoid *	z
	)

Zoom/write z values (16 or 32-bit).

No per-fragment operations are applied.

static GLboolean compute_zoomed_bounds	(	GLcontext *	ctx,
		GLint	imageX,
		GLint	imageY,
		GLint	spanX,
		GLint	spanY,
		GLint	width,
		GLint *	x0,
		GLint *	x1,
		GLint *	y0,
		GLint *	y1
	)			[static]

Compute the bounds of the region resulting from zooming a pixel span.

The resulting region will be entirely inside the window/scissor bounds so no additional clipping is needed.

Parameters:

	imageX,imageY	position of the mage being drawn (gl WindowPos)
	spanX,spanY	position of span being drawing
	width	number of pixels in span
	x0,x1	returned X bounds of zoomed region [x0, x1)
	y0,y1	returned Y bounds of zoomed region [y0, y1)

Returns:

GL_TRUE if any zoomed pixels visible, GL_FALSE if totally clipped

static INLINE GLint unzoom_x	(	GLfloat	zoomX,
		GLint	imageX,
		GLint	zx
	)			[static]

Convert a zoomed x image coordinate back to an unzoomed x coord.

'zx' is screen position of a pixel in the zoomed image, who's left edge is at 'imageX'. return corresponding x coord in the original, unzoomed image. This can use this for unzooming X or Y values.

static void zoom_span	(	GLcontext *	ctx,
		GLint	imgX,
		GLint	imgY,
		const SWspan *	span,
		const GLvoid *	src,
		GLenum	format
	)			[static]

Helper function called from _swrast_write_zoomed_rgba/rgb/ index/depth_span().

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