mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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496c8f4a11
The current implementation of the glyph cache deals with atlases by padding them with 1 pixel at the beginning, at the end, and between each glyph. That's cool and all, however, there's a very subtle problem with this approach: the contents of the atlas are garbage, so this padding is filled with garbage memory! Rework the Vulkan glyph cache to draw each and every glyph in a surface that has 1 pixel border of padding around it. Ensure the surface is completely black by drawing a rectangle before handing it to Pango to draw the glyph. Update tx and ty to pick the texture position adjusted to the 1 pixel padding. The atlas now starts at position (0, 0), since each glyph individually contains its own padding. To improve legibility, add a PADDING define and use it everywhere.
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
#pragma once
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#include "gskvulkanrenderer.h"
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#include "gskvulkanimageprivate.h"
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G_BEGIN_DECLS
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GskVulkanImage * gsk_vulkan_renderer_ref_texture_image (GskVulkanRenderer *self,
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GdkTexture *texture,
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GskVulkanUploader *uploader);
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typedef struct
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{
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guint texture_index;
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float tx;
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float ty;
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float tw;
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float th;
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int draw_x;
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int draw_y;
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int draw_width;
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int draw_height;
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int atlas_x;
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int atlas_y;
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guint64 timestamp;
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} GskVulkanCachedGlyph;
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guint gsk_vulkan_renderer_cache_glyph (GskVulkanRenderer *renderer,
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PangoFont *font,
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PangoGlyph glyph,
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int x,
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int y,
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float scale);
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GskVulkanImage * gsk_vulkan_renderer_ref_glyph_image (GskVulkanRenderer *self,
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GskVulkanUploader *uploader,
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guint index);
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GskVulkanCachedGlyph * gsk_vulkan_renderer_get_cached_glyph (GskVulkanRenderer *self,
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PangoFont *font,
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PangoGlyph glyph,
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int x,
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int y,
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float scale);
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G_END_DECLS
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